diff --git a/core/blockchain_diff_test.go b/core/blockchain_diff_test.go
index d44ba0465b..7df2612b35 100644
--- a/core/blockchain_diff_test.go
+++ b/core/blockchain_diff_test.go
@@ -117,15 +117,15 @@ func rawDataToDiffLayer(data rlp.RawValue) (*types.DiffLayer, error) {
 	hasher.Write(data)
 	var diffHash common.Hash
 	hasher.Sum(diffHash[:0])
-	hasher.Reset()
 	diff.DiffHash = diffHash
+	hasher.Reset()
 	return &diff, nil
 }
 
 func TestProcessDiffLayer(t *testing.T) {
 	t.Parallel()
 
-	blockNum := maxDiffLimit - 1
+	blockNum := 128
 	fullBackend := newTestBackend(blockNum, false)
 	falseDiff := 5
 	defer fullBackend.close()
diff --git a/core/state/statedb.go b/core/state/statedb.go
index 382d73d81a..886f181bf5 100644
--- a/core/state/statedb.go
+++ b/core/state/statedb.go
@@ -39,8 +39,9 @@ import (
 )
 
 const (
-	preLoadLimit      = 128
-	defaultNumOfSlots = 100
+	preLoadLimit              = 128
+	defaultNumOfSlots         = 100
+	minNumberOfAccountPerTask = 5
 )
 
 type revision struct {
@@ -558,7 +559,7 @@ func (s *StateDB) TryPreload(block *types.Block, signer types.Signer) {
 			accounts[*tx.To()] = true
 		}
 	}
-	for account, _ := range accounts {
+	for account := range accounts {
 		accountsSlice = append(accountsSlice, account)
 	}
 	if len(accountsSlice) >= preLoadLimit && len(accountsSlice) > runtime.NumCPU() {
@@ -1081,52 +1082,127 @@ func (s *StateDB) clearJournalAndRefund() {
 	s.validRevisions = s.validRevisions[:0] // Snapshots can be created without journal entires
 }
 
-func (s *StateDB) LightCommit() (common.Hash, *types.DiffLayer, error) {
+func (s *StateDB) LightCommit(root common.Hash) (common.Hash, *types.DiffLayer, error) {
 	codeWriter := s.db.TrieDB().DiskDB().NewBatch()
 
-	// Step1 write code
-	for codeHash, code := range s.diffCode {
-		rawdb.WriteCode(codeWriter, codeHash, code)
-		if codeWriter.ValueSize() >= ethdb.IdealBatchSize {
-			if err := codeWriter.Write(); err != nil {
-				return common.Hash{}, nil, err
+	commitFuncs := []func() error{
+		func() error {
+			for codeHash, code := range s.diffCode {
+				rawdb.WriteCode(codeWriter, codeHash, code)
+				if codeWriter.ValueSize() >= ethdb.IdealBatchSize {
+					if err := codeWriter.Write(); err != nil {
+						return err
+					}
+					codeWriter.Reset()
+				}
+			}
+			if codeWriter.ValueSize() > 0 {
+				if err := codeWriter.Write(); err != nil {
+					return err
+				}
+			}
+			return nil
+		},
+		func() error {
+			tasks := make(chan func())
+			taskResults := make(chan error, len(s.diffTries))
+			tasksNum := 0
+			finishCh := make(chan struct{})
+			defer close(finishCh)
+			threads := 1
+			if len(s.diffTries)/runtime.NumCPU() > minNumberOfAccountPerTask {
+				threads = runtime.NumCPU()
+			}
+			for i := 0; i < threads; i++ {
+				go func() {
+					for {
+						select {
+						case task := <-tasks:
+							task()
+						case <-finishCh:
+							return
+						}
+					}
+				}()
 			}
-			codeWriter.Reset()
-		}
-	}
-	if codeWriter.ValueSize() > 0 {
-		if err := codeWriter.Write(); err != nil {
-			return common.Hash{}, nil, err
-		}
-	}
 
-	// Step2 commit account storage
-	for account, diff := range s.diffTries {
-		root, err := diff.Commit(nil)
-		if err != nil {
-			return common.Hash{}, nil, err
-		}
-		s.db.CacheStorage(crypto.Keccak256Hash(account[:]), root, diff)
-	}
+			for account, diff := range s.diffTries {
+				tmpAccount := account
+				tmpDiff := diff
+				tasks <- func() {
+					root, err := tmpDiff.Commit(nil)
+					if err != nil {
+						taskResults <- err
+						return
+					}
+					s.db.CacheStorage(crypto.Keccak256Hash(tmpAccount[:]), root, tmpDiff)
+					taskResults <- nil
+					return
+				}
+				tasksNum++
+			}
+
+			for i := 0; i < tasksNum; i++ {
+				err := <-taskResults
+				if err != nil {
+					return err
+				}
+			}
 
-	// Step3 commit account trie
-	var account Account
-	root, err := s.trie.Commit(func(_ [][]byte, _ []byte, leaf []byte, parent common.Hash) error {
-		if err := rlp.DecodeBytes(leaf, &account); err != nil {
+			// commit account trie
+			var account Account
+			root, err := s.trie.Commit(func(_ [][]byte, _ []byte, leaf []byte, parent common.Hash) error {
+				if err := rlp.DecodeBytes(leaf, &account); err != nil {
+					return nil
+				}
+				if account.Root != emptyRoot {
+					s.db.TrieDB().Reference(account.Root, parent)
+				}
+				return nil
+			})
+			if err != nil {
+				return err
+			}
+			if root != emptyRoot {
+				s.db.CacheAccount(root, s.trie)
+			}
 			return nil
-		}
-		if account.Root != emptyRoot {
-			s.db.TrieDB().Reference(account.Root, parent)
-		}
-		return nil
-	})
-	if err != nil {
-		return common.Hash{}, nil, err
+		},
+		func() error {
+			if s.snap != nil {
+				if metrics.EnabledExpensive {
+					defer func(start time.Time) { s.SnapshotCommits += time.Since(start) }(time.Now())
+				}
+				// Only update if there's a state transition (skip empty Clique blocks)
+				if parent := s.snap.Root(); parent != root {
+					if err := s.snaps.Update(root, parent, s.snapDestructs, s.snapAccounts, s.snapStorage); err != nil {
+						log.Warn("Failed to update snapshot tree", "from", parent, "to", root, "err", err)
+					}
+					// Keep n diff layers in the memory
+					// - head layer is paired with HEAD state
+					// - head-1 layer is paired with HEAD-1 state
+					// - head-(n-1) layer(bottom-most diff layer) is paired with HEAD-(n-1)state
+					if err := s.snaps.Cap(root, s.snaps.CapLimit()); err != nil {
+						log.Warn("Failed to cap snapshot tree", "root", root, "layers", s.snaps.CapLimit(), "err", err)
+					}
+				}
+			}
+			return nil
+		},
+	}
+	commitRes := make(chan error, len(commitFuncs))
+	for _, f := range commitFuncs {
+		tmpFunc := f
+		go func() {
+			commitRes <- tmpFunc()
+		}()
 	}
-	if root != emptyRoot {
-		s.db.CacheAccount(root, s.trie)
+	for i := 0; i < len(commitFuncs); i++ {
+		r := <-commitRes
+		if r != nil {
+			return common.Hash{}, nil, r
+		}
 	}
-
 	s.snap, s.snapDestructs, s.snapAccounts, s.snapStorage = nil, nil, nil, nil
 	s.diffTries, s.diffCode = nil, nil
 	return root, s.diffLayer, nil
@@ -1140,7 +1216,7 @@ func (s *StateDB) Commit(deleteEmptyObjects bool) (common.Hash, *types.DiffLayer
 	// Finalize any pending changes and merge everything into the tries
 	root := s.IntermediateRoot(deleteEmptyObjects)
 	if s.lightProcessed {
-		return s.LightCommit()
+		return s.LightCommit(root)
 	}
 	var diffLayer *types.DiffLayer
 	if s.snap != nil {
diff --git a/core/state_processor.go b/core/state_processor.go
index c281263975..ecb28a23ea 100644
--- a/core/state_processor.go
+++ b/core/state_processor.go
@@ -43,7 +43,7 @@ import (
 
 const (
 	fullProcessCheck          = 21 // On diff sync mode, will do full process every fullProcessCheck randomly
-	minNumberOfAccountPerTask = 10
+	minNumberOfAccountPerTask = 5
 )
 
 // StateProcessor is a basic Processor, which takes care of transitioning