How do runners save their worlds so fast. Sometimes I’m on the loading screen for 15 seconds. Do they use a mod or r their PCs just godlike?

the basicaly have a NASA pc lol there are mods to make minecraft go better as well

they either use multi instance or use macros or have a supercomputer

fast reset mod smh

they use a fast reset world mod, the link to the mod is https://www.mediafire.com/file/ywrp6bp0ro7yd7k/fast-reset-1.3.3b.jar/file

You basically just have to move the file to your mod folder. The modfolder-adress should look something like this: C:\Users\Your-name\AppData\Roaming.minecraft\mods

this mod is available for 1.17?

no