diff --git a/include/libs/transport/trpc.h b/include/libs/transport/trpc.h
index 467f0a9ff0..655c903c0b 100644
--- a/include/libs/transport/trpc.h
+++ b/include/libs/transport/trpc.h
@@ -47,8 +47,6 @@ typedef struct SRpcHandleInfo {
   int8_t  persistHandle;  // persist handle or not
   int8_t  hasEpSet;
 
-  STraceId traceId;
-
   // app info
   void *ahandle;  // app handle set by client
   void *wrapper;  // wrapper handle
@@ -58,7 +56,8 @@ typedef struct SRpcHandleInfo {
   void   *rsp;
   int32_t rspLen;
 
-  // conn info
+  STraceId traceId;
+
   SRpcConnInfo conn;
 } SRpcHandleInfo;
 
diff --git a/include/util/tdef.h b/include/util/tdef.h
index f4e3385651..6fbec4bc67 100644
--- a/include/util/tdef.h
+++ b/include/util/tdef.h
@@ -396,7 +396,7 @@ typedef enum ELogicConditionType {
 #ifdef WINDOWS
 #define TSDB_MAX_RPC_THREADS 4  // windows pipe only support 4 connections.
 #else
-#define TSDB_MAX_RPC_THREADS 5
+#define TSDB_MAX_RPC_THREADS 10
 #endif
 
 #define TSDB_QUERY_TYPE_NON_TYPE      0x00u  // none type
diff --git a/source/libs/transport/inc/transComm.h b/source/libs/transport/inc/transComm.h
index a9326ca429..04b58da570 100644
--- a/source/libs/transport/inc/transComm.h
+++ b/source/libs/transport/inc/transComm.h
@@ -128,7 +128,7 @@ typedef struct {
 
   int8_t retryCnt;
   int8_t retryLimit;
-  // bool       setMaxRetry;
+
   STransCtx  appCtx;  //
   STransMsg* pRsp;    // for synchronous API
   tsem_t*    pSem;    // for synchronous API
@@ -195,17 +195,7 @@ typedef enum { ConnNormal, ConnAcquire, ConnRelease, ConnBroken, ConnInPool } Co
 
 #define transLabel(trans) ((STrans*)trans)->label
 
-// int  rpcAuthenticateMsg(void* pMsg, int msgLen, void* pAuth, void* pKey);
-// void rpcBuildAuthHead(void* pMsg, int msgLen, void* pAuth, void* pKey);
-//// int32_t rpcCompressRpcMsg(char* pCont, int32_t contLen);
-//
-// int  transAuthenticateMsg(void* pMsg, int msgLen, void* pAuth, void* pKey);
-// void transBuildAuthHead(void* pMsg, int msgLen, void* pAuth, void* pKey);
-// bool transCompressMsg(char* msg, int32_t len, int32_t* flen);
-// bool transDecompressMsg(char* msg, int32_t len, int32_t* flen);
-
 void transFreeMsg(void* msg);
-
 //
 typedef struct SConnBuffer {
   char* buf;
@@ -322,8 +312,8 @@ void* transCtxDumpBrokenlinkVal(STransCtx* ctx, int32_t* msgType);
 
 // request list
 typedef struct STransReq {
-  queue q;
-  void* data;
+  queue      q;
+  uv_write_t wreq;
 } STransReq;
 
 void  transReqQueueInit(queue* q);
diff --git a/source/libs/transport/src/transCli.c b/source/libs/transport/src/transCli.c
index 31d567a2ed..47d47d3dbe 100644
--- a/source/libs/transport/src/transCli.c
+++ b/source/libs/transport/src/transCli.c
@@ -16,7 +16,8 @@
 #include "transComm.h"
 
 typedef struct SConnList {
-  queue conn;
+  queue   conn;
+  int32_t size;
 } SConnList;
 
 typedef struct SCliConn {
@@ -339,8 +340,8 @@ void cliHandleResp(SCliConn* conn) {
       tDebug("%s conn %p stop timer", CONN_GET_INST_LABEL(conn), conn);
       uv_timer_stop(conn->timer);
     }
-    conn->timer->data = NULL;
     taosArrayPush(pThrd->timerList, &conn->timer);
+    conn->timer->data = NULL;
     conn->timer = NULL;
   }
 
@@ -510,7 +511,7 @@ static SCliConn* getConnFromPool(void* pool, char* ip, uint32_t port) {
   SHashObj*  pPool = pool;
   SConnList* plist = taosHashGet(pPool, key, strlen(key));
   if (plist == NULL) {
-    SConnList list;
+    SConnList list = {0};
     taosHashPut(pPool, key, strlen(key), (void*)&list, sizeof(list));
     plist = taosHashGet(pPool, key, strlen(key));
     QUEUE_INIT(&plist->conn);
@@ -519,15 +520,18 @@ static SCliConn* getConnFromPool(void* pool, char* ip, uint32_t port) {
   if (QUEUE_IS_EMPTY(&plist->conn)) {
     return NULL;
   }
+
+  plist->size -= 1;
   queue*    h = QUEUE_HEAD(&plist->conn);
   SCliConn* conn = QUEUE_DATA(h, SCliConn, q);
   conn->status = ConnNormal;
   QUEUE_REMOVE(&conn->q);
   QUEUE_INIT(&conn->q);
 
-  transDQCancel(((SCliThrd*)conn->hostThrd)->timeoutQueue, conn->task);
-  conn->task = NULL;
-
+  if (conn->task != NULL) {
+    transDQCancel(((SCliThrd*)conn->hostThrd)->timeoutQueue, conn->task);
+    conn->task = NULL;
+  }
   return conn;
 }
 static void addConnToPool(void* pool, SCliConn* conn) {
@@ -539,6 +543,13 @@ static void addConnToPool(void* pool, SCliConn* conn) {
 
   allocConnRef(conn, true);
 
+  if (conn->timer != NULL) {
+    uv_timer_stop(conn->timer);
+    taosArrayPush(thrd->timerList, &conn->timer);
+    conn->timer->data = NULL;
+    conn->timer = NULL;
+  }
+
   STrans* pTransInst = thrd->pTransInst;
   cliReleaseUnfinishedMsg(conn);
   transQueueClear(&conn->cliMsgs);
@@ -556,13 +567,17 @@ static void addConnToPool(void* pool, SCliConn* conn) {
   assert(conn->list != NULL);
   QUEUE_INIT(&conn->q);
   QUEUE_PUSH(&conn->list->conn, &conn->q);
+  conn->list->size += 1;
 
+  conn->task = NULL;
   assert(!QUEUE_IS_EMPTY(&conn->list->conn));
 
-  STaskArg* arg = taosMemoryCalloc(1, sizeof(STaskArg));
-  arg->param1 = conn;
-  arg->param2 = thrd;
-  conn->task = transDQSched(thrd->timeoutQueue, doCloseIdleConn, arg, CONN_PERSIST_TIME(pTransInst->idleTime));
+  if (conn->list->size >= 50) {
+    STaskArg* arg = taosMemoryCalloc(1, sizeof(STaskArg));
+    arg->param1 = conn;
+    arg->param2 = thrd;
+    conn->task = transDQSched(thrd->timeoutQueue, doCloseIdleConn, arg, CONN_PERSIST_TIME(pTransInst->idleTime));
+  }
 }
 static int32_t allocConnRef(SCliConn* conn, bool update) {
   if (update) {
@@ -1374,7 +1389,7 @@ int transReleaseCliHandle(void* handle) {
   }
 
   STransMsg tmsg = {.info.handle = handle};
-  TRACE_SET_MSGID(&tmsg.info.traceId, tGenIdPI64());
+  // TRACE_SET_MSGID(&tmsg.info.traceId, tGenIdPI64());
 
   SCliMsg* cmsg = taosMemoryCalloc(1, sizeof(SCliMsg));
   cmsg->msg = tmsg;
@@ -1415,7 +1430,6 @@ int transSendRequest(void* shandle, const SEpSet* pEpSet, STransMsg* pReq, STran
   if (ctx != NULL) {
     pCtx->appCtx = *ctx;
   }
-  assert(pTransInst->connType == TAOS_CONN_CLIENT);
 
   SCliMsg* cliMsg = taosMemoryCalloc(1, sizeof(SCliMsg));
   cliMsg->ctx = pCtx;
diff --git a/source/libs/transport/src/transComm.c b/source/libs/transport/src/transComm.c
index ed694e120a..b568163e23 100644
--- a/source/libs/transport/src/transComm.c
+++ b/source/libs/transport/src/transComm.c
@@ -23,33 +23,6 @@ static TdThreadOnce transModuleInit = PTHREAD_ONCE_INIT;
 static int32_t refMgt;
 static int32_t instMgt;
 
-int transAuthenticateMsg(void* pMsg, int msgLen, void* pAuth, void* pKey) {
-  T_MD5_CTX context;
-  int       ret = -1;
-
-  tMD5Init(&context);
-  tMD5Update(&context, (uint8_t*)pKey, TSDB_PASSWORD_LEN);
-  tMD5Update(&context, (uint8_t*)pMsg, msgLen);
-  tMD5Update(&context, (uint8_t*)pKey, TSDB_PASSWORD_LEN);
-  tMD5Final(&context);
-
-  if (memcmp(context.digest, pAuth, sizeof(context.digest)) == 0) ret = 0;
-
-  return ret;
-}
-
-void transBuildAuthHead(void* pMsg, int msgLen, void* pAuth, void* pKey) {
-  T_MD5_CTX context;
-
-  tMD5Init(&context);
-  tMD5Update(&context, (uint8_t*)pKey, TSDB_PASSWORD_LEN);
-  tMD5Update(&context, (uint8_t*)pMsg, msgLen);
-  tMD5Update(&context, (uint8_t*)pKey, TSDB_PASSWORD_LEN);
-  tMD5Final(&context);
-
-  memcpy(pAuth, context.digest, sizeof(context.digest));
-}
-
 bool transCompressMsg(char* msg, int32_t len, int32_t* flen) {
   return false;
   // SRpcHead* pHead = rpcHeadFromCont(pCont);
@@ -176,7 +149,6 @@ int transAllocBuffer(SConnBuffer* connBuf, uv_buf_t* uvBuf) {
    * info--->|
    */
   SConnBuffer* p = connBuf;
-
   uvBuf->base = p->buf + p->len;
   if (p->left == -1) {
     uvBuf->len = p->cap - p->len;
@@ -184,7 +156,8 @@ int transAllocBuffer(SConnBuffer* connBuf, uv_buf_t* uvBuf) {
     if (p->left < p->cap - p->len) {
       uvBuf->len = p->left;
     } else {
-      p->buf = taosMemoryRealloc(p->buf, p->left + p->len);
+      p->cap = p->left + p->len;
+      p->buf = taosMemoryRealloc(p->buf, p->cap);
       uvBuf->base = p->buf + p->len;
       uvBuf->len = p->left;
     }
@@ -266,14 +239,9 @@ int transAsyncSend(SAsyncPool* pool, queue* q) {
   uv_async_t* async = &(pool->asyncs[idx]);
   SAsyncItem* item = async->data;
 
-  int64_t st = taosGetTimestampUs();
   taosThreadMutexLock(&item->mtx);
   QUEUE_PUSH(&item->qmsg, q);
   taosThreadMutexUnlock(&item->mtx);
-  int64_t el = taosGetTimestampUs() - st;
-  if (el > 50) {
-    // tInfo("lock and unlock cost:%d", (int)el);
-  }
   return uv_async_send(async);
 }
 
@@ -349,30 +317,21 @@ void transReqQueueInit(queue* q) {
   QUEUE_INIT(q);
 }
 void* transReqQueuePush(queue* q) {
-  uv_write_t* req = taosMemoryCalloc(1, sizeof(uv_write_t));
-  STransReq*  wreq = taosMemoryCalloc(1, sizeof(STransReq));
-  wreq->data = req;
-  req->data = wreq;
-  QUEUE_PUSH(q, &wreq->q);
-  return req;
+  STransReq* req = taosMemoryCalloc(1, sizeof(STransReq));
+  req->wreq.data = req;
+  QUEUE_PUSH(q, &req->q);
+  return &req->wreq;
 }
 void* transReqQueueRemove(void* arg) {
   void*       ret = NULL;
-  uv_write_t* req = arg;
-  STransReq*  wreq = req && req->data ? req->data : NULL;
+  uv_write_t* wreq = arg;
 
-  assert(wreq->data == req);
-  if (wreq == NULL || wreq->data == NULL) {
-    taosMemoryFree(wreq->data);
-    taosMemoryFree(wreq);
-    return req;
-  }
+  STransReq* req = wreq ? wreq->data : NULL;
+  if (req == NULL) return NULL;
+  QUEUE_REMOVE(&req->q);
 
-  QUEUE_REMOVE(&wreq->q);
-
-  ret = req && req->handle ? req->handle->data : NULL;
-  taosMemoryFree(wreq->data);
-  taosMemoryFree(wreq);
+  ret = wreq && wreq->handle ? wreq->handle->data : NULL;
+  taosMemoryFree(req);
 
   return ret;
 }
@@ -381,7 +340,6 @@ void transReqQueueClear(queue* q) {
     queue* h = QUEUE_HEAD(q);
     QUEUE_REMOVE(h);
     STransReq* req = QUEUE_DATA(h, STransReq, q);
-    taosMemoryFree(req->data);
     taosMemoryFree(req);
   }
 }
diff --git a/source/libs/transport/src/transSvr.c b/source/libs/transport/src/transSvr.c
index 8b27d95e52..14b8b35478 100644
--- a/source/libs/transport/src/transSvr.c
+++ b/source/libs/transport/src/transSvr.c
@@ -75,7 +75,6 @@ typedef struct SWorkThrd {
   SAsyncPool*   asyncPool;
   uv_prepare_t* prepare;
   queue         msg;
-  TdThreadMutex msgMtx;
 
   queue conn;
   void* pTransInst;
@@ -499,6 +498,7 @@ void uvWorkerAsyncCb(uv_async_t* handle) {
       tError("unexcept occurred, continue");
       continue;
     }
+
     // release handle to rpc init
     if (msg->type == Quit) {
       (*transAsyncHandle[msg->type])(msg, pThrd);
@@ -743,7 +743,6 @@ static bool addHandleToWorkloop(SWorkThrd* pThrd, char* pipeName) {
   pThrd->pipe->data = pThrd;
 
   QUEUE_INIT(&pThrd->msg);
-  taosThreadMutexInit(&pThrd->msgMtx, NULL);
 
   pThrd->prepare = taosMemoryCalloc(1, sizeof(uv_prepare_t));
   uv_prepare_init(pThrd->loop, pThrd->prepare);
diff --git a/source/libs/transport/test/svrBench.c b/source/libs/transport/test/svrBench.c
index 224f527385..6eb80c8504 100644
--- a/source/libs/transport/test/svrBench.c
+++ b/source/libs/transport/test/svrBench.c
@@ -75,15 +75,14 @@ void processShellMsg() {
 
       void *handle = pRpcMsg->info.handle;
       taosFreeQitem(pRpcMsg);
-
-      {
-        SRpcMsg nRpcMsg = {0};
-        nRpcMsg.pCont = rpcMallocCont(msgSize);
-        nRpcMsg.contLen = msgSize;
-        nRpcMsg.info.handle = handle;
-        nRpcMsg.code = TSDB_CODE_CTG_NOT_READY;
-        rpcSendResponse(&nRpcMsg);
-      }
+      //{
+      //  SRpcMsg nRpcMsg = {0};
+      //  nRpcMsg.pCont = rpcMallocCont(msgSize);
+      //  nRpcMsg.contLen = msgSize;
+      //  nRpcMsg.info.handle = handle;
+      //  nRpcMsg.code = TSDB_CODE_CTG_NOT_READY;
+      //  rpcSendResponse(&nRpcMsg);
+      //}
     }
 
     taosUpdateItemSize(qinfo.queue, numOfMsgs);
diff --git a/source/util/src/tref.c b/source/util/src/tref.c
index 9cd849b9be..c984ef3f34 100644
--- a/source/util/src/tref.c
+++ b/source/util/src/tref.c
@@ -44,11 +44,11 @@ typedef struct {
   void (*fp)(void *);
 } SRefSet;
 
-static SRefSet         tsRefSetList[TSDB_REF_OBJECTS];
+static SRefSet       tsRefSetList[TSDB_REF_OBJECTS];
 static TdThreadOnce  tsRefModuleInit = PTHREAD_ONCE_INIT;
 static TdThreadMutex tsRefMutex;
-static int32_t         tsRefSetNum = 0;
-static int32_t         tsNextId = 0;
+static int32_t       tsRefSetNum = 0;
+static int32_t       tsNextId = 0;
 
 static void    taosInitRefModule(void);
 static void    taosLockList(int64_t *lockedBy);