diff --git a/src/server/settings/torrbt.go b/src/server/settings/torrbt.go
index 8f01905..859fb49 100644
--- a/src/server/settings/torrbt.go
+++ b/src/server/settings/torrbt.go
@@ -8,11 +8,9 @@ import (
 
 type BTSets struct {
 	// Cache
-	CacheSize         int64 // in byte, def 200 mb
-	PreloadBufferSize int64 // in byte, buffer for preload
-
-	// Reader
-	ReaderPreload int // in percent, 5%-100%, [...S__X__E...] [S-E] not clean
+	CacheSize       int64 // in byte, def 200 mb
+	PreloadBuffer   bool
+	ReaderReadAHead int // in percent, 5%-100%, [...S__X__E...] [S-E] not clean
 
 	// Storage
 	SaveOnDisk  bool   // save on disk?
@@ -52,11 +50,11 @@ func SetBTSets(sets *BTSets) {
 		return
 	}
 
-	if sets.ReaderPreload < 5 {
-		sets.ReaderPreload = 5
+	if sets.ReaderReadAHead < 5 {
+		sets.ReaderReadAHead = 5
 	}
-	if sets.ReaderPreload > 100 {
-		sets.ReaderPreload = 100
+	if sets.ReaderReadAHead > 100 {
+		sets.ReaderReadAHead = 100
 	}
 	BTsets = sets
 	buf, err := json.Marshal(BTsets)
@@ -72,8 +70,8 @@ func loadBTSets() {
 	if len(buf) > 0 {
 		err := json.Unmarshal(buf, &BTsets)
 		if err == nil {
-			if BTsets.ReaderPreload < 5 {
-				BTsets.ReaderPreload = 5
+			if BTsets.ReaderReadAHead < 5 {
+				BTsets.ReaderReadAHead = 5
 			}
 			return
 		}
@@ -84,11 +82,11 @@ func loadBTSets() {
 	sets.EnableDebug = false
 	sets.DisableUTP = true
 	sets.CacheSize = 200 * 1024 * 1024 // 200mb
-	sets.PreloadBufferSize = 20 * 1024 * 1024
+	sets.PreloadBuffer = true
 	sets.ConnectionsLimit = 20
 	sets.DhtConnectionLimit = 500
 	sets.RetrackersMode = 1
 	sets.TorrentDisconnectTimeout = 30
-	sets.ReaderPreload = 70 // 70% preload
+	sets.ReaderReadAHead = 70 // 70% preload
 	BTsets = sets
 }
diff --git a/src/server/torr/apihelper.go b/src/server/torr/apihelper.go
index 363fcfe..cc2991d 100644
--- a/src/server/torr/apihelper.go
+++ b/src/server/torr/apihelper.go
@@ -6,11 +6,10 @@ import (
 	"sort"
 	"time"
 
-	"server/log"
-	sets "server/settings"
-
 	"github.com/anacrolix/torrent"
 	"github.com/anacrolix/torrent/metainfo"
+	"server/log"
+	sets "server/settings"
 )
 
 var (
@@ -128,3 +127,16 @@ func Shutdown() {
 func WriteStatus(w io.Writer) {
 	bts.client.WriteStatus(w)
 }
+
+func Preload(torr *Torrent, index int) {
+	if !sets.BTsets.PreloadBuffer {
+		size := int64(20 * 1024 * 1024)
+		if size > sets.BTsets.CacheSize {
+			size = sets.BTsets.CacheSize
+		}
+		torr.Preload(index, size)
+	} else {
+		size := int64(float32(sets.BTsets.ReaderReadAHead) / 100.0 * float32(sets.BTsets.CacheSize))
+		torr.Preload(index, size)
+	}
+}
diff --git a/src/server/torr/storage/torrstor/readerloader.go b/src/server/torr/storage/torrstor/readerloader.go
index 5d7641b..f4282eb 100644
--- a/src/server/torr/storage/torrstor/readerloader.go
+++ b/src/server/torr/storage/torrstor/readerloader.go
@@ -20,7 +20,7 @@ func (r *Reader) getPieceNum(offset int64) int {
 }
 
 func (r *Reader) getReaderRange() (int64, int64) {
-	prc := int64(settings.BTsets.ReaderPreload)
+	prc := int64(settings.BTsets.ReaderReadAHead)
 	beginOffset := r.offset - r.cache.capacity*(100-prc)/100
 	endOffset := r.offset + r.cache.capacity*prc/100
 
diff --git a/src/server/web/api/stream.go b/src/server/web/api/stream.go
index 85b9827..31f68d9 100644
--- a/src/server/web/api/stream.go
+++ b/src/server/web/api/stream.go
@@ -92,7 +92,7 @@ func stream(c *gin.Context) {
 	}
 	// preload torrent
 	if preload {
-		tor.Preload(index, 0)
+		torr.Preload(tor, index)
 	}
 	// return stat if query
 	if stat {