diff --git a/common/buf/io.go b/common/buf/io.go
index d82795cd2..a7abeff1d 100644
--- a/common/buf/io.go
+++ b/common/buf/io.go
@@ -57,18 +57,6 @@ func NewReader(reader io.Reader) Reader {
 
 	return &BytesToBufferReader{
 		reader: reader,
-		buffer: make([]byte, 32*1024),
-	}
-}
-
-func NewMergingReader(reader io.Reader) Reader {
-	return NewMergingReaderSize(reader, 32*1024)
-}
-
-func NewMergingReaderSize(reader io.Reader, size uint32) Reader {
-	return &BytesToBufferReader{
-		reader: reader,
-		buffer: make([]byte, size),
 	}
 }
 
diff --git a/common/buf/reader.go b/common/buf/reader.go
index cade2a787..8715075a7 100644
--- a/common/buf/reader.go
+++ b/common/buf/reader.go
@@ -12,8 +12,30 @@ type BytesToBufferReader struct {
 	buffer []byte
 }
 
+func NewBytesToBufferReader(reader io.Reader) Reader {
+	return &BytesToBufferReader{
+		reader: reader,
+	}
+}
+
+func (r *BytesToBufferReader) readSmall() (MultiBuffer, error) {
+	b := New()
+	if err := b.Reset(ReadFrom(r.reader)); err != nil {
+		b.Release()
+		return nil, err
+	}
+	if b.IsFull() {
+		r.buffer = make([]byte, 32*1024)
+	}
+	return NewMultiBufferValue(b), nil
+}
+
 // Read implements Reader.Read().
 func (r *BytesToBufferReader) Read() (MultiBuffer, error) {
+	if r.buffer == nil {
+		return r.readSmall()
+	}
+
 	nBytes, err := r.reader.Read(r.buffer)
 	if err != nil {
 		return nil, err
diff --git a/common/buf/reader_test.go b/common/buf/reader_test.go
index 7c79d0fdc..f33ed4ced 100644
--- a/common/buf/reader_test.go
+++ b/common/buf/reader_test.go
@@ -14,12 +14,13 @@ import (
 func TestAdaptiveReader(t *testing.T) {
 	assert := With(t)
 
-	rawContent := make([]byte, 1024*1024)
-	buffer := bytes.NewBuffer(rawContent)
-
-	reader := NewReader(buffer)
+	reader := NewReader(bytes.NewReader(make([]byte, 1024*1024)))
 	b, err := reader.Read()
 	assert(err, IsNil)
+	assert(b.Len(), Equals, 2*1024)
+
+	b, err = reader.Read()
+	assert(err, IsNil)
 	assert(b.Len(), Equals, 32*1024)
 }
 
diff --git a/transport/internet/tls/tls.go b/transport/internet/tls/tls.go
index 12f5a155a..42ade5f79 100644
--- a/transport/internet/tls/tls.go
+++ b/transport/internet/tls/tls.go
@@ -23,7 +23,7 @@ type conn struct {
 
 func (c *conn) ReadMultiBuffer() (buf.MultiBuffer, error) {
 	if c.mergingReader == nil {
-		c.mergingReader = buf.NewMergingReaderSize(c.Conn, 16*1024)
+		c.mergingReader = buf.NewBytesToBufferReader(c.Conn)
 	}
 	return c.mergingReader.Read()
 }
diff --git a/transport/internet/websocket/connection.go b/transport/internet/websocket/connection.go
index 123621aa5..bcdde3cff 100644
--- a/transport/internet/websocket/connection.go
+++ b/transport/internet/websocket/connection.go
@@ -49,7 +49,7 @@ func (c *connection) Read(b []byte) (int, error) {
 
 func (c *connection) ReadMultiBuffer() (buf.MultiBuffer, error) {
 	if c.mergingReader == nil {
-		c.mergingReader = buf.NewMergingReader(c)
+		c.mergingReader = buf.NewBytesToBufferReader(c)
 	}
 	return c.mergingReader.Read()
 }