While loading Minecraft on either the original Minecraft launcher, or the new one as of 11/25/2021, my cpu hits 100% the lags my pc for about 10 seconds. To reproduce this, simply launch the game.
Environment
Windows 10 os, intel core i5 10400f cpu, nvidia GeForce gtx 1660 ti graphics, Java version 1.8.0_311, 8 gb ddr4 ram
Duplicate of MC-202953.