I can say with confidence that the patches had nothing to do with any performance degradation you’ve experienced.
The game has had very little done on the backend for a long time now, and what has been done would have no effect on framerate. I certainly can’t add secret -fps modifiers to gear! So if the game has not changed, then the conclusion must be that something else has.
If the game is running poorly on the lowest settings on an otherwise decent system, laptop aside since those are inherently weaker than their PC counterparts, then that is the time to investigate external factors such as drivers.
This is not how engines work. Unreal Engine is 23 years old.
What AAA game you are comparing to is going to give you vastly different results. GD, and ARPGs in general, are very heavy on the CPU with tons of entities on the screen at once all moving around, calculating actions and creating FX and lighting.
Something like Witcher 3 has maybe 5 enemies on screen at once? One spell at a time? Many regard it as a gorgeous game, but its system load is entirely different.