Yeah i have the same problem
I have a project made in UE 4.27 and when Ue5 was realease, i try it to upgrade the project, but fps decrease allot.
I thought was about the project, but i started to make some tests.
I created a new thirperson project template in 4, i upgraded to 5 and Fps decrease again.
I have a RTX 3070
Ram: 16 Gb
I will put here 2 screenshots. 1 in UE 4.27 and another 5
