Big Sur 11.4 fixed the issue on my MacBook Pro
CE65
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Same issue on my 13 inch 2019 4TB3 MacBook Pro
I5 8579U
16GB RAM
intel 655
it stutters even if I’m not doing nothing and switch desktop or resize a window, the weird thing is that sometimes it doesn’t happens and it is smooth.
I hope in 11.3 otherwise I think I’ll just downgrade to Catalina (although I really like the new UI)