Concurrent requests:

$ ./wrk -t12 -c400 -d30s http://127.0.0.1:5000/twolfson
Running 30s test @ http://127.0.0.1:5000/twolfson
  12 threads and 400 connections
  Thread Stats   Avg      Stdev     Max   +/- Stdev
    Latency   243.55ms   92.63ms 555.41ms   71.50%
    Req/Sec   154.50     67.45   301.00     72.79%
  53694 requests in 30.01s, 1.67GB read
  Socket errors: connect 0, read 0, write 0, timeout 79
Requests/sec:   1789.27
Transfer/sec:     56.90MB

$  ./wrk -t12 -c400 -d30s http://127.0.0.1:5000/whit537
Running 30s test @ http://127.0.0.1:5000/whit537
  12 threads and 400 connections
  Thread Stats   Avg      Stdev     Max   +/- Stdev
    Latency   231.76ms  128.53ms   1.53s    98.81%
    Req/Sec   159.72     50.42   254.00     80.00%
  55904 requests in 30.00s, 1.74GB read
  Socket errors: connect 0, read 0, write 0, timeout 203
Requests/sec:   1863.23
Transfer/sec:     59.25MB