Minecraft 1.17 lag issue

so when i upgraded from 1.16 to 1.17 my minecraft took a lot of time to load like it took 5 mins on the mojang screen and when i entered my survival world it took almost 2 minutes t o enter usually in 1.16 it takes 10 secs to enter in a world but 1.17 was insanely laggy and when my world started it gave me like 10 fps i tried to wait for a while (for chunks to load) but then also it gave me like 20 fps idk what to do i really want to play with my friends help