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

[L33THAK0R]

Source: Clean GOG Files

Original Size: 41.5 GiB
Final Size: 10.032 GiB (Incl. installer)
Ripped Files: French/German loc.
Internal Tools used:

Xtool v0.8.9 (Codecs: reflate, zlib)
Srep
Lolz
Bpk

External Tools used:
SFK
MParallel
HDiffPatch
OGGRE (Wwise)

Additional notes:

PCK archives can be processed for an approx ~100 MiB gain, however a good portion of the WEMs aren't worth processing, I made a basic python script to diff them, I'm sure anyone wanting to see similar gains is able to figure out their own solution.

Old archived, PCK/BNK BMS scripts won't work with these archives, I uploaded ones that do work, these also make ripping the localised content very easy.

There were a few kb worth of zlib/reflate streams, I was processing this title and the sequel, "A Plague Tale: Requiem" (which does have significant zlib/deflate streams present) in parallel and didn't realise I used the same config for this title, you can probably save a megabyte or two in the installer size if your forgo xtool. These results were obtained using xtool's "erase" functionality, so Razor12911's hard work can still be credited with it's success!