"dh gen/inport 334 176 chunks left"

Hello, so I have a problem that when i open the world, I see "dh gen/inport 334 176 chunks left" and i have a timer that says 9h till compleated,
also my cpu usage is 100% all the time, in launcher i give 8gb of ram bc i have 32, in the mclo.gs it says that i should download satin but im playing at 1.21.4 and there is no satin version for 1.21.4 . sorry for bad english