Yep, there are some undocumented splash parameters. Output of `python -m splash.server --help`:

```
Usage: server.py [options]

Options:
  -h, --help            show this help message and exit
  -f LOGFILE, --logfile=LOGFILE
                        log file
  -m MAXRSS, --maxrss=MAXRSS
                        exit if max RSS reaches this value (in KB) (default:
                        0)
  -p PORT, --port=PORT  port to listen to (default: 8050)
  -s SLOTS, --slots=SLOTS
                        number of render slots (default: 50)
  --cache               enable local cache (active by default)
  --no-cache            disable local cache
  -c CACHE_PATH, --cache-path=CACHE_PATH
                        local cache folder
  --cache-size=CACHE_SIZE
                        maximum cache size in Kb (default: 51200)
  --proxy-profiles-path=PROXY_PROFILES_PATH
                        path to a folder with proxy profiles
```

I think we should create a ticket for them.