diff --git a/weed/command/server.go b/weed/command/server.go
index 74f0e582e..78b52ea4b 100644
--- a/weed/command/server.go
+++ b/weed/command/server.go
@@ -132,6 +132,7 @@ func init() {
 	serverOptions.v.idxFolder = cmdServer.Flag.String("volume.dir.idx", "", "directory to store .idx files")
 	serverOptions.v.inflightUploadDataTimeout = cmdServer.Flag.Duration("volume.inflightUploadDataTimeout", 60*time.Second, "inflight upload data wait timeout of volume servers")
 	serverOptions.v.hasSlowRead = cmdServer.Flag.Bool("volume.hasSlowRead", false, "<experimental> if true, this prevents slow reads from blocking other requests, but large file read P99 latency will increase.")
+	serverOptions.v.readBufferSize = cmdServer.Flag.Int("volume.readBufferSize", 1024 * 1024, "<experimental> larger values can optimize query performance but will increase some memory usage,Use with hasSlowRead normally")
 
 	s3Options.port = cmdServer.Flag.Int("s3.port", 8333, "s3 server http listen port")
 	s3Options.portGrpc = cmdServer.Flag.Int("s3.port.grpc", 0, "s3 server grpc listen port")
diff --git a/weed/command/volume.go b/weed/command/volume.go
index 3b31ada50..5b62a4844 100644
--- a/weed/command/volume.go
+++ b/weed/command/volume.go
@@ -67,6 +67,7 @@ type VolumeServerOptions struct {
 	// pulseSeconds          *int
 	inflightUploadDataTimeout *time.Duration
 	hasSlowRead               *bool
+	readBufferSize            *int
 }
 
 func init() {
@@ -98,6 +99,7 @@ func init() {
 	v.idxFolder = cmdVolume.Flag.String("dir.idx", "", "directory to store .idx files")
 	v.inflightUploadDataTimeout = cmdVolume.Flag.Duration("inflightUploadDataTimeout", 60*time.Second, "inflight upload data wait timeout of volume servers")
 	v.hasSlowRead = cmdVolume.Flag.Bool("hasSlowRead", false, "<experimental> if true, this prevents slow reads from blocking other requests, but large file read P99 latency will increase.")
+	v.readBufferSize = cmdVolume.Flag.Int("readBufferSize", 1024 * 1024, "<experimental> larger values can optimize query performance but will increase some memory usage,Use with hasSlowRead normally.")
 }
 
 var cmdVolume = &Command{
@@ -246,6 +248,7 @@ func (v VolumeServerOptions) startVolumeServer(volumeFolders, maxVolumeCounts, v
 		int64(*v.concurrentDownloadLimitMB)*1024*1024,
 		*v.inflightUploadDataTimeout,
 		*v.hasSlowRead,
+		*v.readBufferSize,
 	)
 	// starting grpc server
 	grpcS := v.startGrpcService(volumeServer)
diff --git a/weed/server/filer_server_handlers_write.go b/weed/server/filer_server_handlers_write.go
index fc767dd9e..d2c296fad 100644
--- a/weed/server/filer_server_handlers_write.go
+++ b/weed/server/filer_server_handlers_write.go
@@ -195,6 +195,8 @@ func (fs *FilerServer) DeleteHandler(w http.ResponseWriter, r *http.Request) {
 		httpStatus := http.StatusInternalServerError
 		if err == filer_pb.ErrNotFound {
 			httpStatus = http.StatusNoContent
+			writeJsonQuiet(w, r, httpStatus, nil)
+			return
 		}
 		writeJsonError(w, r, httpStatus, err)
 		return
diff --git a/weed/server/volume_server.go b/weed/server/volume_server.go
index 8bf50ce45..07bb0b9ee 100644
--- a/weed/server/volume_server.go
+++ b/weed/server/volume_server.go
@@ -29,6 +29,7 @@ type VolumeServer struct {
 	inFlightDownloadDataLimitCond *sync.Cond
 	inflightUploadDataTimeout     time.Duration
 	hasSlowRead                   bool
+	readBufferSize                int
 
 	SeedMasterNodes []pb.ServerAddress
 	currentMaster   pb.ServerAddress
@@ -66,6 +67,7 @@ func NewVolumeServer(adminMux, publicMux *http.ServeMux, ip string,
 	concurrentDownloadLimit int64,
 	inflightUploadDataTimeout time.Duration,
 	hasSlowRead bool,
+	readBufferSize int,
 ) *VolumeServer {
 
 	v := util.GetViper()
@@ -96,6 +98,7 @@ func NewVolumeServer(adminMux, publicMux *http.ServeMux, ip string,
 		concurrentDownloadLimit:       concurrentDownloadLimit,
 		inflightUploadDataTimeout:     inflightUploadDataTimeout,
 		hasSlowRead:                   hasSlowRead,
+		readBufferSize:                readBufferSize,
 	}
 	vs.SeedMasterNodes = masterNodes
 
diff --git a/weed/server/volume_server_handlers_read.go b/weed/server/volume_server_handlers_read.go
index b8f4120a6..facdf2556 100644
--- a/weed/server/volume_server_handlers_read.go
+++ b/weed/server/volume_server_handlers_read.go
@@ -116,8 +116,9 @@ func (vs *VolumeServer) GetOrHeadHandler(w http.ResponseWriter, r *http.Request)
 	cookie := n.Cookie
 
 	readOption := &storage.ReadOption{
-		ReadDeleted: r.FormValue("readDeleted") == "true",
-		HasSlowRead: vs.hasSlowRead,
+		ReadDeleted:    r.FormValue("readDeleted") == "true",
+		HasSlowRead:    vs.hasSlowRead,
+		ReadBufferSize: vs.readBufferSize,
 	}
 
 	var count int
diff --git a/weed/shell/command_fs_configure.go b/weed/shell/command_fs_configure.go
index 1bf42b9ab..60edb79c2 100644
--- a/weed/shell/command_fs_configure.go
+++ b/weed/shell/command_fs_configure.go
@@ -98,7 +98,7 @@ func (c *commandFsConfigure) Do(args []string, commandEnv *CommandEnv, writer io
 				return fmt.Errorf("parse replication %s: %v", *replication, err)
 			}
 			if *volumeGrowthCount%rp.GetCopyCount() != 0 {
-				return fmt.Errorf("volumeGrowthCount %d should be devided by replication copy count %d", *volumeGrowthCount, rp.GetCopyCount())
+				return fmt.Errorf("volumeGrowthCount %d should be divided by replication copy count %d", *volumeGrowthCount, rp.GetCopyCount())
 			}
 		}
 
diff --git a/weed/shell/command_lock_unlock.go b/weed/shell/command_lock_unlock.go
index a69be21c7..a214ea91c 100644
--- a/weed/shell/command_lock_unlock.go
+++ b/weed/shell/command_lock_unlock.go
@@ -21,7 +21,7 @@ func (c *commandLock) Name() string {
 func (c *commandLock) Help() string {
 	return `lock in order to exclusively manage the cluster
 
-	This is a blocking operation if there is alread another lock.
+	This is a blocking operation if there is already another lock.
 `
 }
 
diff --git a/weed/shell/command_remote_meta_sync.go b/weed/shell/command_remote_meta_sync.go
index ebd43c326..bc9075746 100644
--- a/weed/shell/command_remote_meta_sync.go
+++ b/weed/shell/command_remote_meta_sync.go
@@ -96,7 +96,7 @@ After caching the file content, the entry.RemoteEntry will be
 	remoteEntry.LastLocalSyncTsNs == time.Now.UnixNano()
 	Attributes.FileSize = uint64(remoteEntry.RemoteSize)
 	Attributes.Mtime = remoteEntry.RemoteMtime
-	chunks = non-emtpy
+	chunks = non-empty
 
 When "weed filer.remote.sync" to upload local changes to remote, the criteria is:
 
diff --git a/weed/shell/command_s3_circuitbreaker_test.go b/weed/shell/command_s3_circuitbreaker_test.go
index 3d0b4ac6e..d1d92f9f8 100644
--- a/weed/shell/command_s3_circuitbreaker_test.go
+++ b/weed/shell/command_s3_circuitbreaker_test.go
@@ -285,7 +285,7 @@ func TestCircuitBreakerShell(t *testing.T) {
 				t.Error(err)
 			}
 			if !reflect.DeepEqual(actual, expect) {
-				t.Fatal("result of s3 circuit breaker shell command is unexpect!")
+				t.Fatal("result of s3 circuit breaker shell command is unexpected!")
 			}
 		}
 	}
diff --git a/weed/shell/command_s3_clean_uploads.go b/weed/shell/command_s3_clean_uploads.go
index 831ca47c0..81af4bbb7 100644
--- a/weed/shell/command_s3_clean_uploads.go
+++ b/weed/shell/command_s3_clean_uploads.go
@@ -60,7 +60,7 @@ func (c *commandS3CleanUploads) Do(args []string, commandEnv *CommandEnv, writer
 
 	for _, bucket := range buckets {
 		if err := c.cleanupUploads(commandEnv, writer, filerBucketsPath, bucket, *uploadedTimeAgo, signingKey); err != nil {
-			fmt.Fprintf(writer, fmt.Sprintf("failed cleanup uploads for backet %s: %v", bucket, err))
+			fmt.Fprintf(writer, fmt.Sprintf("failed cleanup uploads for bucket %s: %v", bucket, err))
 		}
 	}
 
diff --git a/weed/storage/backend/memory_map/memory_map_windows.go b/weed/storage/backend/memory_map/memory_map_windows.go
index b65e1b20a..ce0c04318 100644
--- a/weed/storage/backend/memory_map/memory_map_windows.go
+++ b/weed/storage/backend/memory_map/memory_map_windows.go
@@ -153,7 +153,7 @@ func allocate(hMapFile windows.Handle, offset uint64, length uint64, write bool)
 
 	mBuffer := MemoryBuffer{}
 
-	//align memory allocations to the minium virtal memory allocation size
+	//align memory allocations to the minium virtual memory allocation size
 	dwSysGran := systemInfo.dwAllocationGranularity
 
 	start := (offset / uint64(dwSysGran)) * uint64(dwSysGran)
diff --git a/weed/storage/needle/file_id_test.go b/weed/storage/needle/file_id_test.go
index ee5175d39..2796470aa 100644
--- a/weed/storage/needle/file_id_test.go
+++ b/weed/storage/needle/file_id_test.go
@@ -15,7 +15,7 @@ func TestParseFileIdFromString(t *testing.T) {
 	fidStr1 = "100, 12345678"
 	_, err = ParseFileIdFromString(fidStr1)
 	if err == nil {
-		t.Errorf("%s : needlId invalid syntax", fidStr1)
+		t.Errorf("%s : needleId invalid syntax", fidStr1)
 	}
 
 	fidStr1 = "100,123456789"
diff --git a/weed/storage/needle/needle_parse_upload.go b/weed/storage/needle/needle_parse_upload.go
index e733cfb99..e00729811 100644
--- a/weed/storage/needle/needle_parse_upload.go
+++ b/weed/storage/needle/needle_parse_upload.go
@@ -195,7 +195,7 @@ func parseMultipart(r *http.Request, sizeLimit int64, pu *ParsedUpload) (e error
 		}
 		contentType := part.Header.Get("Content-Type")
 		if contentType != "" && contentType != "application/octet-stream" && mtype != contentType {
-			pu.MimeType = contentType // only return mime type if not deductable
+			pu.MimeType = contentType // only return mime type if not deducible
 			mtype = contentType
 		}
 
diff --git a/weed/storage/needle/needle_write.go b/weed/storage/needle/needle_write.go
index a562417df..60b6e7adb 100644
--- a/weed/storage/needle/needle_write.go
+++ b/weed/storage/needle/needle_write.go
@@ -128,7 +128,7 @@ func (n *Needle) Append(w backend.BackendStorageFile, version Version) (offset u
 		return
 	}
 	if offset >= MaxPossibleVolumeSize && n.Size.IsValid() {
-		err = fmt.Errorf("Volume Size %d Exeededs %d", offset, MaxPossibleVolumeSize)
+		err = fmt.Errorf("Volume Size %d Exceeded %d", offset, MaxPossibleVolumeSize)
 		return
 	}
 
diff --git a/weed/storage/store.go b/weed/storage/store.go
index 48736c1a9..76be2fa9c 100644
--- a/weed/storage/store.go
+++ b/weed/storage/store.go
@@ -44,6 +44,10 @@ type ReadOption struct {
 	//  * read requests should complete asap, not blocking other requests.
 	//  * write requests may see high latency when downloading large files.
 	HasSlowRead bool
+
+	// increasing ReadBufferSize can reduce the number of get locks times and shorten read P99 latency.
+	// but will increase memory usage a bit. Use with hasSlowRead normally.
+	ReadBufferSize int
 }
 
 /*
@@ -58,7 +62,7 @@ type Store struct {
 	GrpcPort            int
 	PublicUrl           string
 	Locations           []*DiskLocation
-	dataCenter          string // optional informaton, overwriting master setting if exists
+	dataCenter          string // optional information, overwriting master setting if exists
 	rack                string // optional information, overwriting master setting if exists
 	connected           bool
 	NeedleMapKind       NeedleMapKind
diff --git a/weed/storage/store_ec.go b/weed/storage/store_ec.go
index 8d7e890b3..b46803fb2 100644
--- a/weed/storage/store_ec.go
+++ b/weed/storage/store_ec.go
@@ -339,7 +339,7 @@ func (s *Store) recoverOneRemoteEcShardInterval(needleId types.NeedleId, ecVolum
 	ecVolume.ShardLocationsLock.RLock()
 	for shardId, locations := range ecVolume.ShardLocations {
 
-		// skip currnent shard or empty shard
+		// skip current shard or empty shard
 		if shardId == shardIdToRecover {
 			continue
 		}
diff --git a/weed/storage/store_vacuum.go b/weed/storage/store_vacuum.go
index e8db7d7cd..0f25c888a 100644
--- a/weed/storage/store_vacuum.go
+++ b/weed/storage/store_vacuum.go
@@ -10,7 +10,7 @@ import (
 
 func (s *Store) CheckCompactVolume(volumeId needle.VolumeId) (float64, error) {
 	if v := s.findVolume(volumeId); v != nil {
-		glog.V(3).Infof("volumd %d garbage level: %f", volumeId, v.garbageLevel())
+		glog.V(3).Infof("volume %d garbage level: %f", volumeId, v.garbageLevel())
 		return v.garbageLevel(), nil
 	}
 	return 0, fmt.Errorf("volume id %d is not found during check compact", volumeId)
diff --git a/weed/storage/volume_read.go b/weed/storage/volume_read.go
index 43300dbe7..8b30bd5d4 100644
--- a/weed/storage/volume_read.go
+++ b/weed/storage/volume_read.go
@@ -135,7 +135,7 @@ func (v *Volume) readNeedleDataInto(n *needle.Needle, readOption *ReadOption, wr
 		actualOffset += int64(MaxPossibleVolumeSize)
 	}
 
-	buf := mem.Allocate(min(1024*1024, int(size)))
+	buf := mem.Allocate(min(readOption.ReadBufferSize, int(size)))
 	defer mem.Free(buf)
 
 	// read needle data
diff --git a/weed/storage/volume_vacuum.go b/weed/storage/volume_vacuum.go
index 642b3eab5..2862ca94d 100644
--- a/weed/storage/volume_vacuum.go
+++ b/weed/storage/volume_vacuum.go
@@ -167,7 +167,7 @@ func (v *Volume) CommitCompact() error {
 	if e = v.load(true, false, v.needleMapKind, 0); e != nil {
 		return e
 	}
-	glog.V(3).Infof("Finish commiting volume %d", v.Id)
+	glog.V(3).Infof("Finish committing volume %d", v.Id)
 	return nil
 }
 
diff --git a/weed/storage/volume_write.go b/weed/storage/volume_write.go
index 49022cc0a..223e19577 100644
--- a/weed/storage/volume_write.go
+++ b/weed/storage/volume_write.go
@@ -81,7 +81,7 @@ func removeVolumeFiles(filename string) {
 	// compaction
 	os.Remove(filename + ".cpd")
 	os.Remove(filename + ".cpx")
-	// level db indx file
+	// level db index file
 	os.RemoveAll(filename + ".ldb")
 	// marker for damaged or incomplete volume
 	os.Remove(filename + ".note")