diff --git a/feature_stream.go b/feature_stream.go
index 97355eb5..db78ec6f 100644
--- a/feature_stream.go
+++ b/feature_stream.go
@@ -14,6 +14,7 @@ type Stream struct {
 	Error      error
 	indention  int
 	Attachment interface{} // open for customized encoder
+	floatBuf   []byte
 }
 
 // NewStream create new stream instance.
@@ -28,6 +29,7 @@ func NewStream(cfg API, out io.Writer, bufSize int) *Stream {
 		n:         0,
 		Error:     nil,
 		indention: 0,
+		floatBuf:  make([]byte, 0, 32),
 	}
 }
 
diff --git a/feature_stream_float.go b/feature_stream_float.go
index 9a404e11..2838713f 100644
--- a/feature_stream_float.go
+++ b/feature_stream_float.go
@@ -21,7 +21,9 @@ func (stream *Stream) WriteFloat32(val float32) {
 			fmt = 'e'
 		}
 	}
-	stream.WriteRaw(strconv.FormatFloat(float64(val), fmt, -1, 32))
+	stream.floatBuf = strconv.AppendFloat(stream.floatBuf, float64(val), fmt, -1, 32)
+	stream.Write(stream.floatBuf)
+	stream.floatBuf = stream.floatBuf[:0]
 }
 
 // WriteFloat32Lossy write float32 to stream with ONLY 6 digits precision although much much faster
@@ -63,7 +65,9 @@ func (stream *Stream) WriteFloat64(val float64) {
 			fmt = 'e'
 		}
 	}
-	stream.WriteRaw(strconv.FormatFloat(float64(val), fmt, -1, 64))
+	stream.floatBuf = strconv.AppendFloat(stream.floatBuf, float64(val), fmt, -1, 64)
+	stream.Write(stream.floatBuf)
+	stream.floatBuf = stream.floatBuf[:0]
 }
 
 // WriteFloat64Lossy write float64 to stream with ONLY 6 digits precision although much much faster