Multithreading CPU Spikes

I recently bought a new laptop with Intel-275HX and RTX-5090, wishing that would run POE smoothly but that's not the case.

There are regular CPU spikes after every 5-10 seconds and my screen would freeze. I use the in-game debug UI to check and it's indeed the CPU spike and nothing to do with network lag or anything.

After some research into the problem, it seems the multi-threading option in settings is the culprit. With multithreading disabled, I'm having a normal experience, but the FPS drops from 240 to 75-90. Plus, it says 'not recommended' in the game settings.

Is there a more acceptable fix for this problem? (preferrably without messing with CPU idle states and system stuff, as I do use my laptop for some other work)