diff --git a/weed/filesys/dirty_page.go b/weed/filesys/dirty_page.go
index 91a952421..871905fd5 100644
--- a/weed/filesys/dirty_page.go
+++ b/weed/filesys/dirty_page.go
@@ -21,19 +21,23 @@ type ContinuousDirtyPages struct {
 	lock    sync.Mutex
 }
 
+var bufPool = sync.Pool{
+	New: func() interface{} {
+		return new(bytes.Buffer)
+	},
+}
+
 func newDirtyPages(file *File) *ContinuousDirtyPages {
 	return &ContinuousDirtyPages{
-		Data: make([]byte, file.wfs.option.ChunkSizeLimit),
+		Data: nil,
 		f:    file,
 	}
 }
 
-func (pages *ContinuousDirtyPages) InitializeToFile(file *File) *ContinuousDirtyPages {
-	if len(pages.Data) != int(file.wfs.option.ChunkSizeLimit) {
-		pages.Data = make([]byte, file.wfs.option.ChunkSizeLimit)
+func (pages *ContinuousDirtyPages) releaseResource() {
+	if pages.Data != nil {
+		pages.f.wfs.bufPool.Put(pages.Data)
 	}
-	pages.f = file
-	return pages
 }
 
 func (pages *ContinuousDirtyPages) AddPage(ctx context.Context, offset int64, data []byte) (chunks []*filer_pb.FileChunk, err error) {
@@ -43,6 +47,10 @@ func (pages *ContinuousDirtyPages) AddPage(ctx context.Context, offset int64, da
 
 	var chunk *filer_pb.FileChunk
 
+	if pages.Data == nil {
+		pages.Data = pages.f.wfs.bufPool.Get().([]byte)
+	}
+
 	if len(data) > len(pages.Data) {
 		// this is more than what buffer can hold.
 		return pages.flushAndSave(ctx, offset, data)
diff --git a/weed/filesys/filehandle.go b/weed/filesys/filehandle.go
index bbaa39f05..7fdeb18f3 100644
--- a/weed/filesys/filehandle.go
+++ b/weed/filesys/filehandle.go
@@ -38,16 +38,6 @@ func newFileHandle(file *File, uid, gid uint32) *FileHandle {
 	}
 }
 
-func (fh *FileHandle) InitializeToFile(file *File, uid, gid uint32) *FileHandle {
-	newHandle := &FileHandle{
-		f:          file,
-		dirtyPages: fh.dirtyPages.InitializeToFile(file),
-		Uid:        uid,
-		Gid:        gid,
-	}
-	return newHandle
-}
-
 var _ = fs.Handle(&FileHandle{})
 
 // var _ = fs.HandleReadAller(&FileHandle{})
@@ -175,6 +165,8 @@ func (fh *FileHandle) Release(ctx context.Context, req *fuse.ReleaseRequest) err
 
 	glog.V(4).Infof("%v release fh %d", fh.f.fullpath(), fh.handle)
 
+	fh.dirtyPages.releaseResource()
+
 	fh.f.wfs.ReleaseHandle(fh.f.fullpath(), fuse.HandleID(fh.handle))
 
 	fh.f.isOpen = false
diff --git a/weed/filesys/wfs.go b/weed/filesys/wfs.go
index bb655c256..9808c560e 100644
--- a/weed/filesys/wfs.go
+++ b/weed/filesys/wfs.go
@@ -39,6 +39,7 @@ type WFS struct {
 	handles           []*FileHandle
 	pathToHandleIndex map[string]int
 	pathToHandleLock  sync.Mutex
+	bufPool           sync.Pool
 
 	stats statsCache
 }
@@ -52,6 +53,11 @@ func NewSeaweedFileSystem(option *Option) *WFS {
 		option:                    option,
 		listDirectoryEntriesCache: ccache.New(ccache.Configure().MaxSize(int64(option.DirListingLimit) + 200).ItemsToPrune(100)),
 		pathToHandleIndex:         make(map[string]int),
+		bufPool: sync.Pool{
+			New: func() interface{} {
+				return make([]byte, option.ChunkSizeLimit)
+			},
+		},
 	}
 }
 
@@ -76,17 +82,10 @@ func (wfs *WFS) AcquireHandle(file *File, uid, gid uint32) (fileHandle *FileHand
 
 	index, found := wfs.pathToHandleIndex[fullpath]
 	if found && wfs.handles[index] != nil {
-		glog.V(4).Infoln(fullpath, "found fileHandle id", index)
+		glog.V(2).Infoln(fullpath, "found fileHandle id", index)
 		return wfs.handles[index]
 	}
 
-	if found && wfs.handles[index] != nil {
-		glog.V(4).Infoln(fullpath, "reuse previous fileHandle id", index)
-		wfs.handles[index].InitializeToFile(file, uid, gid)
-		fileHandle.handle = uint64(index)
-		return
-	}
-
 	fileHandle = newFileHandle(file, uid, gid)
 	for i, h := range wfs.handles {
 		if h == nil {
@@ -100,7 +99,7 @@ func (wfs *WFS) AcquireHandle(file *File, uid, gid uint32) (fileHandle *FileHand
 
 	wfs.handles = append(wfs.handles, fileHandle)
 	fileHandle.handle = uint64(len(wfs.handles) - 1)
-	glog.V(4).Infoln(fullpath, "new fileHandle id", fileHandle.handle)
+	glog.V(2).Infoln(fullpath, "new fileHandle id", fileHandle.handle)
 	wfs.pathToHandleIndex[fullpath] = int(fileHandle.handle)
 
 	return