diff --git a/src/main/java/io/netty/channel/socket/nio/NioSocketChannel.java b/src/main/java/io/netty/channel/socket/nio/NioSocketChannel.java
index a7343419b8..f00046de54 100644
--- a/src/main/java/io/netty/channel/socket/nio/NioSocketChannel.java
+++ b/src/main/java/io/netty/channel/socket/nio/NioSocketChannel.java
@@ -56,7 +56,7 @@ import sun.nio.ch.ChannelPerf;
 /** {@link io.netty.channel.socket.SocketChannel} which uses NIO selector based implementation. */
 public class NioSocketChannel extends AbstractNioByteChannel
     implements io.netty.channel.socket.SocketChannel {
-  private static final double SLOW_IO_THRESHOLD = 0.01;
+  private static final long SLOW_IO_THRESHOLD = 10_000_000;
   public static final Histogram socketWriteDuration =
       HistogramUtils.buildDuration()
           .name("netty_nio_socket_channel_write_duration_seconds")
@@ -392,11 +392,12 @@ public class NioSocketChannel extends AbstractNioByteChannel
     final RecvByteBufAllocator.Handle allocHandle = unsafe().recvBufAllocHandle();
     int attemptedBytes = byteBuf.writableBytes();
     allocHandle.attemptedBytesRead(attemptedBytes);
-    Histogram.Timer socketReadTime = socketReadDuration.startTimer();
     SocketChannel sc = javaChannel();
+    Histogram.Timer socketReadTime = socketReadDuration.startTimer();
+    long start = System.nanoTime();
     int localReadBytes = byteBuf.writeBytes(sc, allocHandle.attemptedBytesRead());
     double duration = socketReadTime.observeDuration();
-    if (duration > SLOW_IO_THRESHOLD) {
+    if (System.nanoTime() - start >= SLOW_IO_THRESHOLD) {
       // read slower than 10ms is strange
       System.out.println(
           "[slow io] read "
@@ -478,9 +479,10 @@ public class NioSocketChannel extends AbstractNioByteChannel
             int attemptedBytes = buffer.remaining();
             socketWriteBytes.observe(attemptedBytes);
             Histogram.Timer writeTime = socketWriteDuration.startTimer();
+            long start = System.nanoTime();
             final int localWrittenBytes = ch.write(buffer);
             double duration = writeTime.observeDuration();
-            if (duration > SLOW_IO_THRESHOLD) {
+            if (System.nanoTime() - start >= SLOW_IO_THRESHOLD) {
               // read slower than 10ms is strange
               System.out.println(
                   "[slow io] write "
@@ -516,9 +518,10 @@ public class NioSocketChannel extends AbstractNioByteChannel
             long attemptedBytes = in.nioBufferSize();
             socketWriteBytes.observe(attemptedBytes);
             Histogram.Timer writeTime = socketWriteDuration.startTimer();
+            long start = System.nanoTime();
             final long localWrittenBytes = ch.write(nioBuffers, 0, nioBufferCnt);
             double duration = writeTime.observeDuration();
-            if (duration > SLOW_IO_THRESHOLD) {
+            if (System.nanoTime() - start >= SLOW_IO_THRESHOLD) {
               // read slower than 10ms is strange
               System.out.println(
                   "[slow io] write "