DDOS prevention
Hello,

I have noticed a vulnerability to my server which is running ratchet but I can't work out if it is caused by my NGINX reverse proxy or ratchet/PHP.

When running:
```
websocket-bench -a 2500 -c 200 wss://example.it
```

I completely crash my server. An NGINX process runs at 100% CPU and the server then collapses (could be due to my VPS provider preventing max CPU). 

Do you know of any techniques to debug this issue from ratchet if there is some sort of infinite loop or hanging process?

Here is my ratchet code: https://github.com/maxisme/notifi/blob/master/notifi.it/socket/Notify/Note.php