Ever since the software update my device has no animation transitions. For example if I open the multitask windows and I hit clear all it doesn't smoothly disappear it just abruptly goes to the home screen. The same happens with the notifications the animations for the talk to text are choppy and any other apps. It all acts like it's extremely slow or things have just randomly shut down and instantly take you to the homepage, that's how abrupt it is. I don't know if anybody else is having this issue and I did put in a ticket for it. I have the S21 Ultra 512gb version with 16 gigs of RAM and I even did a factory reset to try to make this go away and it has not. My device is also an unlock device on the Verizon network with no Verizon bloatware on it so it's raw Android or at least this UI.
