NieR: Automata has the same effect for me. That game made me have some thoughts, I tell you what, that once-in-a-lifetime experience you wish you could erase your memory of to experience it for the first time again.
Seconded, though particularly the Royal version. The extra semester (and related content) and quality of life upgrades are completely worth it, and the best way to experience the game.
Try turning off “Dynamic Crowds” in settings. I didn’t notice much difference in how the crowds behaved, but it supposedly simplifies their AI and pathfinding to cut down on CPU use. It helped me a lot in the city.
You can actually have the game ask for opportunity attacks. If you open your character tab (or party view), up at the top, there’s a tab for “Reactions”. You can set it to automatically take opportunity attacks or ask before.