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Summary of Patches
A common problem with many performance mods is that the changes they make to the game are unclear. This documentation aims to rectify that by providing an explanation for each mixin option. It is aimed towards mod developers/players familiar with Minecraft internals, although it should still be a useful guide for those trying to understand what the various options in modernfix-mixins.properties do.
Not all options are available for every Minecraft version, as some patches are only needed on certain versions.
I will try my best to keep this up to date, but some new patches may take a while to get added.
1.16 only. Patches JEI to perform its reloading on a background thread, completely eliminating the long delay it adds to world loading.
1.16 only. Backports the Async Locator mod's patches to eliminate server freezes associated with /locate, loot table generation, etc.
All versions. If REI or JEI are installed, construction of the vanilla search trees for creative searching is disabled, and searching is instead done using these mods' search implementations. This saves several seconds during world loading, and probably also saves some RAM as well (although I have not measured).
1.16 only. Removes the hardcoded cap on worker thread count, similarly to what Mojang did in 1.18.
All versions. Avoids creating fresh copies of enum arrays each time a blockstate cache is initialized. Minor optimization, but easy to do.
All versions. Memoizes the RenderMaterial (texture) collection and dependency list that models return instead of requiring them to be recalculated on each request. Helps accelerate the model load/bake process.
All versions. Saves the generated list of stronghold positions with the world, instead of regenerating it on every world load. Saves a little bit of time on 1.16, and quite a bit more on 1.18 and 1.19.
All versions. Many mods ship outdated structure files, which requires the game to upgrade them using DFU every single time they are loaded. This can be quite slow. This patch adds logic to instead save the upgraded version of the structure, and reuse it on the next load. To handle the case that the mod changes a structure file but not the name, the original file's hash is compared against the cached version, and if they do not match the structure will be upgraded again.
The patches in this group fix concurrency-related issues within Minecraft and/or Forge. Most of them result in rare, hard-to-diagnose crashes during loading.
This option is a port of SuperCoder's Chunk Saving Fix mod (because I didn't realize it was already available for Forge at the time).
This option fixes a deadlock that can occur if an exception is thrown while processing entity data. Vanilla does not correctly unlock the data manager when it should. This is tracked as MC-218112 on the bug tracker, and was fixed by Mojang in 1.17.
Experimental, not enabled by default. An attempted fix for the memory leak issue that occurs after playing long enough on 1.16.
1.16 only, fixes a CME that can occur during worldgen when using newer Java versions.
Patches Twilight Forest to perform non-thread-safe client setup using the main thread as it should, rather than the FML worker thread.
Adds ModernFix to the branding list on the title screen, and also to the F3 screen.
Normally off, can be enabled to force the raw stack trace to be dumped to the log when a crash occurs. Occasionally vanilla's crash report system fails to work properly and gives an entirely irrelevant stack trace/report.
Uses a couple injections to measure world load time, datapack reload time, resource reload time, bootstrap time, and adds the necessary hooks to enable vanilla's unused profiler logic for resource reloading if so configured.