I've been watching some playthroughs of the first hateful fight and he was at least 1.5 times faster in my playthrough. I'm guessing some of the game logic is tied to framerate and performance mode on the pro is unlocked. That is all to say that if you have a unmodded PS4 pro with clean vents and fans, you should have no issues whatsoever.
Be aware, God of War Ragnarök story spoilers follow. God of War Ragnarök - PS5 vs PS4 vs PS4 Pro - The Complete Cross-Gen Comparison Most interesting is Sophos' discussion on the possibility of

God Of War performance modes on PS5 and PS4. Credit: Sony. On PS4 Pro you can favor performance and get a variable 1080 to 1656p resolution with 30 frames-per-second.

God of War Ragnarok (Black) at Amazon for $61.58 The previous title on PS4 is still one of the best-looking games out there, RedMagic 9 Pro review: Lightning fast and light on your wallet 1080-1656p. Unlocked 30 FPS. Favor Quality. 1440-1656p. 30 FPS Target. PlayStation 4: 1080p. 30 FPS Target. With #GodofWarRagnarok right around the corner, we’re happy to share all of the God Of War Ragnarok PS4 (Pre Owned) PS4. 2249/-2999. PS4 Pro 1 TB (Black) (Pre Owned) It is great for buying ps4 games for cheap and for selling. Customer God of War Ragnarok PS4 Pro Modes. PS4 Pro Favor Performance 1080p-1656p at an unlocked 30 fps. PS4 Pro Favor Resolution 1440p-1656p at a locked 30 fps. Options are of course a bit limited by OOAGsu.
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  • god of war ragnarok ps4 pro review