Significant reductions in "tps" (ticks per second) lag, especially for late-game colonies with many pawns and animals.
Ensure your download comes from an official source like Steam , GOG , or the Ludeon Studios website to avoid malware and support the developers.
Note that save files and mods are typically stored in the %AppData%\LocalLow\Ludeon Studios\RimWorld by Ludeon Studios directory, regardless of where the game folder is located.