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

[BKR-TN]

Europa Universalis IV Incl. All DLCs (GOG) v1.34.5.6

Compressed 25,670 files, 7,864,063,100 => 4,243,642,157 bytes. Ratio 53.96%
Compression time: cpu 36.48 sec/real 7572.58 sec = 0%. Speed 1.04 mB/s
All OK

Tested 25,670 files, 4,243,642,157 => 7,864,063,100 bytes. Ratio 53.96%    
Testing time: cpu 13.08 sec/real 102.04 sec = 13%. Speed 77.07 mB/s
All OK

Initial size: 7.32 GB
Final size: 3.95 GB
2 cores, 4 threads

*.mp3, *.ogg and *.zip => xtool:db:dd3
*.wav and *.bmp => msc_tak+xtool:db:dd3
rest of the files => xtool:db:dd3+lolz:dtb1:d128:mtt1:mt4:mc1023

Note: There is not that much of gain with compressing mp3 files by mpz (saving ~100 MB), ogg files by oggre (~90 MB) and preflating zip files by xtool (~110 MB) considering how much slower the installer will be. Also, the "eu4.pdb" file will be ~36 MB after compressing.