why it's so slow on my container?

[gengmzh]

Could you give me some hints？ my container: cpu cores 4, memory 4 gb

wrk -t12 -c400 -d 30s http://localhost:8000/hello.txt

Running 30s test @ http://localhost:8000/hello.txt 12 threads and 400 connections Thread Stats Avg Stdev Max +/- Stdev Latency 53.81ms 63.06ms 701.57ms 88.71% Req/Sec 0.90k 301.91 5.94k 80.05% 320851 requests in 30.04s, 45.29MB read Requests/sec: 10682.54 Transfer/sec: 1.51MB