I've got the Ubuntu 20.04.1 LTS version and just updated my drivers. Now, I get low fps and I have no animations on my OS.
I have a suspect of what it can be, and when I first installed Ubuntu, I had to troubleshoot my computer because it showed a message saying: "initramfs unpacking failed: Decoding failed". After seeing this, I had to reinstall Ubuntu without installing the propietary drivers, and re-reinstall it with them.
Now, I have updated my machine and everything seems to be quite worse, I have no animations when I open an application or click on the applications button, and I am getting way less fps on my games. Rocking a GTX 1650, i5-9400F and 16GB RAM @ 2666 MHz.
I dual boot Windows and Ubuntu, and have the latest propietary nvidia drivers installed btw.