Minecraft drops from 1000fps to 10 fps?

Ro
4

Minecraft drops from 1000fps to 10 fps then again to 400 then again below 100fps that is not normal temperature everything is ok utilization also ok my PC:

RTX 2070 Super 8GB

16 GB RAM

CPU Intel Core I7 9700f 3 - 4.6 GHz

Does anyone have an idea?

Ps. The same with Optifine and with other Minecraft versions as well

un

Maybe limit the FPS to 60 or 144.

Ro

Tried already did not help: /

un

Maybe turn off MipMapping.

Ro

I tried to drop it down to 30 fps anyway… On the left it always says I should have 1000 fps and next to it it drops down from the thousand to below 100fps