{'wxdata_perf_monitor_level':'1','wxdata_perf_cost_time':'16996','wxdata_perf_extra_info1':'{"transportRttEstimate":101,"domainLookUpStart":1701237146075,"responseEnd":1701237163055,"sendBytesCount":651,"redirectStart":0,"connectEnd":1701237146133,"protocol":"http/1.1","peerIP":"47.116.10.214","requestStart":1701237146075,"socketReused":false,"fetchStart":1701237146074,"SSLconnectionStart":1701237146083,"estimate_nettype":5,"httpRttEstimate":101,"throughputKbps":0,"SSLconnectionEnd":1701237146133,"downstreamThroughputKbpsEstimate":1961,"domainLookUpEnd":1701237146075,"responseStart":1701237163047,"redirectEnd":0,"rtt":53,"connectStart":1701237146075,"port":8080,"receivedBytedCount":365,"requestEnd":1701237163054}','wxdata_perf_monitor_id':'xm-bulky-purchaser/product/getTradePeriod','wxdata_perf_error_code':'0'}

wxdata_perf_extra_info1对象是wx.requset返回success的profile，通过微信的基础监控上报的，但是在本地调试时未遇到过这么久延迟问题

其中requestStart到requestEnd耗时16979 毫秒，这是什么原因呢？