diff --git a/core/blockchain.go b/core/blockchain.go
index 6f1cdf3208..5c9a229937 100644
--- a/core/blockchain.go
+++ b/core/blockchain.go
@@ -57,8 +57,8 @@ var (
 )
 
 const (
-	bodyCacheLimit      = 256
-	blockCacheLimit     = 256
+	bodyCacheLimit      = 2560
+	blockCacheLimit     = 2560
 	maxFutureBlocks     = 256
 	maxTimeFutureBlocks = 30
 	badBlockLimit       = 10
diff --git a/eth/api_backend.go b/eth/api_backend.go
index 499653d1c6..856b5c62a6 100644
--- a/eth/api_backend.go
+++ b/eth/api_backend.go
@@ -18,8 +18,11 @@ package eth
 
 import (
 	"context"
+	"encoding/json"
 	"github.com/ethereum/go-ethereum/consensus/XDPoS"
+	"io/ioutil"
 	"math/big"
+	"path/filepath"
 
 	"github.com/ethereum/go-ethereum/accounts"
 	"github.com/ethereum/go-ethereum/common"
@@ -241,6 +244,18 @@ func (s *EthApiBackend) GetRewardByHash(hash common.Hash) map[string]interface{}
 		if rewards != nil {
 			return rewards
 		}
+	} else {
+		header := s.eth.blockchain.GetHeaderByHash(hash)
+		if header != nil {
+			data, err := ioutil.ReadFile(filepath.Join(s.eth.config.StoreRewardFolder, header.Number.String()+"."+header.Hash().Hex()))
+			if err == nil {
+				rewards := make(map[string]interface{})
+				err = json.Unmarshal(data, &rewards)
+				if err == nil {
+					return rewards
+				}
+			}
+		}
 	}
 	return make(map[string]interface{})
 }
\ No newline at end of file
diff --git a/miner/worker.go b/miner/worker.go
index b626805043..9e5fb6ef54 100644
--- a/miner/worker.go
+++ b/miner/worker.go
@@ -613,12 +613,13 @@ func (self *worker) commitNewWork() {
 			delete(self.possibleUncles, hash)
 		}
 	}
-	// Create the new block to seal with the consensus engine
-	if work.Block, err = self.engine.Finalize(self.chain, header, work.state, work.txs, uncles, work.receipts); err != nil {
-		log.Error("Failed to finalize block for sealing", "err", err)
-		return
-	}
-	if atomic.LoadInt32(&self.mining) == 1 {
+        if atomic.LoadInt32(&self.mining) == 1 {
+		// Create the new block to seal with the consensus engine
+		if work.Block, err = self.engine.Finalize(self.chain, header, work.state, work.txs, uncles, work.receipts); err != nil {
+			log.Error("Failed to finalize block for sealing", "err", err)
+			return
+		}
+		}
 		log.Info("Committing new block", "number", work.Block.Number(), "txs", work.tcount, "special txs", len(specialTxs), "uncles", len(uncles), "elapsed", common.PrettyDuration(time.Since(tstart)))
 		self.unconfirmed.Shift(work.Block.NumberU64() - 1)
 		self.lastParentBlockCommit = parent.Hash().Hex()