diff --git a/internal/querynode/mock_test.go b/internal/querynode/mock_test.go
index cb138321ea9ead44bd490473a00335ed71b18191..f82d60d6f6b13794a2418820053de41add137c6e 100644
--- a/internal/querynode/mock_test.go
+++ b/internal/querynode/mock_test.go
@@ -339,7 +339,7 @@ func loadIndexForSegment(ctx context.Context, node *QueryNode, segmentID UniqueI
 		},
 	}
 
-	err = loader.loadSegment(req, segmentTypeSealed)
+	err = loader.LoadSegment(req, segmentTypeSealed)
 	if err != nil {
 		return err
 	}
diff --git a/internal/querynode/segment_loader.go b/internal/querynode/segment_loader.go
index c8204fb64da71280e797fe9cda477447d07d4ce8..616ea2eb9e2d647ea5537b3cba2fe4ec16a31681 100644
--- a/internal/querynode/segment_loader.go
+++ b/internal/querynode/segment_loader.go
@@ -71,28 +71,27 @@ func (loader *segmentLoader) getFieldType(segment *Segment, fieldID FieldID) (sc
 	return coll.getFieldType(fieldID)
 }
 
-func (loader *segmentLoader) loadSegment(req *querypb.LoadSegmentsRequest, segmentType segmentType) error {
+func (loader *segmentLoader) LoadSegment(req *querypb.LoadSegmentsRequest, segmentType segmentType) error {
 	if req.Base == nil {
 		return fmt.Errorf("nil base message when load segment, collectionID = %d", req.CollectionID)
 	}
 
 	// no segment needs to load, return
-	if len(req.Infos) == 0 {
+	segmentNum := len(req.Infos)
+
+	if segmentNum == 0 {
 		return nil
 	}
 
 	log.Info("segmentLoader start loading...",
 		zap.Any("collectionID", req.CollectionID),
-		zap.Any("numOfSegments", len(req.Infos)),
-		zap.Any("loadType", segmentType),
-	)
+		zap.Any("segmentNum", segmentNum),
+		zap.Any("loadType", segmentType))
+
 	// check memory limit
 	concurrencyLevel := loader.cpuPool.Cap()
-	if len(req.Infos) > 0 && len(req.Infos[0].BinlogPaths) > 0 {
-		concurrencyLevel /= len(req.Infos[0].BinlogPaths)
-		if concurrencyLevel <= 0 {
-			concurrencyLevel = 1
-		}
+	if concurrencyLevel > segmentNum {
+		concurrencyLevel = segmentNum
 	}
 	for ; concurrencyLevel > 1; concurrencyLevel /= 2 {
 		err := loader.checkSegmentSize(req.CollectionID, req.Infos, concurrencyLevel)
@@ -166,9 +165,13 @@ func (loader *segmentLoader) loadSegment(req *querypb.LoadSegmentsRequest, segme
 
 		return nil
 	}
+
 	// start to load
 	// Make sure we can always benefit from concurrency, and not spawn too many idle goroutines
-	err = funcutil.ProcessFuncParallel(len(req.Infos),
+	log.Debug("start to load segments in parallel",
+		zap.Int("segmentNum", segmentNum),
+		zap.Int("concurrencyLevel", concurrencyLevel))
+	err = funcutil.ProcessFuncParallel(segmentNum,
 		concurrencyLevel,
 		loadSegmentFunc, "loadSegmentFunc")
 	if err != nil {
@@ -217,8 +220,10 @@ func (loader *segmentLoader) loadSegmentInternal(segment *Segment,
 	if segment.getType() == segmentTypeSealed {
 		fieldID2IndexInfo := make(map[int64]*querypb.FieldIndexInfo)
 		for _, indexInfo := range loadInfo.IndexInfos {
-			fieldID := indexInfo.FieldID
-			fieldID2IndexInfo[fieldID] = indexInfo
+			if indexInfo != nil && indexInfo.EnableIndex {
+				fieldID := indexInfo.FieldID
+				fieldID2IndexInfo[fieldID] = indexInfo
+			}
 		}
 
 		indexedFieldInfos := make(map[int64]*IndexedFieldInfo)
@@ -239,12 +244,14 @@ func (loader *segmentLoader) loadSegmentInternal(segment *Segment,
 		if err := loader.loadIndexedFieldData(segment, indexedFieldInfos); err != nil {
 			return err
 		}
+		if err := loader.loadSealedSegmentFields(segment, fieldBinlogs); err != nil {
+			return err
+		}
 	} else {
 		fieldBinlogs = loadInfo.BinlogPaths
-	}
-
-	if err := loader.loadFiledBinlogData(segment, fieldBinlogs); err != nil {
-		return err
+		if err := loader.loadGrowingSegmentFields(segment, fieldBinlogs); err != nil {
+			return err
+		}
 	}
 
 	if pkFieldID == common.InvalidFieldID {
@@ -275,7 +282,7 @@ func (loader *segmentLoader) filterPKStatsBinlogs(fieldBinlogs []*datapb.FieldBi
 	return result
 }
 
-func (loader *segmentLoader) loadFiledBinlogData(segment *Segment, fieldBinlogs []*datapb.FieldBinlog) error {
+func (loader *segmentLoader) loadGrowingSegmentFields(segment *Segment, fieldBinlogs []*datapb.FieldBinlog) error {
 	if len(fieldBinlogs) <= 0 {
 		return nil
 	}
@@ -290,7 +297,7 @@ func (loader *segmentLoader) loadFiledBinlogData(segment *Segment, fieldBinlogs
 		loadFutures = append(loadFutures, futures...)
 	}
 
-	// wait for async load result
+	// wait for async load results
 	blobs := make([]*storage.Blob, len(loadFutures))
 	for index, future := range loadFutures {
 		if !future.OK() {
@@ -328,14 +335,64 @@ func (loader *segmentLoader) loadFiledBinlogData(segment *Segment, fieldBinlogs
 		}
 
 		return loader.loadGrowingSegments(segment, rowIDData.(*storage.Int64FieldData).Data, utss, insertData)
-	case segmentTypeSealed:
-		return loader.loadSealedSegments(segment, insertData)
+
 	default:
-		err := errors.New(fmt.Sprintln("illegal segment type when load segment, collectionID = ", segment.collectionID))
+		err := fmt.Errorf("illegal segmentType=%v when load segment, collectionID=%v", segmentType, segment.collectionID)
 		return err
 	}
 }
 
+func (loader *segmentLoader) loadSealedSegmentFields(segment *Segment, fields []*datapb.FieldBinlog) error {
+	// Load fields concurrently
+	futures := make([]*concurrency.Future, 0, len(fields))
+	for _, field := range fields {
+		future := loader.loadSealedFieldAsync(segment, field)
+
+		futures = append(futures, future)
+	}
+
+	err := concurrency.AwaitAll(futures...)
+	if err != nil {
+		return err
+	}
+
+	log.Info("log field binlogs done",
+		zap.Int64("collection", segment.collectionID),
+		zap.Int64("segment", segment.segmentID),
+		zap.Any("fields", fields))
+
+	return nil
+}
+
+// async load field of sealed segment
+func (loader *segmentLoader) loadSealedFieldAsync(segment *Segment, field *datapb.FieldBinlog) *concurrency.Future {
+	iCodec := storage.InsertCodec{}
+
+	// Avoid consuming too much memory if no CPU worker ready,
+	// acquire a CPU worker before load field binlogs
+	return loader.cpuPool.Submit(func() (interface{}, error) {
+		futures := loader.loadFieldBinlogsAsync(field)
+
+		blobs := make([]*storage.Blob, len(futures))
+		for index, future := range futures {
+			if !future.OK() {
+				return nil, future.Err()
+			}
+
+			blob := future.Value().(*storage.Blob)
+			blobs[index] = blob
+		}
+
+		_, _, insertData, err := iCodec.Deserialize(blobs)
+		if err != nil {
+			log.Warn(err.Error())
+			return nil, err
+		}
+
+		return nil, loader.loadSealedSegments(segment, insertData)
+	})
+}
+
 // Load binlogs concurrently into memory from KV storage asyncly
 func (loader *segmentLoader) loadFieldBinlogsAsync(field *datapb.FieldBinlog) []*concurrency.Future {
 	futures := make([]*concurrency.Future, 0, len(field.Binlogs))
@@ -361,21 +418,13 @@ func (loader *segmentLoader) loadFieldBinlogsAsync(field *datapb.FieldBinlog) []
 
 func (loader *segmentLoader) loadIndexedFieldData(segment *Segment, vecFieldInfos map[int64]*IndexedFieldInfo) error {
 	for fieldID, fieldInfo := range vecFieldInfos {
-		if fieldInfo.indexInfo == nil || !fieldInfo.indexInfo.EnableIndex {
-			fieldBinlog := fieldInfo.fieldBinlog
-			err := loader.loadFiledBinlogData(segment, []*datapb.FieldBinlog{fieldBinlog})
-			if err != nil {
-				return err
-			}
-			log.Debug("load vector field's binlog data done", zap.Int64("segmentID", segment.ID()), zap.Int64("fieldID", fieldID))
-		} else {
-			indexInfo := fieldInfo.indexInfo
-			err := loader.loadFieldIndexData(segment, indexInfo)
-			if err != nil {
-				return err
-			}
-			log.Debug("load field's index data done", zap.Int64("segmentID", segment.ID()), zap.Int64("fieldID", fieldID))
+		indexInfo := fieldInfo.indexInfo
+		err := loader.loadFieldIndexData(segment, indexInfo)
+		if err != nil {
+			return err
 		}
+		log.Debug("load field's index data done", zap.Int64("segmentID", segment.ID()), zap.Int64("fieldID", fieldID))
+
 		segment.setIndexedFieldInfo(fieldID, fieldInfo)
 	}
 
@@ -767,7 +816,11 @@ func newSegmentLoader(
 		panic(err)
 	}
 
-	ioPool, err := concurrency.NewPool(cpuNum*2, ants.WithPreAlloc(true))
+	ioPoolSize := cpuNum * 2
+	if ioPoolSize < 32 {
+		ioPoolSize = 32
+	}
+	ioPool, err := concurrency.NewPool(ioPoolSize, ants.WithPreAlloc(true))
 	if err != nil {
 		log.Error("failed to create goroutine pool for segment loader",
 			zap.Error(err))
diff --git a/internal/querynode/segment_loader_test.go b/internal/querynode/segment_loader_test.go
index 9e85b6347f0e3d6e93873bd8cb79152042623274..7629ff8807f806beee0e1df9ee1646dbfe5b1b79 100644
--- a/internal/querynode/segment_loader_test.go
+++ b/internal/querynode/segment_loader_test.go
@@ -70,7 +70,7 @@ func TestSegmentLoader_loadSegment(t *testing.T) {
 			},
 		}
 
-		err = loader.loadSegment(req, segmentTypeSealed)
+		err = loader.LoadSegment(req, segmentTypeSealed)
 		assert.NoError(t, err)
 	})
 
@@ -101,7 +101,7 @@ func TestSegmentLoader_loadSegment(t *testing.T) {
 			},
 		}
 
-		err = loader.loadSegment(req, segmentTypeSealed)
+		err = loader.LoadSegment(req, segmentTypeSealed)
 		assert.Error(t, err)
 	})
 
@@ -114,7 +114,7 @@ func TestSegmentLoader_loadSegment(t *testing.T) {
 
 		req := &querypb.LoadSegmentsRequest{}
 
-		err = loader.loadSegment(req, segmentTypeSealed)
+		err = loader.LoadSegment(req, segmentTypeSealed)
 		assert.Error(t, err)
 	})
 }
@@ -182,7 +182,7 @@ func TestSegmentLoader_loadSegmentFieldsData(t *testing.T) {
 		binlog, _, err := saveBinLog(ctx, defaultCollectionID, defaultPartitionID, defaultSegmentID, defaultMsgLength, schema)
 		assert.NoError(t, err)
 
-		err = loader.loadFiledBinlogData(segment, binlog)
+		err = loader.loadSealedSegmentFields(segment, binlog)
 		assert.NoError(t, err)
 	}
 
@@ -235,7 +235,7 @@ func TestSegmentLoader_invalid(t *testing.T) {
 			},
 		}
 
-		err = loader.loadSegment(req, segmentTypeSealed)
+		err = loader.LoadSegment(req, segmentTypeSealed)
 		assert.Error(t, err)
 	})
 
@@ -273,7 +273,7 @@ func TestSegmentLoader_invalid(t *testing.T) {
 				},
 			},
 		}
-		err = loader.loadSegment(req, segmentTypeSealed)
+		err = loader.LoadSegment(req, segmentTypeSealed)
 		assert.Error(t, err)
 	})
 
@@ -298,7 +298,7 @@ func TestSegmentLoader_invalid(t *testing.T) {
 			},
 		}
 
-		err = loader.loadSegment(req, commonpb.SegmentState_Dropped)
+		err = loader.LoadSegment(req, commonpb.SegmentState_Dropped)
 		assert.Error(t, err)
 	})
 }
@@ -416,7 +416,7 @@ func TestSegmentLoader_testLoadGrowingAndSealed(t *testing.T) {
 			},
 		}
 
-		err = loader.loadSegment(req1, segmentTypeSealed)
+		err = loader.LoadSegment(req1, segmentTypeSealed)
 		assert.NoError(t, err)
 
 		segment1, err := loader.metaReplica.getSegmentByID(segmentID1, segmentTypeSealed)
@@ -442,7 +442,7 @@ func TestSegmentLoader_testLoadGrowingAndSealed(t *testing.T) {
 			},
 		}
 
-		err = loader.loadSegment(req2, segmentTypeSealed)
+		err = loader.LoadSegment(req2, segmentTypeSealed)
 		assert.NoError(t, err)
 
 		segment2, err := loader.metaReplica.getSegmentByID(segmentID2, segmentTypeSealed)
@@ -476,7 +476,7 @@ func TestSegmentLoader_testLoadGrowingAndSealed(t *testing.T) {
 			},
 		}
 
-		err = loader.loadSegment(req1, segmentTypeGrowing)
+		err = loader.LoadSegment(req1, segmentTypeGrowing)
 		assert.NoError(t, err)
 
 		segment1, err := loader.metaReplica.getSegmentByID(segmentID1, segmentTypeGrowing)
@@ -502,7 +502,7 @@ func TestSegmentLoader_testLoadGrowingAndSealed(t *testing.T) {
 			},
 		}
 
-		err = loader.loadSegment(req2, segmentTypeGrowing)
+		err = loader.LoadSegment(req2, segmentTypeGrowing)
 		assert.NoError(t, err)
 
 		segment2, err := loader.metaReplica.getSegmentByID(segmentID2, segmentTypeGrowing)
@@ -562,7 +562,7 @@ func TestSegmentLoader_testLoadSealedSegmentWithIndex(t *testing.T) {
 		},
 	}
 
-	err = loader.loadSegment(req, segmentTypeSealed)
+	err = loader.LoadSegment(req, segmentTypeSealed)
 	assert.NoError(t, err)
 
 	segment, err := node.metaReplica.getSegmentByID(segmentID, segmentTypeSealed)
diff --git a/internal/querynode/task.go b/internal/querynode/task.go
index 59fdabe681adda7a25357f8827f7b5da470a4e32..dd9f4ac1e165657d967f303e851b5eb0d20b1005 100644
--- a/internal/querynode/task.go
+++ b/internal/querynode/task.go
@@ -218,7 +218,7 @@ func (w *watchDmChannelsTask) Execute(ctx context.Context) (err error) {
 		zap.Int64("collectionID", collectionID),
 		zap.Int64s("unFlushedSegmentIDs", unFlushedSegmentIDs),
 	)
-	err = w.node.loader.loadSegment(req, segmentTypeGrowing)
+	err = w.node.loader.LoadSegment(req, segmentTypeGrowing)
 	if err != nil {
 		log.Warn(err.Error())
 		return err
@@ -524,7 +524,7 @@ func (l *loadSegmentsTask) PreExecute(ctx context.Context) error {
 func (l *loadSegmentsTask) Execute(ctx context.Context) error {
 	// TODO: support db
 	log.Info("LoadSegmentTask Execute start", zap.Int64("msgID", l.req.Base.MsgID))
-	err := l.node.loader.loadSegment(l.req, segmentTypeSealed)
+	err := l.node.loader.LoadSegment(l.req, segmentTypeSealed)
 	if err != nil {
 		log.Warn(err.Error())
 		return err
diff --git a/internal/util/concurrency/future.go b/internal/util/concurrency/future.go
index e6e736fa2d4e0eab25a9269de0b408ac8e04381d..babc62375e676b17ca7aad7d24c9b8413f7bb6c6 100644
--- a/internal/util/concurrency/future.go
+++ b/internal/util/concurrency/future.go
@@ -46,8 +46,8 @@ func (future *Future) Value() interface{} {
 	return future.value
 }
 
-// True if error occurred,
-// false otherwise.
+// False if error occurred,
+// true otherwise.
 func (future *Future) OK() bool {
 	<-future.ch