slower with threads on
Running the server with threads appears to introduce significant performance penalties..


With `--threads = on` (8 threads) : 
```bash
Running 10s test @ http://localhost:8000/text
  2 threads and 10 connections
  Thread Stats   Avg      Stdev     Max   +/- Stdev
    Latency   282.46us   71.12us   1.45ms   79.08%
    Req/Sec    17.51k   764.96    18.69k    80.69%
  352091 requests in 10.10s, 46.34MB read
Requests/sec:  34859.58
Transfer/sec:      4.59MB
```
Without threads (1 thread): 
```
Running 10s test @ http://localhost:8000/text
  2 threads and 10 connections
  Thread Stats   Avg      Stdev     Max   +/- Stdev
    Latency   200.23us   40.78us   0.97ms   85.91%
    Req/Sec    24.58k     0.92k   25.83k    82.67%
  494158 requests in 10.10s, 65.03MB read
Requests/sec:  48926.05
Transfer/sec:      6.44MB
```