Enhancement: Compression type and level support

[Forza-tng]

Hi!

Would it make any sense to support different compression levels for zlib? Default is 6, but perhaps 1 would be faster?

Also, I think zstd (levels 1-5) or lz4 would be a better choice of compression. Much much faster than zlib.

[soulseekah]

It definitely would. We'd need some benchmarks though, if the gains are tiny - no point probably. But a patch is very welcome either way :)