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.
GTA IV was terrible optimized. I tried it on my modern desktop with 3800X and 3070 and was barely getting 60fps without any mods (with mods it was getting way better while having far better visuals). I was able to get GTA IV EFLC to run at constant 50fps with graphics mods on my Steam deck.