What do I need to do to turn off Fabric's performance optimizations?You may be better off using Fabric (and server mods from that ecosystem), as it separates performance improvements from its API. The Bukkit Ecosystem wasn't made to separate performance improvements from the API. Hypothetically, it's possible (you can always fork Paper and add in your patches to reverse Bukkit/Spigot/Paper performance patches), but not very practical to do.
Farms are not working on the Fabric server either. I don't understand anything about this. It's best to use Hamachi...fabric doesn't come with performance optimisations, but you can get mods which improve performance which aren't as behaviorally invasive as a full plugin API
I downloaded farm's own world and put it on my server, I also opened it on my computer and it working on my computer, but when I enter my server world, it stops after one or two golems are spawned.well, fabric is vanilla + some bootstrap/API stuff, if your farm isn't working, then it's probably something wrong with the farm/your setup of it
its working but i want to use some mods/plugins.can you try to use the farm on mojangs official server software?