So I've been profiling my client and server and have noticed that File IO (namely java.io.File.exists() as well as some reading/writing) uses a fair bit of tick-time (up to 15ms during high load).

As far as I'm aware, FoamFix doesn't do any sort of tweaks in that area, now it could be for good reason, like there's no need to and it's already as good as it can be, but I thought I might throw this suggestion out there in case you can find anything interesting.

Thank you for your work on FoamFix <3

RegionFileCache needs to be gutted IMO. :)

Maybe for 1.13, as I feel it will bring changes in related code areas.