基于 Koa 开发，这样的 ab 测试结果是什么水平？是不是太慢了？

[tofishes]

本机配置：

MacBook Pro (Retina, 13-inch, Early 2015)
2.7 GHz Intel Core i5
8 GB 1867 MHz DDR3
Intel Iris Graphics 6100 1536 MB

ab 压测基于 Koa.js 渲染的一个页面链接，数据是 require 本地 json，无其他网络连接或数据库连接，单纯的读取 json，然后用 nunjucks 模板渲染。压测结果如下：

ab -n 1000 -c 500 -r http://localhost:8080/comment/list

Concurrency Level:      500
Time taken for tests:   5.958 seconds
Complete requests:      1000
Failed requests:        0
Total transferred:      13953000 bytes
HTML transferred:       13763000 bytes
Requests per second:    167.84 [#/sec] (mean)
Time per request:       2979.105 [ms] (mean)
Time per request:       5.958 [ms] (mean, across all concurrent requests)
Transfer rate:          2286.92 [Kbytes/sec] received

Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:        0   40  43.7      3     118
Processing:   155 1280 523.5   1088    5527
Waiting:       65 1279 523.8   1088    5527
Total:        207 1320 534.8   1097    5528

Percentage of the requests served within a certain time (ms)
  50%   1097
  66%   1610
  75%   1809
  80%   1896
  90%   2079
  95%   2183
  98%   2252
  99%   2288
 100%   5528 (longest request)

后用 pm2 启动多核模式，结果如下：

Concurrency Level:      500
Time taken for tests:   2.474 seconds
Complete requests:      1000
Failed requests:        0
Total transferred:      13953000 bytes
HTML transferred:       13763000 bytes
Requests per second:    404.25 [#/sec] (mean)
Time per request:       1236.862 [ms] (mean)
Time per request:       2.474 [ms] (mean, across all concurrent requests)
Transfer rate:          5508.28 [Kbytes/sec] received

Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:        0   17  17.3      2      43
Processing:    57  920 398.6   1140    1311
Waiting:        3  920 398.7   1139    1311
Total:         66  937 384.4   1143    1312

Percentage of the requests served within a certain time (ms)
  50%   1143
  66%   1185
  75%   1223
  80%   1237
  90%   1278
  95%   1290
  98%   1297
  99%   1302
 100%   1312 (longest request)

看看别人的测试结果，好像这个挺慢的了，为什么呢？