node --version
v10.5.0
R=10 PORT=3000 node koa2/router.js
ab -c 100 -n 10000 http://localhost:3000/10
Master 3540 is running
This is ApacheBench, Version 2.3 <$Revision: 1826891 $>
Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Licensed to The Apache Software Foundation, http://www.apache.org/

Benchmarking localhost (be patient)


Server Software:        
Server Hostname:        localhost
Server Port:            3000

Document Path:          /10
Document Length:        2 bytes

Concurrency Level:      100
Time taken for tests:   27.092 seconds
Complete requests:      10000
Failed requests:        0
Total transferred:      1370000 bytes
HTML transferred:       20000 bytes
Requests per second:    369.11 [#/sec] (mean)
Time per request:       270.921 [ms] (mean)
Time per request:       2.709 [ms] (mean, across all concurrent requests)
Transfer rate:          49.38 [Kbytes/sec] received

Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:        0  243 1950.7     10   19186
Processing:    10   23  10.2     22     124
Waiting:       10   21   8.1     21      98
Total:         10  266 1950.2     33   19214

Percentage of the requests served within a certain time (ms)
  50%     33
  66%     35
  75%     37
  80%     38
  90%     43
  95%     54
  98%    125
  99%  19172
 100%  19214 (longest request)