How to disable Zlib compression on a PGS subtitles

Zlib reduces the file size of a subtitle, but using it consumes more resources and causes problems on older hardware, so we will disable it in this quick guide.

Tool that you need:
MKVtoolNix : https://mkvtoolnix.download/downloads.html

Go to Preferences or Press Ctrl + P

Default values and check "Disable additional lossless compression for all track types" and it should turn off automatic compression.

Restart MKVToolNix and check if it's turned off automatically:

Thanks Simulping for helping me on this!
Discord: Simulping#4720