How to increase the size of the cache to max disk space?

I use raw therapy every day on a lot of photos and I don’t mind if the cache size gets bigger. I just need the best performance as possible.

That’s great. What kind of system?

A very large cache can also decrease performance: https://github.com/Beep6581/RawTherapee/issues/5083

If you (think you) need more than 100 000, edit the MaxCacheEntries key in the options file. It might get overwritten if you edit Preferences, so you might also need to edit the maxCacheEntriesSB SpinButton parameter and recompile.

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