diff --git a/src/main/java/com/actiontech/dble/services/BackendService.java b/src/main/java/com/actiontech/dble/services/BackendService.java
index 6879f5924..bf3207688 100644
--- a/src/main/java/com/actiontech/dble/services/BackendService.java
+++ b/src/main/java/com/actiontech/dble/services/BackendService.java
@@ -131,7 +131,7 @@ public abstract class BackendService extends AbstractService {
             handleDataError(e);
         } finally {
             isHandling.set(false);
-            if (taskQueue.size() > 0) {
+            if (!taskQueue.isEmpty()) {
                 doHandle(task);
             }
         }
@@ -232,7 +232,7 @@ public abstract class BackendService extends AbstractService {
     protected void handleDataError(Exception e) {
         LOGGER.warn(this.toString() + " handle data error:", e);
         connection.close("handle data error:" + e.getMessage());
-        while (taskQueue.size() > 0) {
+        while (!taskQueue.isEmpty()) {
             clearTaskQueue();
             readSize.set(0);
             // clear all data from the client
@@ -674,8 +674,8 @@ public abstract class BackendService extends AbstractService {
                 handleDataError(e);
             } finally {
                 isHandling.set(false);
-                if (taskQueue.size() > 0) {
-                    doHandle(null);
+                if (!taskQueue.isEmpty()) {
+                    doHandle(taskQueue.peek());
                 }
             }
         }
diff --git a/src/main/java/com/actiontech/dble/services/mysqlsharding/MySQLResponseService.java b/src/main/java/com/actiontech/dble/services/mysqlsharding/MySQLResponseService.java
index 9ce063064..18fc345b8 100644
--- a/src/main/java/com/actiontech/dble/services/mysqlsharding/MySQLResponseService.java
+++ b/src/main/java/com/actiontech/dble/services/mysqlsharding/MySQLResponseService.java
@@ -528,7 +528,7 @@ public class MySQLResponseService extends BackendService {
     @Override
     protected Executor getExecutor() {
         Executor executor;
-        if (complexQuery) {
+        if (complexQuery || SystemConfig.getInstance().getUsePerformanceMode() == 1) {
             executor = DbleServer.getInstance().getComplexQueryExecutor();
         } else {
             executor = DbleServer.getInstance().getBackendExecutor();