diff --git a/core/src/main/scala/epollcat/internal/ch/EpollAsyncSocketChannel.scala b/core/src/main/scala/epollcat/internal/ch/EpollAsyncSocketChannel.scala
index 37b3571..2541e6d 100644
--- a/core/src/main/scala/epollcat/internal/ch/EpollAsyncSocketChannel.scala
+++ b/core/src/main/scala/epollcat/internal/ch/EpollAsyncSocketChannel.scala
@@ -114,42 +114,42 @@ final class EpollAsyncSocketChannel private (
       handler: CompletionHandler[Integer, _ >: A]
   ): Unit =
     if (readReady) {
-      Zone { implicit z =>
-        val count = dst.remaining()
-        val buf = alloc[Byte](count.toLong)
-
-        def completed(total: Int): Unit = {
-          var i = 0
-          while (i < total) {
-            dst.put(buf(i.toLong))
-            i += 1
-          }
-          handler.completed(total, attachment)
-        }
+      val position = dst.position()
+      val count = dst.remaining()
+      val hasArray = dst.hasArray()
+      val buf = if (hasArray) dst.array() else new Array[Byte](count)
+      val offset = if (hasArray) dst.arrayOffset() + position else 0
 
-        @tailrec
-        def go(buf: Ptr[Byte], count: Int, total: Int): Unit = {
-          val readed = posix.unistd.read(fd, buf, count.toULong)
-          if (readed == -1) {
-            val e = errno.errno
-            if (e == posix.errno.EAGAIN || e == posix.errno.EWOULDBLOCK) {
-              readReady = false
-              completed(total)
-            } else
-              handler.failed(new RuntimeException(s"read: $e"), attachment)
-          } else if (readed == 0) {
-            if (total > 0)
-              completed(total)
-            else
-              handler.completed(-1, attachment)
-          } else if (readed < count)
-            go(buf + readed.toLong, count - readed, total + readed)
-          else // readed == count
-            completed(total + readed)
-        }
+      def completed(total: Int): Unit = {
+        if (hasArray)
+          dst.position(position + total)
+        else
+          dst.put(buf, 0, total)
+        handler.completed(total, attachment)
+      }
 
-        go(buf, count, 0)
+      @tailrec
+      def go(buf: Ptr[Byte], count: Int, total: Int): Unit = {
+        val readed = posix.unistd.read(fd, buf, count.toULong)
+        if (readed == -1) {
+          val e = errno.errno
+          if (e == posix.errno.EAGAIN || e == posix.errno.EWOULDBLOCK) {
+            readReady = false
+            completed(total)
+          } else
+            handler.failed(new RuntimeException(s"read: $e"), attachment)
+        } else if (readed == 0) {
+          if (total > 0)
+            completed(total)
+          else
+            handler.completed(-1, attachment)
+        } else if (readed < count)
+          go(buf + readed.toLong, count - readed, total + readed)
+        else // readed == count
+          completed(total + readed)
       }
+
+      go(buf.at(offset), count, 0)
     } else {
       readCallback = () => {
         readCallback = null
@@ -294,44 +294,46 @@ final class EpollAsyncSocketChannel private (
   ): Unit = if (outputShutdown)
     handler.failed(new ClosedChannelException, attachment)
   else if (writeReady) {
-    Zone { implicit z =>
-      val position = src.position()
-      val count = src.remaining()
-      val buf = alloc[Byte](count.toLong)
-      var i = 0
-      while (i < count) {
-        buf(i.toLong) = src.get(position + i)
-        i += 1
+    val position = src.position()
+    val count = src.remaining()
+
+    val hasArray = src.hasArray()
+    val buf =
+      if (hasArray) src.array()
+      else {
+        val buf = new Array[Byte](count)
+        src.get(buf)
+        buf
       }
+    val offset = if (hasArray) src.arrayOffset() + position else 0
 
-      def completed(total: Int): Unit = {
-        src.position(position + total)
-        handler.completed(total, attachment)
-      }
-
-      @tailrec
-      def go(buf: Ptr[Byte], count: Int, total: Int): Unit = {
-        val wrote =
-          if (LinktimeInfo.isLinux)
-            posix.sys.socket.send(fd, buf, count.toULong, socket.MSG_NOSIGNAL).toInt
-          else
-            posix.unistd.write(fd, buf, count.toULong)
-
-        if (wrote == -1) {
-          val e = errno.errno
-          if (e == posix.errno.EAGAIN || e == posix.errno.EWOULDBLOCK) {
-            writeReady = false
-            completed(total)
-          } else
-            handler.failed(new RuntimeException(s"write: $e"), attachment)
-        } else if (wrote < count)
-          go(buf + wrote.toLong, count - wrote, total + wrote)
-        else // wrote == count
-          completed(total + wrote)
-      }
+    def completed(total: Int): Unit = {
+      src.position(position + total)
+      handler.completed(total, attachment)
+    }
 
-      go(buf, count, 0)
+    @tailrec
+    def go(buf: Ptr[Byte], count: Int, total: Int): Unit = {
+      val wrote =
+        if (LinktimeInfo.isLinux)
+          posix.sys.socket.send(fd, buf, count.toULong, socket.MSG_NOSIGNAL).toInt
+        else
+          posix.unistd.write(fd, buf, count.toULong)
+
+      if (wrote == -1) {
+        val e = errno.errno
+        if (e == posix.errno.EAGAIN || e == posix.errno.EWOULDBLOCK) {
+          writeReady = false
+          completed(total)
+        } else
+          handler.failed(new RuntimeException(s"write: $e"), attachment)
+      } else if (wrote < count)
+        go(buf + wrote.toLong, count - wrote, total + wrote)
+      else // wrote == count
+        completed(total + wrote)
     }
+
+    go(buf.at(offset), count, 0)
   } else {
     writeCallback = () => {
       writeCallback = null