Compression level change, speeds up compression speeds.

[PedroMPagani]

You are free to benchmark this on your OWN, this benchmark from my part was done on DonutSMP events, that get around 700-800 players in a close 400x400 area where there's a lot of Crystal PVP everywhere, lots of chunk interactions etc, compression is highly necessary on environments like this, and a few servers also use this, it's a quick change and most users shouldn't ever feel any need to have this changed but it's a good software improvement if you confirm this should be applied.

This made a buffer compression of around 40kb to 25kb just with little difference from -1, and with MUCH faster speeds.

[github-actions]

Please do not open pull requests from the master branch, create a new branch instead.