diff --git a/build.gradle b/build.gradle
index c8728c37..c0b6eea4 100644
--- a/build.gradle
+++ b/build.gradle
@@ -25,7 +25,7 @@ allprojects {
     repositories {
         jcenter()
         mavenCentral()
-        maven { url = "https://jitpack.io" }
+        //maven { url = "https://jitpack.io" }
         maven { url = "http://dl.bintray.com/kotlin/ktor" }
         maven { url = "https://dl.bintray.com/kotlin/kotlinx" }
     }
diff --git a/numass-core/src/main/kotlin/inr/numass/data/NumassDataUtils.kt b/numass-core/src/main/kotlin/inr/numass/data/NumassDataUtils.kt
index 066ef189..2ffbc2cf 100644
--- a/numass-core/src/main/kotlin/inr/numass/data/NumassDataUtils.kt
+++ b/numass-core/src/main/kotlin/inr/numass/data/NumassDataUtils.kt
@@ -3,15 +3,17 @@ package inr.numass.data
 import hep.dataforge.io.envelopes.Envelope
 import hep.dataforge.meta.Meta
 import hep.dataforge.meta.MetaBuilder
+import hep.dataforge.tables.Table
 import inr.numass.data.api.*
 import inr.numass.data.storage.ProtoBlock
+import kotlinx.coroutines.experimental.Deferred
 import java.io.ByteArrayInputStream
 import java.io.ByteArrayOutputStream
 import java.io.InputStream
 import java.util.stream.Collectors
-import java.util.stream.Stream
 import java.util.zip.Inflater
 import kotlin.streams.asSequence
+import kotlin.streams.toList
 
 
 /**
@@ -20,10 +22,14 @@ import kotlin.streams.asSequence
 object NumassDataUtils {
     fun join(setName: String, sets: Collection<NumassSet>): NumassSet {
         return object : NumassSet {
-            override val points: Stream<out NumassPoint> by lazy {
-                val points = sets.stream().flatMap<NumassPoint> { it.points }
+            override val hvData: Deferred<Table?>
+                get() = TODO("Join hv tables")
+
+            override val points: List<NumassPoint> by lazy {
+                val points = sets.stream().flatMap<NumassPoint> { it.points.stream() }
                         .collect(Collectors.groupingBy<NumassPoint, Double> { it.voltage })
                 points.entries.stream().map { entry -> SimpleNumassPoint(entry.value, entry.key) }
+                        .toList()
             }
 
             override val meta: Meta by lazy {
diff --git a/numass-core/src/main/kotlin/inr/numass/data/analyzers/NumassAnalyzer.kt b/numass-core/src/main/kotlin/inr/numass/data/analyzers/NumassAnalyzer.kt
index 7ee48558..2f8308be 100644
--- a/numass-core/src/main/kotlin/inr/numass/data/analyzers/NumassAnalyzer.kt
+++ b/numass-core/src/main/kotlin/inr/numass/data/analyzers/NumassAnalyzer.kt
@@ -95,11 +95,11 @@ interface NumassAnalyzer {
      * @param config
      * @return
      */
-    fun getLength(block: NumassBlock, config: Meta): Long {
+    fun getLength(block: NumassBlock, config: Meta = Meta.empty()): Long {
         return analyze(block, config).getValue(LENGTH_KEY).getNumber().toLong()
     }
 
-    fun getAmplitudeSpectrum(block: NumassBlock, config: Meta): Table {
+    fun getAmplitudeSpectrum(block: NumassBlock, config: Meta = Meta.empty()): Table {
         val seconds = block.length.toMillis().toDouble() / 1000.0
         return getAmplitudeSpectrum(getEvents(block, config).asSequence(), seconds, config)
     }
diff --git a/numass-core/src/main/kotlin/inr/numass/data/api/NumassPoint.kt b/numass-core/src/main/kotlin/inr/numass/data/api/NumassPoint.kt
index 1426f042..403e03e9 100644
--- a/numass-core/src/main/kotlin/inr/numass/data/api/NumassPoint.kt
+++ b/numass-core/src/main/kotlin/inr/numass/data/api/NumassPoint.kt
@@ -2,6 +2,8 @@ package inr.numass.data.api
 
 import hep.dataforge.io.envelopes.Envelope
 import hep.dataforge.meta.Metoid
+import hep.dataforge.providers.Provider
+import hep.dataforge.providers.Provides
 import inr.numass.data.channel
 import inr.numass.data.storage.ClassicNumassPoint
 import inr.numass.data.storage.ProtoNumassPoint
@@ -12,11 +14,40 @@ import java.util.stream.Stream
 /**
  * Created by darksnake on 06-Jul-17.
  */
-interface NumassPoint : Metoid, NumassBlock {
+interface NumassPoint : Metoid, NumassBlock, Provider {
 
 
     val blocks: List<NumassBlock>
 
+    /**
+     * Provides block with given number (starting with 0)
+     */
+    @Provides(NUMASS_BLOCK_TARGET)
+    operator fun get(index: Int): NumassBlock? {
+        return blocks[index]
+    }
+
+    /**
+     * Provides all blocks in given channel
+     */
+    @Provides(NUMASS_CHANNEL_TARGET)
+    fun channel(index: Int): NumassBlock? {
+        return channels[index]
+    }
+
+    /**
+     * Distinct map of channel number to corresponding grouping block
+     */
+    val channels: Map<Int, NumassBlock>
+        get() = blocks.toList().groupBy { it.channel }.mapValues { entry ->
+            if (entry.value.size == 1) {
+                entry.value.first()
+            } else {
+                MetaBlock(entry.value)
+            }
+        }
+
+
     /**
      * Get the voltage setting for the point
      *
@@ -77,6 +108,8 @@ interface NumassPoint : Metoid, NumassBlock {
         get() = blocks.stream().flatMap { it.frames }
 
     companion object {
+        const val NUMASS_BLOCK_TARGET = "block"
+        const val NUMASS_CHANNEL_TARGET = "channel"
 
         const val START_TIME_KEY = "start"
         const val LENGTH_KEY = "length"
diff --git a/numass-core/src/main/kotlin/inr/numass/data/api/NumassSet.kt b/numass-core/src/main/kotlin/inr/numass/data/api/NumassSet.kt
index 33155ba9..c26c9669 100644
--- a/numass-core/src/main/kotlin/inr/numass/data/api/NumassSet.kt
+++ b/numass-core/src/main/kotlin/inr/numass/data/api/NumassSet.kt
@@ -6,15 +6,15 @@
 package inr.numass.data.api
 
 import hep.dataforge.Named
-import hep.dataforge.kodex.toList
+import hep.dataforge.kodex.optional
 import hep.dataforge.meta.Metoid
 import hep.dataforge.providers.Provider
 import hep.dataforge.providers.Provides
 import hep.dataforge.providers.ProvidesNames
 import hep.dataforge.tables.Table
+import kotlinx.coroutines.experimental.Deferred
 import java.time.Instant
 import java.util.*
-import java.util.stream.Stream
 
 /**
  * A single set of numass points previously called file.
@@ -23,7 +23,7 @@ import java.util.stream.Stream
  */
 interface NumassSet : Named, Metoid, Iterable<NumassPoint>, Provider {
 
-    val points: Stream<out NumassPoint>
+    val points: List<NumassPoint>
 
     /**
      * Get the first point if it exists. Throw runtime exception otherwise.
@@ -31,7 +31,7 @@ interface NumassSet : Named, Metoid, Iterable<NumassPoint>, Provider {
      * @return
      */
     val firstPoint: NumassPoint
-        get() = points.findFirst().orElseThrow { RuntimeException("The set is empty") }
+        get() = points.firstOrNull() ?: throw RuntimeException("The set is empty")
 
     /**
      * Get the starting time from meta or from first point
@@ -39,14 +39,9 @@ interface NumassSet : Named, Metoid, Iterable<NumassPoint>, Provider {
      * @return
      */
     val startTime: Instant
-        get() = meta.optValue(NumassPoint.START_TIME_KEY).map<Instant>{ it.getTime() }.orElseGet { firstPoint.startTime }
+        get() = meta.optValue(NumassPoint.START_TIME_KEY).map<Instant> { it.time }.orElseGet { firstPoint.startTime }
 
-    val hvData: Optional<Table>
-        get() = Optional.empty()
-
-    //    default String getDescription() {
-    //        return getMeta().getString(DESCRIPTION_KEY, "");
-    //    }
+    val hvData: Deferred<Table?>
 
     override fun iterator(): Iterator<NumassPoint> {
         return points.iterator()
@@ -59,7 +54,7 @@ interface NumassSet : Named, Metoid, Iterable<NumassPoint>, Provider {
      * @return
      */
     fun optPoint(voltage: Double): Optional<out NumassPoint> {
-        return points.filter { it -> it.voltage == voltage }.findFirst()
+        return points.firstOrNull { it -> it.voltage == voltage }.optional
     }
 
     /**
@@ -82,7 +77,7 @@ interface NumassSet : Named, Metoid, Iterable<NumassPoint>, Provider {
     }
 
     @ProvidesNames(NUMASS_POINT_PROVIDER_KEY)
-    fun listPoints(): Stream<String> {
+    fun listPoints(): List<String> {
         return points.map { it -> java.lang.Double.toString(it.voltage) }
     }
 
diff --git a/numass-core/src/main/kotlin/inr/numass/data/legacy/NumassDatFile.kt b/numass-core/src/main/kotlin/inr/numass/data/legacy/NumassDatFile.kt
index 6f59b9cc..94dd469a 100644
--- a/numass-core/src/main/kotlin/inr/numass/data/legacy/NumassDatFile.kt
+++ b/numass-core/src/main/kotlin/inr/numass/data/legacy/NumassDatFile.kt
@@ -2,8 +2,11 @@ package inr.numass.data.legacy
 
 import hep.dataforge.meta.Meta
 import hep.dataforge.meta.MetaBuilder
+import hep.dataforge.tables.Table
 import inr.numass.data.api.*
 import inr.numass.data.api.NumassPoint.Companion.HV_KEY
+import kotlinx.coroutines.experimental.CompletableDeferred
+import kotlinx.coroutines.experimental.Deferred
 import org.apache.commons.io.FilenameUtils
 import java.io.IOException
 import java.nio.ByteBuffer
@@ -17,20 +20,21 @@ import java.time.LocalDateTime
 import java.time.ZoneOffset
 import java.time.format.DateTimeFormatter
 import java.util.*
-import java.util.stream.Stream
 
 /**
  * Created by darksnake on 08.07.2017.
  */
 class NumassDatFile @Throws(IOException::class)
 constructor(override val name: String, private val path: Path, meta: Meta) : NumassSet {
+    override val hvData: Deferred<Table?> = CompletableDeferred(null)
+
     override val meta: Meta
 
     private val hVdev: Double
         get() = meta.getDouble("dat.hvDev", 2.468555393226049)
 
     //TODO check point start
-    override val points: Stream<NumassPoint>
+    override val points: List<NumassPoint>
         get() = try {
             Files.newByteChannel(path, READ).use { channel ->
                 var lab: Int
@@ -39,7 +43,7 @@ constructor(override val name: String, private val path: Path, meta: Meta) : Num
                     points.add(readPoint(channel))
                     lab = readBlock(channel, 1).get().toInt()
                 } while (lab != 0xff)
-                return points.stream()
+                return points
             }
         } catch (ex: IOException) {
             throw RuntimeException(ex)
diff --git a/numass-core/src/main/kotlin/inr/numass/data/storage/NumassDataLoader.kt b/numass-core/src/main/kotlin/inr/numass/data/storage/NumassDataLoader.kt
index 049ec67e..038619e5 100644
--- a/numass-core/src/main/kotlin/inr/numass/data/storage/NumassDataLoader.kt
+++ b/numass-core/src/main/kotlin/inr/numass/data/storage/NumassDataLoader.kt
@@ -19,6 +19,7 @@ import hep.dataforge.context.Context
 import hep.dataforge.exceptions.StorageException
 import hep.dataforge.io.ColumnedDataReader
 import hep.dataforge.io.envelopes.Envelope
+import hep.dataforge.kodex.toList
 import hep.dataforge.meta.Meta
 import hep.dataforge.meta.MetaBuilder
 import hep.dataforge.providers.Provider
@@ -31,6 +32,9 @@ import hep.dataforge.tables.Table
 import inr.numass.data.api.NumassPoint
 import inr.numass.data.api.NumassSet
 import inr.numass.data.legacy.NumassFileEnvelope
+import kotlinx.coroutines.experimental.CoroutineStart
+import kotlinx.coroutines.experimental.Deferred
+import kotlinx.coroutines.experimental.async
 import org.slf4j.LoggerFactory
 import java.io.IOException
 import java.nio.file.Files
@@ -56,8 +60,8 @@ class NumassDataLoader(
 
     override val meta: Meta = items[META_FRAGMENT_NAME]?.get()?.meta ?: Meta.empty()
 
-    private val hvEnvelope: Optional<Envelope>
-        get() = Optional.ofNullable(items[HV_FRAGMENT_NAME]).map { it.get() }
+    private val hvEnvelope: Envelope?
+        get() = items[HV_FRAGMENT_NAME]?.get()
 
     private val pointEnvelopes: Stream<Envelope>
         get() = items.entries.stream()
@@ -77,22 +81,24 @@ class NumassDataLoader(
         return items.keys
     }
 
-    override val hvData: Optional<Table>
-        get() = hvEnvelope.map { hvEnvelope ->
-            try {
-                ColumnedDataReader(hvEnvelope.data.stream, "timestamp", "block", "value").toTable()
-            } catch (ex: IOException) {
-                LoggerFactory.getLogger(javaClass).error("Failed to load HV data from file", ex)
-                null
+    override val hvData: Deferred<Table?>
+        get() = async(start = CoroutineStart.LAZY) {
+            hvEnvelope?.let { hvEnvelope ->
+                try {
+                    ColumnedDataReader(hvEnvelope.data.stream, "timestamp", "block", "value").toTable()
+                } catch (ex: IOException) {
+                    LoggerFactory.getLogger(javaClass).error("Failed to load HV data from file", ex)
+                    null
+                }
             }
         }
 
 
-    override val points: Stream<NumassPoint>
+    override val points: List<NumassPoint>
         get() {
             return pointEnvelopes.map {
                 NumassPoint.read(it)
-            }
+            }.toList()
         }
 
     override fun pull(fragmentName: String): Envelope {
@@ -203,5 +209,6 @@ class NumassDataLoader(
          */
         val HV_FRAGMENT_NAME = "voltage"
     }
-
 }
+
+
diff --git a/numass-core/src/main/kotlin/inr/numass/data/storage/ProtoNumassPoint.kt b/numass-core/src/main/kotlin/inr/numass/data/storage/ProtoNumassPoint.kt
index 7e3741ee..7eafeef6 100644
--- a/numass-core/src/main/kotlin/inr/numass/data/storage/ProtoNumassPoint.kt
+++ b/numass-core/src/main/kotlin/inr/numass/data/storage/ProtoNumassPoint.kt
@@ -6,17 +6,13 @@ import hep.dataforge.io.envelopes.Envelope
 import hep.dataforge.kodex.toList
 import hep.dataforge.meta.Meta
 import inr.numass.data.NumassProto
-import inr.numass.data.api.NumassBlock
-import inr.numass.data.api.NumassEvent
-import inr.numass.data.api.NumassFrame
-import inr.numass.data.api.NumassPoint
+import inr.numass.data.api.*
 import inr.numass.data.dataStream
 import inr.numass.data.legacy.NumassFileEnvelope
 import org.slf4j.LoggerFactory
 import java.nio.file.Path
 import java.time.Duration
 import java.time.Instant
-import java.util.*
 import java.util.stream.IntStream
 import java.util.stream.Stream
 
@@ -24,18 +20,23 @@ import java.util.stream.Stream
  * Protobuf based numass point
  * Created by darksnake on 09.07.2017.
  */
-class ProtoNumassPoint(override val meta: Meta, protoBuilder: () -> NumassProto.Point) : NumassPoint {
+class ProtoNumassPoint(override val meta: Meta, val protoBuilder: () -> NumassProto.Point) : NumassPoint {
 
-    val proto: NumassProto.Point by lazy(protoBuilder)
+    val proto: NumassProto.Point
+        get() = protoBuilder()
 
-    override val blocks: List<NumassBlock> by lazy {
-        proto.channelsList.stream()
+    override val blocks: List<NumassBlock>
+        get() = proto.channelsList
                 .flatMap { channel ->
-                    channel.blocksList.stream()
+                    channel.blocksList
                             .map { block -> ProtoBlock(channel.id.toInt(), block, this) }
-                            .sorted(Comparator.comparing<ProtoBlock, Instant> { it.startTime })
-                }.toList()
-    }
+                            .sortedBy { it.startTime }
+                }
+
+    override val channels: Map<Int, NumassBlock>
+        get() = proto.channelsList.groupBy { it.id.toInt() }.mapValues { entry ->
+            MetaBlock(entry.value.flatMap { it.blocksList }.map { ProtoBlock(entry.key, it, this) })
+        }
 
     override val voltage: Double = meta.getDouble("external_meta.HV1_value", super.voltage)
 
@@ -62,7 +63,7 @@ class ProtoNumassPoint(override val meta: Meta, protoBuilder: () -> NumassProto.
         }
 
         fun fromEnvelope(envelope: Envelope): ProtoNumassPoint {
-            return ProtoNumassPoint(envelope.meta){
+            return ProtoNumassPoint(envelope.meta) {
                 envelope.dataStream.use {
                     NumassProto.Point.parseFrom(it)
                 }
diff --git a/numass-core/src/main/proto/inr/numas/numass-proto.proto b/numass-core/src/main/proto/inr/numas/numass-proto.proto
index bafb68c6..6ce6f065 100644
--- a/numass-core/src/main/proto/inr/numas/numass-proto.proto
+++ b/numass-core/src/main/proto/inr/numas/numass-proto.proto
@@ -12,10 +12,9 @@ message Point {
                 uint64 time = 1; // Time in nanos from the beginning of the block
                 bytes data = 2; // Frame data as an array of int16 mesured in arbitrary channels
             }
-            // Обработанные события. Содержат только время и амплитуду сигналов.
-            // Для экономии места при сериализации амплитуды и времена лежат в
-            // разных массивах. Амплитуда и время имеющие одинаковые индексы
-            // соответствуют одному событию
+            // Event block obtained directly from  device of from frame analysis
+            // In order to save space, times and amplitudes are in separate arrays.
+            // Amplitude and time with the same index correspond to the same event
             message Events {
                 repeated uint64 times = 1; // Array of time in nanos from the beginning of the block
                 repeated uint64 amplitudes = 2; // Array of amplitudes of events in channels
@@ -24,8 +23,8 @@ message Point {
             uint64 time = 1; // Block start in epoch nanos
             repeated Frame frames = 2; // Frames array
             Events events = 3; // Events array
-            uint64 length = 4; // block size in nanos
-            uint64 bin_size = 5;  // tick size in nanos
+            uint64 length = 4; // block size in nanos. If missing, take from meta.
+            uint64 bin_size = 5;  // tick size in nanos. Obsolete, to be removed
         }
         uint64 id = 1; // The number of measuring channel
         repeated Block blocks = 2; // Blocks
diff --git a/numass-viewer/src/main/kotlin/inr/numass/viewer/AmplitudeView.kt b/numass-viewer/src/main/kotlin/inr/numass/viewer/AmplitudeView.kt
index d80d28cc..d6ef3138 100644
--- a/numass-viewer/src/main/kotlin/inr/numass/viewer/AmplitudeView.kt
+++ b/numass-viewer/src/main/kotlin/inr/numass/viewer/AmplitudeView.kt
@@ -6,7 +6,6 @@ import hep.dataforge.fx.runGoal
 import hep.dataforge.fx.ui
 import hep.dataforge.goals.Goal
 import hep.dataforge.kodex.configure
-import hep.dataforge.kodex.toList
 import hep.dataforge.plots.PlotFrame
 import hep.dataforge.plots.PlotGroup
 import hep.dataforge.plots.Plottable
@@ -15,10 +14,6 @@ import hep.dataforge.plots.jfreechart.JFreeChartFrame
 import hep.dataforge.tables.Adapters
 import inr.numass.data.analyzers.NumassAnalyzer
 import inr.numass.data.analyzers.withBinning
-import inr.numass.data.api.MetaBlock
-import inr.numass.data.api.NumassBlock
-import inr.numass.data.api.NumassPoint
-import inr.numass.data.channel
 import javafx.beans.Observable
 import javafx.beans.binding.DoubleBinding
 import javafx.beans.property.SimpleBooleanProperty
@@ -74,7 +69,7 @@ class AmplitudeView : View(title = "Numass amplitude spectrum plot", icon = Imag
         addToSideBar(0, binningSelector, normalizeSwitch)
     }
 
-    private val data: ObservableMap<String, NumassPoint> = FXCollections.observableHashMap()
+    private val data: ObservableMap<String, CachedPoint> = FXCollections.observableHashMap()
     private val plots: ObservableMap<String, Goal<Plottable>> = FXCollections.observableHashMap()
 
     val isEmpty = booleanBinding(data) { data.isEmpty() }
@@ -112,27 +107,14 @@ class AmplitudeView : View(title = "Numass amplitude spectrum plot", icon = Imag
     /**
      * Put or replace current plot with name `key`
      */
-    fun add(key: String, point: NumassPoint) {
+    fun add(key: String, point: CachedPoint) {
         data[key] = point
     }
 
-    fun addAll(data: Map<String, NumassPoint>) {
+    fun addAll(data: Map<String, CachedPoint>) {
         this.data.putAll(data);
     }
 
-    /**
-     * Distinct map of channel number to corresponding grouping block
-     */
-    private fun NumassPoint.getChannels(): Map<Int, NumassBlock> {
-        return blocks.toList().groupBy { it.channel }.mapValues { entry ->
-            if (entry.value.size == 1) {
-                entry.value.first()
-            } else {
-                MetaBlock(entry.value)
-            }
-        }
-    }
-
     private fun invalidate() {
         data.forEach { key, point ->
             plots.computeIfAbsent(key) {
@@ -144,21 +126,21 @@ class AmplitudeView : View(title = "Numass amplitude spectrum plot", icon = Imag
                     }
                     val adapter = Adapters.buildXYAdapter(NumassAnalyzer.CHANNEL_KEY, valueAxis)
 
-                    val channels = point.getChannels()
+                    val channels = point.channelSpectra.await()
 
                     return@runGoal if (channels.size == 1) {
                         DataPlot.plot(
                                 key,
                                 adapter,
-                                PointCache[point].withBinning(binning)
+                                channels.values.first().withBinning(binning)
                         )
                     } else {
                         val group = PlotGroup.typed<DataPlot>(key)
-                        channels.forEach { key, block ->
+                        channels.forEach { key, spectrum ->
                             val plot = DataPlot.plot(
                                     key.toString(),
                                     adapter,
-                                    PointCache[block].withBinning(binning)
+                                    spectrum.withBinning(binning)
                             )
                             group.add(plot)
                         }
@@ -192,7 +174,7 @@ class AmplitudeView : View(title = "Numass amplitude spectrum plot", icon = Imag
     /**
      * Set frame content to the given map. All keys not in the map are removed.
      */
-    fun setAll(map: Map<String, NumassPoint>) {
+    fun setAll(map: Map<String, CachedPoint>) {
         plots.clear();
         //Remove obsolete keys
         data.keys.filter { !map.containsKey(it) }.forEach {
diff --git a/numass-viewer/src/main/kotlin/inr/numass/viewer/Cache.kt b/numass-viewer/src/main/kotlin/inr/numass/viewer/Cache.kt
new file mode 100644
index 00000000..646d46ca
--- /dev/null
+++ b/numass-viewer/src/main/kotlin/inr/numass/viewer/Cache.kt
@@ -0,0 +1,51 @@
+/*
+ * Copyright  2018 Alexander Nozik.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+
+package inr.numass.viewer
+
+import hep.dataforge.meta.Meta
+import hep.dataforge.tables.Table
+import inr.numass.data.analyzers.SimpleAnalyzer
+import inr.numass.data.api.NumassBlock
+import inr.numass.data.api.NumassPoint
+import inr.numass.data.api.NumassSet
+import kotlinx.coroutines.experimental.CoroutineStart
+import kotlinx.coroutines.experimental.Deferred
+import kotlinx.coroutines.experimental.async
+
+private val analyzer = SimpleAnalyzer()
+
+
+class CachedPoint(point: NumassPoint) : NumassPoint by point {
+    private val lazyBlocks: () -> List<NumassBlock> = { point.blocks }
+
+    override val blocks: List<NumassBlock>
+        get() = lazyBlocks()
+
+    override val meta: Meta = point.meta
+
+    val channelSpectra: Deferred<Map<Int, Table>> = async(start = CoroutineStart.LAZY) {
+        return@async point.channels.mapValues { (_, value) -> analyzer.getAmplitudeSpectrum(value) }
+    }
+
+    val spectrum: Deferred<Table> = async(start = CoroutineStart.LAZY) {
+        analyzer.getAmplitudeSpectrum(point)
+    }
+}
+
+class CachedSet(set: NumassSet) : NumassSet by set {
+    override val points: List<CachedPoint> = set.points.map { CachedPoint(it) }
+}
diff --git a/numass-viewer/src/main/kotlin/inr/numass/viewer/HVView.kt b/numass-viewer/src/main/kotlin/inr/numass/viewer/HVView.kt
index b33bae4f..97141f3e 100644
--- a/numass-viewer/src/main/kotlin/inr/numass/viewer/HVView.kt
+++ b/numass-viewer/src/main/kotlin/inr/numass/viewer/HVView.kt
@@ -53,9 +53,9 @@ class HVView : View(title = "High voltage time plot", icon = ImageView(dfIcon))
             if (change.wasAdded()) {
                 runLater { container.progress = -1.0 }
                 runGoal("hvData[${change.key}]") {
-                    change.valueAdded.hvData
+                    change.valueAdded.hvData.await()
                 } ui { hvData ->
-                    hvData.ifPresent {
+                    hvData?.let {
                         for (dp in it) {
                             val plot: TimePlot = frame[change.key] as TimePlot? ?: TimePlot(change.key).apply { frame.add(this) }
                             plot.put(dp.getValue("timestamp").getTime(), dp.getValue("value"))
diff --git a/numass-viewer/src/main/kotlin/inr/numass/viewer/MainView.kt b/numass-viewer/src/main/kotlin/inr/numass/viewer/MainView.kt
index b474487a..4ddb63e4 100644
--- a/numass-viewer/src/main/kotlin/inr/numass/viewer/MainView.kt
+++ b/numass-viewer/src/main/kotlin/inr/numass/viewer/MainView.kt
@@ -144,7 +144,7 @@ class MainView(val context: Context = Global.getContext("viewer")) : View(title
                     NumassDataLoader.fromDir(context, path)
                 } ui {
                     contentView = SpectrumView().apply {
-                        add(it.name, it)
+                        set(it.name, CachedSet(it))
                     }
                     infoView = MetaViewer(it.meta)
                 } except {
@@ -195,9 +195,9 @@ class MainView(val context: Context = Global.getContext("viewer")) : View(title
                     val point = NumassPoint.read(it)
                     runLater {
                         contentView = AmplitudeView().apply {
-                            add(path.toString(), point)
+                            add(path.toString(), CachedPoint(point))
                         }
-                        infoView = PointInfoView(point)
+                        infoView = PointInfoView(CachedPoint(point))
                     }
                 } else {
                     alert(
diff --git a/numass-viewer/src/main/kotlin/inr/numass/viewer/NumassDataCache.kt b/numass-viewer/src/main/kotlin/inr/numass/viewer/NumassDataCache.kt
deleted file mode 100644
index 0fbe211e..00000000
--- a/numass-viewer/src/main/kotlin/inr/numass/viewer/NumassDataCache.kt
+++ /dev/null
@@ -1,26 +0,0 @@
-package inr.numass.viewer
-
-import hep.dataforge.meta.Meta
-import hep.dataforge.tables.Table
-import inr.numass.data.api.NumassPoint
-import inr.numass.data.api.NumassSet
-import java.util.*
-import java.util.stream.Collectors
-import java.util.stream.Stream
-
-/**
- * Cached numass data
- * Created by darksnake on 23-Jun-17.
- */
-class NumassDataCache(private val data: NumassSet) : NumassSet {
-    //private val cachedDescription: String by lazy { data.description }
-    override val meta: Meta by lazy { data.meta }
-    private val cachedPoints: List<NumassPoint> by lazy { data.points.collect(Collectors.toList()) }
-    override val hvData: Optional<Table> by lazy { data.hvData }
-
-
-    override val points: Stream<NumassPoint>
-        get() = cachedPoints.stream()
-
-    override val name: String = data.name
-}
\ No newline at end of file
diff --git a/numass-viewer/src/main/kotlin/inr/numass/viewer/PointInfoView.kt b/numass-viewer/src/main/kotlin/inr/numass/viewer/PointInfoView.kt
index 9c6680fd..b6fbb41e 100644
--- a/numass-viewer/src/main/kotlin/inr/numass/viewer/PointInfoView.kt
+++ b/numass-viewer/src/main/kotlin/inr/numass/viewer/PointInfoView.kt
@@ -2,13 +2,15 @@ package inr.numass.viewer
 
 import hep.dataforge.fx.meta.MetaViewer
 import inr.numass.data.analyzers.NumassAnalyzer
-import inr.numass.data.api.NumassPoint
+import kotlinx.coroutines.experimental.runBlocking
 import tornadofx.*
 import tornadofx.controlsfx.borders
 
-class PointInfoView(val point: NumassPoint) : MetaViewer(point.meta) {
+class PointInfoView(val point: CachedPoint) : MetaViewer(point.meta) {
     private val count: Int by lazy {
-        PointCache[point].sumBy { it.getValue(NumassAnalyzer.COUNT_KEY).int }
+        runBlocking {
+            point.spectrum.await().sumBy { it.getValue(NumassAnalyzer.COUNT_KEY).int }
+        }
     }
 
     override val root = super.root.apply {
diff --git a/numass-viewer/src/main/kotlin/inr/numass/viewer/SpectrumView.kt b/numass-viewer/src/main/kotlin/inr/numass/viewer/SpectrumView.kt
index 1383f470..7a974b5a 100644
--- a/numass-viewer/src/main/kotlin/inr/numass/viewer/SpectrumView.kt
+++ b/numass-viewer/src/main/kotlin/inr/numass/viewer/SpectrumView.kt
@@ -22,7 +22,6 @@ import javafx.util.converter.NumberStringConverter
 import org.controlsfx.control.RangeSlider
 import tornadofx.*
 import java.util.concurrent.atomic.AtomicInteger
-import java.util.stream.Collectors
 
 /**
  * View for energy spectrum
@@ -52,7 +51,7 @@ class SpectrumView : View(title = "Numass spectrum plot", icon = ImageView(dfIco
     private var upChannel by upChannelProperty
 
 
-    private val data: ObservableMap<String, NumassSet> = FXCollections.observableHashMap();
+    private val data: ObservableMap<String, CachedSet> = FXCollections.observableHashMap();
     val isEmpty = booleanBinding(data) { data.isEmpty() }
 
     override val root = borderpane {
@@ -113,24 +112,24 @@ class SpectrumView : View(title = "Numass spectrum plot", icon = ImageView(dfIco
     private fun updateView() {
         runLater { container.progress = 0.0 }
         val progress = AtomicInteger(0)
-        val totalProgress = data.values.stream().mapToLong() { it.points.count() }.sum()
+        val totalProgress = data.values.stream().mapToInt { it.points.size }.sum()
 
         data.forEach { name, set ->
             val plot: DataPlot = frame[name] as DataPlot? ?: DataPlot(name).apply { frame.add(this) }
 
             runGoal("spectrumData[$name]") {
                 set.points.map { point ->
-                    val count = PointCache[point].countInWindow(loChannel.toShort(), upChannel.toShort());
+                    val count = point.spectrum.await().countInWindow(loChannel.toShort(), upChannel.toShort());
                     val seconds = point.length.toMillis() / 1000.0;
                     runLater {
-                        container.progress = progress.incrementAndGet().toDouble() / totalProgress
+                         container.progress = progress.incrementAndGet().toDouble() / totalProgress
                     }
                     Adapters.buildXYDataPoint(
                             point.voltage,
                             (count / seconds),
                             Math.sqrt(count.toDouble()) / seconds
                     )
-                }.collect(Collectors.toList())
+                }
             } ui { points ->
                 plot.fillData(points)
                 container.progress = 1.0
@@ -139,8 +138,8 @@ class SpectrumView : View(title = "Numass spectrum plot", icon = ImageView(dfIco
         }
     }
 
-    fun add(key: String, value: NumassSet) {
-        data[key] = NumassDataCache(value)
+    operator fun set(key: String, value: CachedSet) {
+        data[key] = value
     }
 
     fun remove(key: String) {
diff --git a/numass-viewer/src/main/kotlin/inr/numass/viewer/StorageView.kt b/numass-viewer/src/main/kotlin/inr/numass/viewer/StorageView.kt
index e9fa1555..7c068b09 100644
--- a/numass-viewer/src/main/kotlin/inr/numass/viewer/StorageView.kt
+++ b/numass-viewer/src/main/kotlin/inr/numass/viewer/StorageView.kt
@@ -14,7 +14,6 @@ import javafx.beans.property.SimpleBooleanProperty
 import javafx.scene.control.ContextMenu
 import javafx.scene.control.TreeItem
 import tornadofx.*
-import kotlin.streams.toList
 
 class StorageView(val storage: Storage) : View(title = "Numass storage", icon = dfIconView) {
 
@@ -29,7 +28,7 @@ class StorageView(val storage: Storage) : View(title = "Numass storage", icon =
 
         val infoView: UIComponent? by lazy {
             when (content) {
-                is NumassPoint -> PointInfoView(content)
+                is CachedPoint -> PointInfoView(content)
                 is Metoid -> MetaViewer(content.meta, title = "Meta view: $id")
                 else -> null
             }
@@ -38,16 +37,16 @@ class StorageView(val storage: Storage) : View(title = "Numass storage", icon =
         init {
             checkedProperty.onChange { selected ->
                 when (content) {
-                    is NumassPoint -> {
+                    is CachedPoint -> {
                         if (selected) {
                             ampView.add(id, content)
                         } else {
                             ampView.remove(id)
                         }
                     }
-                    is NumassSet -> {
+                    is CachedSet -> {
                         if (selected) {
-                            spectrumView.add(id, content)
+                            spectrumView.set(id, content)
                             hvView.add(id, content)
                         } else {
                             spectrumView.remove(id)
@@ -68,8 +67,8 @@ class StorageView(val storage: Storage) : View(title = "Numass storage", icon =
         val children: List<Container>? by lazy {
             when (content) {
                 is Storage -> (content.shelves().sorted() + content.loaders().sorted()).map { buildContainer(it, this) }
-                is NumassSet -> content.points
-                        .sorted(compareBy { it.index })
+                is CachedSet -> content.points
+                        .sortedBy { it.index }
                         .map { buildContainer(it, this) }
                         .toList()
                 else -> null
@@ -179,10 +178,10 @@ class StorageView(val storage: Storage) : View(title = "Numass storage", icon =
                     } else {
                         content.name
                     }
-                    Container(id, content)
+                    Container(id, content as? CachedSet ?: CachedSet(content))
                 }
                 is NumassPoint -> {
-                    Container("${parent.id}/${content.voltage}[${content.index}]", content)
+                    Container("${parent.id}/${content.voltage}[${content.index}]", content as? CachedPoint ?: CachedPoint(content))
                 }
                 is Loader -> {
                     Container(content.path.toString(), content);
diff --git a/numass-viewer/src/main/kotlin/inr/numass/viewer/Viewer.kt b/numass-viewer/src/main/kotlin/inr/numass/viewer/Viewer.kt
index 6b9dfe60..33a5da02 100644
--- a/numass-viewer/src/main/kotlin/inr/numass/viewer/Viewer.kt
+++ b/numass-viewer/src/main/kotlin/inr/numass/viewer/Viewer.kt
@@ -4,11 +4,6 @@ import ch.qos.logback.classic.Level
 import ch.qos.logback.classic.Logger
 import hep.dataforge.context.Global
 import hep.dataforge.fx.dfIcon
-import hep.dataforge.meta.Meta
-import hep.dataforge.tables.Table
-import hep.dataforge.utils.Misc
-import inr.numass.data.analyzers.SimpleAnalyzer
-import inr.numass.data.api.NumassBlock
 import javafx.stage.Stage
 import org.slf4j.LoggerFactory
 import tornadofx.*
@@ -17,7 +12,7 @@ import tornadofx.*
  * Created by darksnake on 14-Apr-17.
  */
 class Viewer : App(MainView::class) {
-    init{
+    init {
         (LoggerFactory.getLogger(Logger.ROOT_LOGGER_NAME) as Logger).level = Level.INFO
     }
 
@@ -30,16 +25,4 @@ class Viewer : App(MainView::class) {
         super.stop()
         Global.terminate();
     }
-}
-
-/**
- * Global point cache
- */
-object PointCache{
-    private val analyzer = SimpleAnalyzer()
-    private val cache: MutableMap<NumassBlock, Table> = Misc.getLRUCache(1000)
-
-    operator fun get(point: NumassBlock): Table {
-        return cache.computeIfAbsent(point) { analyzer.getAmplitudeSpectrum(point, Meta.empty()) }
-    }
 }
\ No newline at end of file
diff --git a/numass-viewer/src/main/kotlin/inr/numass/viewer/test/ComponentTest.kt b/numass-viewer/src/main/kotlin/inr/numass/viewer/test/ComponentTest.kt
index a93d233b..1efc6285 100644
--- a/numass-viewer/src/main/kotlin/inr/numass/viewer/test/ComponentTest.kt
+++ b/numass-viewer/src/main/kotlin/inr/numass/viewer/test/ComponentTest.kt
@@ -6,14 +6,11 @@ import hep.dataforge.tables.Table
 import inr.numass.data.api.NumassPoint
 import inr.numass.data.api.NumassSet
 import inr.numass.data.storage.NumassStorageFactory
-import inr.numass.viewer.AmplitudeView
-import inr.numass.viewer.HVView
-import inr.numass.viewer.SpectrumView
+import inr.numass.viewer.*
 import javafx.application.Application
 import javafx.scene.image.ImageView
 import tornadofx.*
 import java.util.concurrent.ConcurrentHashMap
-import java.util.stream.Collectors
 
 class ViewerComponentsTestApp : App(ViewerComponentsTest::class)
 
@@ -53,8 +50,8 @@ class ViewerComponentsTest : View(title = "Numass viewer test", icon = ImageView
     }
 
     fun update(set: NumassSet) {
-        amp.setAll(set.points.filter { it.voltage != 16000.0 }.collect(Collectors.toMap({ "point_${it.voltage}" }, { it })));
-        sp.add("test", set);
+        amp.setAll(set.points.filter { it.voltage != 16000.0 }.associateBy({ "point_${it.voltage}" }) { CachedPoint(it) });
+        sp.set("test", CachedSet(set));
         hv.add(set.name, set)
     }
 }