After use springcloud alibaba nacos sentinel build environment, sentinel client:

Time QPS refusing to QPS response time (ms)
16:15:16 1.0 0.0 4900.0 versus
16:15:11 1.0 0.0 4900.0 versus
16:15:06 1.0 0.0 4900.0 versus
16:15:01 1.0 0.0 4900.0 versus
16:14:56 1.0 0.0 4900.0 versus
16:14:51 1.0 0.0 4900.0 versus
"Response time (ms)" the average response time is the biggest 4900.0 versus ms no longer increases, in fact, the execution time of about 8000 ms, cause the service not downgrade (downgrade configuration time about 6000 ms)
I want to ask, how to deal with the problem?