If you feel the beta is lagging. Must try this

[Mello_o]

If you feel your Galaxy is lagging, you can try turning off the blur effects under Accessibility > Visibility enhancements > Reduce transparency and blur > ON. 

I saw this way in twitter and i did. My S21U is much more smooth! Like amazing. But reduce transparency and bulr, it will cause a little display different. I guess the Beta team is still working on transparency and bulr animations, Hope we can have no lag in beta 3. 

[oMusicPro]

Also, change window, transition animation scale, and animator duration scale to .5x under developer options; super smooth and responsive UI.

[Pumarun951]

Thank you, it helps alot

[Pumarun951]

After this beta my phone started getting hot, once i turned on 'Reduce transparency and blur' my phone stopped getting hot. So thank you for your info.