Fps down for me to 10fps in 20w22a snapshot when it used to be 90fps

before 20w22a snapshot came out, it was perfect. I would get 60 to 90fps on any world. But when the 20w22a snapshot came out, it went downhill. When I logged into my Minecraft hardcore, I could not play it. The frames were bad. When I was chatting with my friends about this fps bug, they logged into Minecraft and experienced the same thing. So please Mojang can you fix this.