I’m way worse framerates, battery life overall performance with GTA 4. I really didn’t expect this as GTA 5 ran an extremely stable 60 FPS and only 10 watt battery drain. Even with the explosive bullets cheat and 5 stars not once did I see a frame drop. With 4 though, I had to drop it to 40 fps and still encounter occasional freezing with medium settings.
You sure you’re playing on SteamOS? I got stable 60 in 4 on mid-high settings, but in 5 it’s more around 50 with drops to 40. GTA4 PC port is notorious big it runs better on Linux because of DXVK (it works on Windows too, but it’s default on Linux with Proton)
Same, the smoothest experience of gta iv i got from steam deck. My main pc is i9 9900k with 2080ti and its not that stable as on steamdeck xD