简单的请求长时间停滞在chrome中

Question

这是一个简单的get请求，它返回两个小文件。内容下载2.71毫秒。但是，请求完成时间是4.15秒。 Chrome工具显示请求已停止。这不是排队的，这个连接少于6个。停滞的原因是什么？

  t=88458 [st=  16]      HTTP_CACHE_CREATE_ENTRY  [dt=0]
t=88458 [st=  16]      HTTP_CACHE_ADD_TO_ENTRY  [dt=0]
t=88458 [st=  16]     +HTTP_STREAM_REQUEST  [dt=3408]
t=88458 [st=  16]        HTTP_STREAM_JOB_CONTROLLER_BOUND
                         --> source_dependency = 532266 (HTTP_STREAM_JOB_CONTROLLER)
t=91866 [st=3424]        HTTP_STREAM_REQUEST_BOUND_TO_JOB
                         --> source_dependency = 532267 (HTTP_STREAM_JOB)
t=91866 [st=3424]     -HTTP_STREAM_REQUEST
t=91867 [st=3425]      URL_REQUEST_DELEGATE  [dt=0]
t=91867 [st=3425]     +HTTP_STREAM_REQUEST  [dt=293]
t=91867 [st=3425]        HTTP_STREAM_JOB_CONTROLLER_BOUND
                         --> source_dependency = 532317 (HTTP_STREAM_JOB_CONTROLLER)
t=92160 [st=3718]        HTTP_STREAM_REQUEST_BOUND_TO_JOB
                         --> source_dependency = 532318 (HTTP_STREAM_JOB)
t=92160 [st=3718]     -HTTP_STREAM_REQUEST
t=92160 [st=3718]     +HTTP_TRANSACTION_SEND_REQUEST  [dt=0]
t=92160 [st=3718]        HTTP_TRANSACTION_SEND_REQUEST_HEADERS