I load the modpack on cursed voice and i have no issue with fps at all . i dont use opti or fastcraft. Just have to turn vsync off and everything is cool
First time i log in and i spend 30-40min to visit the shop district. It is pretty impressive. You guys should come take a look :) The chunk in the world load pretty fast i didn't got any problem exploring ( angel ring ) It's a lot less laggy than server i played before ( and i played a lot )...