These might help and upgrading your cpu wont do much for Elden Ring, unless you plan on playing other actual demanding games and you have the cash. If you dont care about online this is your only real solution to its stutters.
Safest and easiest way to toggle the anti-cheat. Improves performance for some people. Can automatically toggle mods on and off.
www.nexusmods.com
I've tested this countless of times on my high-end PC and you can look it up on steam forums, EAC causes massive stutters on a lot of configurations for this game and it also gives the game some other weird bugs. After you disable it, use Flawless Widescreen and uncap your framerate, if u want.