phone is a stuttering mess when unlocked

[Maino84]

Is anyone else else having massive fram rate drops and stuttering after unlocking your phone on the Note 20 Ultra Exynos? To the point where I would leave samsung completely. All the money you spent and the phone is sluggish when unlocked and navigating the UI. 

[GreyMatter]

sounds to me like your cpu and ram are filling up.
clear your caches and restart regularly

[BandOfBrothers]

Are you on Android 10 and Samsung One Ui 2.5 or Beta Android 11 Samsung One Ui 3.0 or the stable global release @Maino84 

As suggested Clear your phone's System Cache Files by turning your phone Off and then from a set series of button presses go into the phone's System Files and clear the cache. No information is lost this way.

To help rule out rogue app(s)  please consider putting the phone in Safe Mode which disables your downloaded app's but let's your stock app's keep working. If the issues stop then this highlights a downloaded app as the possible issue. Come out of Safe Mode and start deleting your most recent downloaded app's one at a time until it stops.  

A very last resort is a factory reset.

A Samsung Experience Store or Samsung Service Centre can take a look. 

[Yokashi]

Yes, it is happening to my Note 20 Ultra as well (Exynos trash).

I don't remember exactly when, but started a few days ago.

Already tried to clear the cache but it didn't work.

This phone now is worse than my old Note 9...

[Maino84]

Just updated to android 11 one ui 3.0. Has fixed all issues. Its much better optimised, animations smoother and feels like a brand new phone again. Definitely see how long this last for but its improved 100% in all areas. If it's available update is well optimised and essential