It’s always felt just a tiny bit better for me, but also never benchmarked it. Maybe on particularly heavy workloads or less powerful devices like the Steam Deck. Could also be that Gamescope doesn’t cope too well with it.

I do have 2 GPUs, one for my displays and desktop another dedicated to compute/VMs/gaming. So I wouldn’t know if it causes the compositor to slow down or starve for GPU access, as the game has a whole GPU just for itself.