rm-hull / postcode-polygons / 15913575582

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github

Use memoizer with TTL to hugely speed up response latency (#9)

At the expense of increased memory usage, 100x increase in performance
(real world performance will be different..)

### Before

```console
$ wrk -d 30s 'http://localhost:8080/v1/postcode/polygons?bbox=431667,455097,432504,455847'
Running 30s test @ http://localhost:8080/v1/postcode/polygons?bbox=431667,455097,432504,455847
  2 threads and 10 connections
  Thread Stats   Avg      Stdev     Max   +/- Stdev
    Latency    94.44ms   11.87ms 155.32ms   73.29%
    Req/Sec    53.02      8.69    80.00     82.32%
  3182 requests in 30.08s, 273.35MB read
Requests/sec:    105.77
Transfer/sec:      9.09MB
```

### After

```console
$ wrk -d 30s 'http://localhost:8080/v1/postcode/polygons?bbox=431667,455097,432504,455847'
Running 30s test @ http://localhost:8080/v1/postcode/polygons?bbox=431667,455097,432504,455847
  2 threads and 10 connections
  Thread Stats   Avg      Stdev     Max   +/- Stdev
    Latency     1.21ms    2.91ms  47.46ms   96.75%
    Req/Sec     6.34k     0.89k    7.44k    82.67%
  378309 requests in 30.00s, 31.74GB read
Requests/sec:  12608.51
Transfer/sec:      1.06GB
```

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