diff --git a/lightning/config/config.go b/lightning/config/config.go
index 37ad64fa8..24d6ea368 100644
--- a/lightning/config/config.go
+++ b/lightning/config/config.go
@@ -156,7 +156,7 @@ func NewConfig() *Config {
 	return &Config{
 		App: Lightning{
 			RegionConcurrency: runtime.NumCPU(),
-			TableConcurrency:  8,
+			TableConcurrency:  6,
 			IndexConcurrency:  2,
 			IOConcurrency:     5,
 			CheckRequirements: true,
diff --git a/tidb-lightning.toml b/tidb-lightning.toml
index af1b23710..8e49e66f5 100644
--- a/tidb-lightning.toml
+++ b/tidb-lightning.toml
@@ -10,7 +10,7 @@ pprof-port = 8289
 # index-concurrency controls the maximum handled index concurrently while reading Mydumper SQL files. It can affect the tikv-importer disk usage.
 index-concurrency = 2
 # table-concurrency controls the maximum handled tables concurrently while reading Mydumper SQL files. It can affect the tikv-importer memory usage.
-table-concurrency = 8
+table-concurrency = 6
 # region-concurrency changes the concurrency number of data. It is set to the number of logical CPU cores by default and needs no configuration.
 # In mixed configuration, you can set it to 75% of the size of logical CPU cores.
 # region-concurrency default to runtime.NumCPU()