diff --git a/dataforge-io/dataforge-io-yaml/src/main/kotlin/hep/dataforge/io/yaml/FrontMatterEnvelopeFormat.kt b/dataforge-io/dataforge-io-yaml/src/main/kotlin/hep/dataforge/io/yaml/FrontMatterEnvelopeFormat.kt
index be6e1d75..be74d080 100644
--- a/dataforge-io/dataforge-io-yaml/src/main/kotlin/hep/dataforge/io/yaml/FrontMatterEnvelopeFormat.kt
+++ b/dataforge-io/dataforge-io-yaml/src/main/kotlin/hep/dataforge/io/yaml/FrontMatterEnvelopeFormat.kt
@@ -5,8 +5,10 @@ import hep.dataforge.io.*
 import hep.dataforge.meta.DFExperimental
 import hep.dataforge.meta.EmptyMeta
 import hep.dataforge.meta.Meta
-import kotlinx.io.Input
-import kotlinx.io.Output
+import kotlinx.io.*
+import kotlinx.io.text.readUtf8Line
+import kotlinx.io.text.writeRawString
+import kotlinx.io.text.writeUtf8String
 import kotlinx.serialization.toUtf8Bytes
 
 @DFExperimental
@@ -27,14 +29,17 @@ class FrontMatterEnvelopeFormat(
             metaTypeRegex.matchEntire(line)?.groupValues?.first()
                 ?.let { io.metaFormat(it) } ?: YamlMetaFormat
 
-        val metaBlock = buildPacket {
+        val meta = buildBytes {
             do {
-                line = readUtf8Line() ?: error("Input does not contain closing front matter separator")
-                appendln(line)
+                line = readUtf8Line()
+                writeUtf8String(line + "\r\n")
                 offset += line.toUtf8Bytes().size.toUInt()
             } while (!line.startsWith(SEPARATOR))
+        }.read {
+            readMetaFormat.run {
+                readMeta()
+            }
         }
-        val meta = readMetaFormat.fromBytes(metaBlock)
         return PartialEnvelope(meta, offset, null)
     }
 
@@ -48,23 +53,29 @@ class FrontMatterEnvelopeFormat(
             metaTypeRegex.matchEntire(line)?.groupValues?.first()
                 ?.let { io.metaFormat(it) } ?: YamlMetaFormat
 
-        val metaBlock = buildPacket {
+        val meta = buildBytes {
             do {
-                appendln(readUtf8Line() ?: error("Input does not contain closing front matter separator"))
+                writeUtf8String(readUtf8Line()  + "\r\n")
             } while (!line.startsWith(SEPARATOR))
+        }.read {
+            readMetaFormat.run {
+                readMeta()
+            }
         }
-        val meta = readMetaFormat.fromBytes(metaBlock)
-        val bytes = readBytes()
+        val bytes = readRemaining()
         val data = bytes.asBinary()
         return SimpleEnvelope(meta, data)
     }
 
     override fun Output.writeEnvelope(envelope: Envelope, metaFormatFactory: MetaFormatFactory, formatMeta: Meta) {
         val metaFormat = metaFormatFactory(formatMeta, io.context)
-        writeText("$SEPARATOR\r\n")
+        writeRawString("$SEPARATOR\r\n")
         metaFormat.run { writeObject(envelope.meta) }
-        writeText("$SEPARATOR\r\n")
-        envelope.data?.read { copyTo(this@writeEnvelope) }
+        writeRawString("$SEPARATOR\r\n")
+        //Printing data
+        envelope.data?.let { data ->
+            writeBinary(data)
+        }
     }
 
     companion object : EnvelopeFormatFactory {
@@ -77,7 +88,7 @@ class FrontMatterEnvelopeFormat(
         }
 
         override fun peekFormat(io: IOPlugin, input: Input): EnvelopeFormat? {
-            val line = input.readUtf8Line(3, 30)
+            val line = input.readUtf8Line()
             return if (line != null && line.startsWith("---")) {
                 invoke()
             } else {
diff --git a/dataforge-io/dataforge-io-yaml/src/main/kotlin/hep/dataforge/io/yaml/YamlMetaFormat.kt b/dataforge-io/dataforge-io-yaml/src/main/kotlin/hep/dataforge/io/yaml/YamlMetaFormat.kt
index 5e31a69e..acd19652 100644
--- a/dataforge-io/dataforge-io-yaml/src/main/kotlin/hep/dataforge/io/yaml/YamlMetaFormat.kt
+++ b/dataforge-io/dataforge-io-yaml/src/main/kotlin/hep/dataforge/io/yaml/YamlMetaFormat.kt
@@ -11,13 +11,13 @@ import hep.dataforge.meta.toMeta
 import kotlinx.io.Input
 import kotlinx.io.Output
 import kotlinx.io.readUByte
-import kotlinx.io.writeText
+import kotlinx.io.text.writeUtf8String
 import org.yaml.snakeyaml.Yaml
 import java.io.InputStream
 
 private class InputAsStream(val input: Input) : InputStream() {
     override fun read(): Int {
-        if (input.endOfInput) return -1
+        if (input.eof()) return -1
         return input.readUByte().toInt()
     }
 
@@ -34,7 +34,7 @@ class YamlMetaFormat(val meta: Meta) : MetaFormat {
 
     override fun Output.writeMeta(meta: Meta, descriptor: NodeDescriptor?) {
         val string = yaml.dump(meta.toMap(descriptor))
-        writeText(string)
+        writeUtf8String(string)
     }
 
     override fun Input.readMeta(descriptor: NodeDescriptor?): Meta {
diff --git a/dataforge-io/dataforge-io-yaml/src/test/kotlin/hep/dataforge/io/yaml/YamlMetaFormatTest.kt b/dataforge-io/dataforge-io-yaml/src/test/kotlin/hep/dataforge/io/yaml/YamlMetaFormatTest.kt
index 5c5b3c18..2be83509 100644
--- a/dataforge-io/dataforge-io-yaml/src/test/kotlin/hep/dataforge/io/yaml/YamlMetaFormatTest.kt
+++ b/dataforge-io/dataforge-io-yaml/src/test/kotlin/hep/dataforge/io/yaml/YamlMetaFormatTest.kt
@@ -6,7 +6,7 @@ import hep.dataforge.meta.Meta
 import hep.dataforge.meta.buildMeta
 import hep.dataforge.meta.get
 import hep.dataforge.meta.seal
-import org.junit.jupiter.api.Test
+import kotlin.test.Test
 import kotlin.test.assertEquals
 
 
diff --git a/dataforge-output-html/src/commonMain/kotlin/hep/dataforge/output/html/HtmlOutput.kt b/dataforge-output-html/src/commonMain/kotlin/hep/dataforge/output/html/HtmlRenderer.kt
similarity index 86%
rename from dataforge-output-html/src/commonMain/kotlin/hep/dataforge/output/html/HtmlOutput.kt
rename to dataforge-output-html/src/commonMain/kotlin/hep/dataforge/output/html/HtmlRenderer.kt
index 3ff23403..c0aeaaab 100644
--- a/dataforge-output-html/src/commonMain/kotlin/hep/dataforge/output/html/HtmlOutput.kt
+++ b/dataforge-output-html/src/commonMain/kotlin/hep/dataforge/output/html/HtmlRenderer.kt
@@ -3,7 +3,8 @@ package hep.dataforge.output.html
 import hep.dataforge.context.Context
 import hep.dataforge.meta.Meta
 import hep.dataforge.output.Output
-import hep.dataforge.output.TextRenderer
+import hep.dataforge.output.Renderer
+import hep.dataforge.output.TextFormat
 import hep.dataforge.output.html.HtmlBuilder.Companion.HTML_CONVERTER_TYPE
 import hep.dataforge.provider.Type
 import hep.dataforge.provider.top
@@ -14,11 +15,11 @@ import kotlinx.html.p
 import kotlin.reflect.KClass
 
 
-class HtmlOutput<T : Any>(override val context: Context, private val consumer: TagConsumer<*>) : Output<T> {
+class HtmlRenderer<T : Any>(override val context: Context, private val consumer: TagConsumer<*>) : Renderer<T> {
     private val cache = HashMap<KClass<*>, HtmlBuilder<*>>()
 
     /**
-     * Find the first [TextRenderer] matching the given object type.
+     * Find the first [TextFormat] matching the given object type.
      */
     override fun render(obj: T, meta: Meta) {
 
@@ -47,7 +48,7 @@ class HtmlOutput<T : Any>(override val context: Context, private val consumer: T
 }
 
 /**
- * A text or binary renderer based on [Output]
+ * A text or binary renderer based on [Renderer]
  */
 @Type(HTML_CONVERTER_TYPE)
 interface HtmlBuilder<T : Any> {
diff --git a/dataforge-output/src/commonMain/kotlin/hep/dataforge/output/OutputManager.kt b/dataforge-output/src/commonMain/kotlin/hep/dataforge/output/OutputManager.kt
index d9f7c1b2..c05d5bb4 100644
--- a/dataforge-output/src/commonMain/kotlin/hep/dataforge/output/OutputManager.kt
+++ b/dataforge-output/src/commonMain/kotlin/hep/dataforge/output/OutputManager.kt
@@ -1,9 +1,6 @@
 package hep.dataforge.output
 
-import hep.dataforge.context.AbstractPlugin
-import hep.dataforge.context.Context
-import hep.dataforge.context.PluginFactory
-import hep.dataforge.context.PluginTag
+import hep.dataforge.context.*
 import hep.dataforge.context.PluginTag.Companion.DATAFORGE_GROUP
 import hep.dataforge.meta.EmptyMeta
 import hep.dataforge.meta.Meta
@@ -22,14 +19,14 @@ interface OutputManager {
      * Get an output specialized for given type, name and stage.
      * @param stage represents the node or directory for the output. Empty means root node.
      * @param name represents the name inside the node.
-     * @param meta configuration for [Output] (not for rendered object)
+     * @param meta configuration for [Renderer] (not for rendered object)
      */
     operator fun <T : Any> get(
         type: KClass<out T>,
         name: Name,
         stage: Name = EmptyName,
         meta: Meta = EmptyMeta
-    ): Output<T>
+    ): Renderer<T>
 }
 
 /**
@@ -44,7 +41,7 @@ inline operator fun <reified T : Any> OutputManager.get(
     name: Name,
     stage: Name = EmptyName,
     meta: Meta = EmptyMeta
-): Output<T> {
+): Renderer<T> {
     return get(T::class, name, stage, meta)
 }
 
@@ -56,14 +53,21 @@ fun OutputManager.render(obj: Any, name: Name, stage: Name = EmptyName, meta: Me
 
 /**
  * System console output.
- * The [ConsoleOutput] is used when no other [OutputManager] is provided.
+ * The [CONSOLE_RENDERER] is used when no other [OutputManager] is provided.
  */
-expect val ConsoleOutput: Output<Any>
+val CONSOLE_RENDERER: Renderer<Any> = object : Renderer<Any> {
+    override fun render(obj: Any, meta: Meta) {
+        println(obj)
+    }
+
+    override val context: Context get() = Global
+
+}
 
 class ConsoleOutputManager : AbstractPlugin(), OutputManager {
     override val tag: PluginTag get() = ConsoleOutputManager.tag
 
-    override fun <T : Any> get(type: KClass<out T>, name: Name, stage: Name, meta: Meta): Output<T> = ConsoleOutput
+    override fun <T : Any> get(type: KClass<out T>, name: Name, stage: Name, meta: Meta): Renderer<T> = CONSOLE_RENDERER
 
     companion object : PluginFactory<ConsoleOutputManager> {
         override val tag = PluginTag("output.console", group = DATAFORGE_GROUP)
diff --git a/dataforge-output/src/commonMain/kotlin/hep/dataforge/output/Output.kt b/dataforge-output/src/commonMain/kotlin/hep/dataforge/output/Renderer.kt
similarity index 86%
rename from dataforge-output/src/commonMain/kotlin/hep/dataforge/output/Output.kt
rename to dataforge-output/src/commonMain/kotlin/hep/dataforge/output/Renderer.kt
index 091cb999..c1bcf6e5 100644
--- a/dataforge-output/src/commonMain/kotlin/hep/dataforge/output/Output.kt
+++ b/dataforge-output/src/commonMain/kotlin/hep/dataforge/output/Renderer.kt
@@ -7,11 +7,11 @@ import hep.dataforge.meta.Meta
 /**
  * A generic way to render any object in the output.
  *
- * An object could be rendered either in append or overlay mode. The mode is decided by the [Output]
+ * An object could be rendered either in append or overlay mode. The mode is decided by the [Renderer]
  * based on its configuration and provided meta
  *
  */
-interface Output<in T : Any> : ContextAware {
+interface Renderer<in T : Any> : ContextAware {
     /**
      * Render specific object with configuration.
      *
diff --git a/dataforge-output/src/commonMain/kotlin/hep/dataforge/output/TextOutput.kt b/dataforge-output/src/commonMain/kotlin/hep/dataforge/output/TextRenderer.kt
similarity index 56%
rename from dataforge-output/src/commonMain/kotlin/hep/dataforge/output/TextOutput.kt
rename to dataforge-output/src/commonMain/kotlin/hep/dataforge/output/TextRenderer.kt
index 77f589df..cc9d24f3 100644
--- a/dataforge-output/src/commonMain/kotlin/hep/dataforge/output/TextOutput.kt
+++ b/dataforge-output/src/commonMain/kotlin/hep/dataforge/output/TextRenderer.kt
@@ -2,48 +2,50 @@ package hep.dataforge.output
 
 import hep.dataforge.context.Context
 import hep.dataforge.meta.Meta
-import hep.dataforge.output.TextRenderer.Companion.TEXT_RENDERER_TYPE
+import hep.dataforge.output.TextFormat.Companion.TEXT_RENDERER_TYPE
 import hep.dataforge.provider.Type
 import hep.dataforge.provider.top
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.launch
+import kotlinx.io.Output
+import kotlinx.io.text.writeUtf8String
 import kotlin.reflect.KClass
 
-class TextOutput(override val context: Context, private val output: kotlinx.io.Output) : Output<Any> {
-    private val cache = HashMap<KClass<*>, TextRenderer>()
+class TextRenderer(override val context: Context, private val output: Output) : Renderer<Any> {
+    private val cache = HashMap<KClass<*>, TextFormat>()
 
     /**
-     * Find the first [TextRenderer] matching the given object type.
+     * Find the first [TextFormat] matching the given object type.
      */
     override fun render(obj: Any, meta: Meta) {
-        val renderer: TextRenderer = if (obj is CharSequence) {
-            DefaultTextRenderer
+        val format: TextFormat = if (obj is CharSequence) {
+            DefaultTextFormat
         } else {
             val value = cache[obj::class]
             if (value == null) {
                 val answer =
-                    context.top<TextRenderer>(TEXT_RENDERER_TYPE).values.firstOrNull { it.type.isInstance(obj) }
+                    context.top<TextFormat>(TEXT_RENDERER_TYPE).values.firstOrNull { it.type.isInstance(obj) }
                 if (answer != null) {
                     cache[obj::class] = answer
                     answer
                 } else {
-                    DefaultTextRenderer
+                    DefaultTextFormat
                 }
             } else {
                 value
             }
         }
         context.launch(Dispatchers.Output) {
-            renderer.run { output.render(obj) }
+            format.run { output.render(obj) }
         }
     }
 }
 
 /**
- * A text or binary renderer based on [kotlinx.io.Output]
+ * A text or binary renderer based on [Output]
  */
 @Type(TEXT_RENDERER_TYPE)
-interface TextRenderer {
+interface TextFormat {
     /**
      * The priority of this renderer compared to other renderers
      */
@@ -53,19 +55,18 @@ interface TextRenderer {
      */
     val type: KClass<*>
 
-    suspend fun kotlinx.io.Output.render(obj: Any)
+    suspend fun Output.render(obj: Any)
 
     companion object {
         const val TEXT_RENDERER_TYPE = "dataforge.textRenderer"
     }
 }
 
-object DefaultTextRenderer : TextRenderer {
+object DefaultTextFormat : TextFormat {
     override val priority: Int = Int.MAX_VALUE
     override val type: KClass<*> = Any::class
 
-    override suspend fun kotlinx.io.Output.render(obj: Any) {
-        append(obj.toString())
-        append('\n')
+    override suspend fun Output.render(obj: Any) {
+        writeUtf8String(obj.toString() + "\n")
     }
 }
\ No newline at end of file
diff --git a/dataforge-output/src/jsMain/kotlin/hep/dataforge/output/ConsoleOutput.kt b/dataforge-output/src/jsMain/kotlin/hep/dataforge/output/ConsoleOutput.kt
deleted file mode 100644
index b927a386..00000000
--- a/dataforge-output/src/jsMain/kotlin/hep/dataforge/output/ConsoleOutput.kt
+++ /dev/null
@@ -1,22 +0,0 @@
-package hep.dataforge.output
-
-import hep.dataforge.context.Context
-import hep.dataforge.context.Global
-import hep.dataforge.meta.Meta
-import kotlinx.coroutines.CoroutineDispatcher
-import kotlinx.coroutines.Dispatchers
-
-/**
- * System console output.
- * The [ConsoleOutput] is used when no other [OutputManager] is provided.
- */
-actual val ConsoleOutput: Output<Any> = object : Output<Any> {
-    override fun render(obj: Any, meta: Meta) {
-        println(obj)
-    }
-
-    override val context: Context get() = Global
-
-}
-
-actual val Dispatchers.Output: CoroutineDispatcher get() = Dispatchers.Default
\ No newline at end of file
diff --git a/dataforge-output/src/jsMain/kotlin/hep/dataforge/output/outputJS.kt b/dataforge-output/src/jsMain/kotlin/hep/dataforge/output/outputJS.kt
new file mode 100644
index 00000000..18a71f07
--- /dev/null
+++ b/dataforge-output/src/jsMain/kotlin/hep/dataforge/output/outputJS.kt
@@ -0,0 +1,7 @@
+package hep.dataforge.output
+
+import kotlinx.coroutines.CoroutineDispatcher
+import kotlinx.coroutines.Dispatchers
+
+
+actual val Dispatchers.Output: CoroutineDispatcher get() = Dispatchers.Default
\ No newline at end of file
diff --git a/dataforge-output/src/jvmMain/kotlin/hep/dataforge/output/ConsoleOutput.kt b/dataforge-output/src/jvmMain/kotlin/hep/dataforge/output/ConsoleOutput.kt
deleted file mode 100644
index 57ae4294..00000000
--- a/dataforge-output/src/jvmMain/kotlin/hep/dataforge/output/ConsoleOutput.kt
+++ /dev/null
@@ -1,13 +0,0 @@
-package hep.dataforge.output
-
-import hep.dataforge.context.Global
-import kotlinx.coroutines.Dispatchers
-import kotlinx.io.streams.asOutput
-
-/**
- * System console output.
- * The [ConsoleOutput] is used when no other [OutputManager] is provided.
- */
-actual val ConsoleOutput: Output<Any> = TextOutput(Global, System.out.asOutput())
-
-actual val Dispatchers.Output get() = Dispatchers.IO
\ No newline at end of file
diff --git a/dataforge-output/src/jvmMain/kotlin/hep/dataforge/output/outputJVM.kt b/dataforge-output/src/jvmMain/kotlin/hep/dataforge/output/outputJVM.kt
new file mode 100644
index 00000000..ea7c416c
--- /dev/null
+++ b/dataforge-output/src/jvmMain/kotlin/hep/dataforge/output/outputJVM.kt
@@ -0,0 +1,5 @@
+package hep.dataforge.output
+
+import kotlinx.coroutines.Dispatchers
+
+actual val Dispatchers.Output get() = Dispatchers.IO
\ No newline at end of file
diff --git a/dataforge-workspace/src/commonMain/kotlin/hep/dataforge/workspace/envelopeData.kt b/dataforge-workspace/src/commonMain/kotlin/hep/dataforge/workspace/envelopeData.kt
index 1b3a27cd..1a713e37 100644
--- a/dataforge-workspace/src/commonMain/kotlin/hep/dataforge/workspace/envelopeData.kt
+++ b/dataforge-workspace/src/commonMain/kotlin/hep/dataforge/workspace/envelopeData.kt
@@ -7,8 +7,7 @@ import hep.dataforge.io.IOFormat
 import hep.dataforge.io.SimpleEnvelope
 import hep.dataforge.io.readWith
 import kotlinx.coroutines.coroutineScope
-import kotlinx.io.Input
-import kotlinx.io.buildPacket
+import kotlinx.io.ArrayBinary
 import kotlin.reflect.KClass
 
 /**
@@ -22,15 +21,8 @@ suspend fun <T : Any> Data<T>.toEnvelope(format: IOFormat<T>): Envelope {
     val obj = coroutineScope {
         await(this)
     }
-    val binary = object : Binary {
-        override fun <R> read(block: Input.() -> R): R {
-            //TODO optimize away additional copy by creating inputs that reads directly from output
-            val packet = buildPacket {
-                format.run { writeObject(obj) }
-            }
-            return packet.block()
-        }
-
+    val binary = ArrayBinary.write {
+        format.run { writeObject(obj) }
     }
     return SimpleEnvelope(meta, binary)
 }
\ No newline at end of file
diff --git a/dataforge-workspace/src/jvmTest/kotlin/hep/dataforge/workspace/FileDataTest.kt b/dataforge-workspace/src/jvmTest/kotlin/hep/dataforge/workspace/FileDataTest.kt
index 8d8bc385..4fc9e9a4 100644
--- a/dataforge-workspace/src/jvmTest/kotlin/hep/dataforge/workspace/FileDataTest.kt
+++ b/dataforge-workspace/src/jvmTest/kotlin/hep/dataforge/workspace/FileDataTest.kt
@@ -8,8 +8,8 @@ import hep.dataforge.meta.DFExperimental
 import kotlinx.coroutines.runBlocking
 import kotlinx.io.Input
 import kotlinx.io.Output
-import kotlinx.io.readText
-import kotlinx.io.writeText
+import kotlinx.io.text.readUtf8String
+import kotlinx.io.text.writeUtf8String
 import java.nio.file.Files
 import kotlin.test.Ignore
 import kotlin.test.Test
@@ -30,11 +30,11 @@ class FileDataTest {
 
     object StringIOFormat : IOFormat<String> {
         override fun Output.writeObject(obj: String) {
-            writeText(obj)
+            writeUtf8String(obj)
         }
 
         override fun Input.readObject(): String {
-            return readText()
+            return readUtf8String()
         }
 
     }