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. 

[Mello_o]

If anyone want to rollback or withdrawal… please try this, your galaxy will smoother than One UI 3.1 again.

[Gendo]

I believe it's off by default. I've never touched this setting and it's off already.

[Mello_o]

Sorry, i mean off is turn it on, reduce the transparency and blur

[Mello_o]

Edit it. Thanks remind

[Gendo]

You know what? You're right. Pulling down the notification shade is MUCH smoother. And the jank One UI is gone. Nova launcher has been smooth since Beta 1 so I haven't left it because One UI was jittery, but I might have to give it a go now. Thanks!

[Mello_o]

Nice! That is helpful for you too. I think the beta2 they add more transparency and bulr animation, but may not optimize good. Turn on the reduce transparency, the Galaxy is perfect smoother

[MochaVex]

Ha! I told Samsung this early on and I'm glad they added this toggle.

[Mello_o]

Ha! Thanks for your contribution!! I hope they can optimize better of transparency and blur in Beta 3. turn on the reduce transparency, some display is wired, like app folder page, and will lost blur effect.

[USBetaModerator]

Hello @Mello_o ,

Thank you for your Tip. We appreciate your contribution to the Beta community.

Regards,
One UI Beta Team