diff --git a/core/rawdb/freezer_batch.go b/core/rawdb/freezer_batch.go
index 99b63df4dc..e270ee08ec 100644
--- a/core/rawdb/freezer_batch.go
+++ b/core/rawdb/freezer_batch.go
@@ -201,6 +201,7 @@ func (batch *freezerTableBatch) commit() error {
 
 	// Update headBytes of table.
 	batch.t.headBytes += dataSize
+	items := batch.curItem - batch.t.items.Load()
 	batch.t.items.Store(batch.curItem)
 
 	// Update metrics.
@@ -208,7 +209,9 @@ func (batch *freezerTableBatch) commit() error {
 	batch.t.writeMeter.Mark(dataSize + indexSize)
 
 	// Periodically sync the table, todo (rjl493456442) make it configurable?
-	if time.Since(batch.t.lastSync) > 30*time.Second {
+	batch.t.uncommit += items
+	if batch.t.uncommit > 256 && time.Since(batch.t.lastSync) > 30*time.Second {
+		batch.t.uncommit = 0
 		batch.t.lastSync = time.Now()
 		return batch.t.Sync()
 	}
diff --git a/core/rawdb/freezer_table.go b/core/rawdb/freezer_table.go
index 3900b5d558..431f65ee81 100644
--- a/core/rawdb/freezer_table.go
+++ b/core/rawdb/freezer_table.go
@@ -113,6 +113,7 @@ type freezerTable struct {
 	tailId uint32              // number of the earliest file
 
 	metadata *freezerTableMeta // metadata of the table
+	uncommit uint64            // Count of items written without flushing to file
 	lastSync time.Time         // Timestamp when the last sync was performed
 
 	headBytes  int64          // Number of bytes written to the head file