Bottom line: Assuming the game works in Proton with minimal performance overhead, we should be able to get close to 60 FPS at original (PS4) quality settings at 720p. EDIT: Enough people have posted reasonable concerns that I can admit maybe 720p60 is being too optimistic.
No, it's locked at 30 fps in every PS4 model (even the Pro). The game runs natively at 1080p in PS4 and PS4 Slim and 4K at the Pro, I believe. I'm pretty sure its only upscaled 4k on the PS4 Pro. However, I've read something that you can change settings to get 60 FPS, but that may be a PS4 Pro thing only.
Launch God of War and see if the in-game FPS increases. If not, move on to the next fix, below. Disable overlays. Overlays may interfere with God of War, and sometimes they may even introduce performance issues and compatibility issues. Try disabling the in-game overlay before playing the game. There’re many apps that provide overlay features.
Unfortunately, God of War could probably run 4K 60fps in but that might require code to changed, so it will only affect performance mode (1080p) for now. It can run at 60fps on PS4 pro, so
God of War is basically a DX11 PS4 Pro version with unlocked framerates for the PS5, but it looks better than many of the early next generation console games. The biggest visual improvements for the PC version include shadowing, better lightning and colors, enhanced screen space reflections, and ambient occlusion.