diff --git a/chunk.go b/chunk.go
index 2d097a8..261d3ac 100644
--- a/chunk.go
+++ b/chunk.go
@@ -42,6 +42,8 @@ func (cc *commPCallback) OnSuccess(buf *Buffer, graphName, payloadCid, fsDetail
 	carFilePath := filepath.Join(cc.carDir, cpRes.Root.String())
 	carFileNameWithSuffix := carFilePath + ".car"
 
+	log.Infof("start write car to tile")
+	writeStart := time.Now()
 	carFile, err := os.OpenFile(carFileNameWithSuffix, os.O_RDWR|os.O_CREATE, 0o644)
 	if err != nil {
 		log.Fatalf("failed to create car file: %s", err)
@@ -52,6 +54,7 @@ func (cc *commPCallback) OnSuccess(buf *Buffer, graphName, payloadCid, fsDetail
 	}
 	buf.Reset()
 	carFile.Close()
+	log.Infof("end write car to file: %v", time.Since(writeStart))
 
 	if cc.rename {
 		if err := os.Rename(carFileNameWithSuffix, carFilePath); err != nil {
diff --git a/utils.go b/utils.go
index 6508579..6d0ef57 100644
--- a/utils.go
+++ b/utils.go
@@ -143,6 +143,10 @@ func BuildIpldGraph(ctx context.Context,
 	graphName string,
 	params *ChunkParams,
 ) {
+	start := time.Now()
+	defer func() {
+		log.Infof("BuildIpldGraph took: %v", time.Since(start))
+	}()
 	buf, payloadCid, fsDetail, err := buildIpldGraph(ctx, fileList, params.ParentPath, params.Parallel,
 		params.ExpectSliceSize, params.Ef, params.SkipFilename)
 	if err != nil {