Best Compression Methods for 'Specific' Games. Q&A

[hydefromt70s]

I did some more tests today on "The Medium". My goal was to find the most efficient algorithm for test file which contains Zlib streams. The winner is XT xZlib (old xtool) - managed to inflate file from 968MB to 1250MB and with srep and lzma compression, final size went down to 283MB. That meets my expectation.

Now is the part where I don't understand things. If file contains Zlib streams (I did check in "Drop and Scan for Zlib" app so I'm sure of that) I was betting on XT2020 Zlib/reflate/preflate that one of them will be the most efficient pre-compressor and they didn't work at all! I thought that new version of xtool 2020 will be better than old one? What I don't understand here is why XT xZlib worked and XT2020 Zlib didn't? Are they not the same algorithms to deal with deflated streams?

Would highly appreciate if someone could explain this to me.