After noticing a drop in the framerate, I took a look at the stats and saw that Post Processing went from 0,35ms in UE4.27 to 1,69ms in UE5. Everything is the same, but the performance is totally different.
Any idea about what could be the reason behind it?
Not all, but this is the most notable decrease in GPU performance.
Overall, I noticed that my project is about 20FPS slower in UE5 than it is in UE4.27. While it may not seem a lot, those 20FPS could be crucial in many cases.
Lumen is off. As I said at the beginning, I didn’t change a thing after migration. So the only things that could have changed are the ones Unreal auto-changes in UE5.