well that is the thing, I didn't make those libraries, if they are slow, they are slow nothing I can do unless if you contact the creator here:
https://encode.ru/threads/1399-refla...e-recompressor
as for doom, well I had plans for that game, there will be a plugin that will come with xtool called idtech6.dll or something similar. The plugin is specially designed to work best for games that use that engine (also dishonored 2, doto), handling zlib specifically for them unlike the universal zlib that tries all possible methods to give you the best output, the plugin will know beforehand what to do and how to handle the streams from those games and speed up the process.
xtool.exe e:precomp:t100p:idtech6 - -
is how you will use it, there are several games that if they require a special touch, they will just come separate from xtool in plugin form like dunia, unity and etc, which is why I created a separate thread
here because I reckon there is going to be many.