Resetting might help smooth Windows a bit but like Bignasty said - monitor your hardware.
You already know that your CPU is maxing out at 100% sometimes.
Finding the cause of this will help you balance out your hardware with the demands placed on it.
Finding graphic settings that work with your CPU is tweaking the software to match the hardware's limits.
Looking at CPU performance and what your motherboard is doing e.g. possibly bottle necking your CPU or it is being throttled if it is getting too hot will help you to find the reasons behind your underlying adverse performance that you are experiencing.
After monitoring the CPU frequency and temperature you will find out if your hardware is just reaching its performance limits and make compromises with graphic settings to compensate this like we all do in PC gaming to various extents.
It's just a balancing act until you get acceptable performance by monitoring, tweaking, raging etc!
The factors involved are unique to each person's PC so you have the GPU, CPU, RAM speed, Motherboard quality, power supply amongst other things to consider in terms of the hardware.
Each part of the hardware is generally made by different manufacturers and just connected together internally then Windows attempts to pull it all together cohesively so it's actually surprising that PC s run as well as they do considering the spaghetti that is inside them.
The software side is sometimes easier to sort out but on occasions a change to DX 11 instead of DX 12 can help for example.
You also have Windows itself which can just grind everything to a near halt on occasions.
Hence why so many people post problems and potential solutions on these forums with game related issues including myself.
Sorry if I sound patronising in any way but it's hard to gauge each person's knowledge from their post so considering the lowest common denominators helps you work your way through these frustrations until you switch the PC on without having to contemplate that dreaded 24 FPS game destroying performance.
In an actual war soldiers don't function too well if their eyes only see 24 FPS so I would imagine that they may stop and tweak their brains with an extra fan stuck in their ears to cool their brains on occasions or
Usually around 75c the throttling starts kicking in on many CPU s but it varies according to each model.
My Ryzen 2700X has a threshold of 75c before the fans step up then if the temp continues to rise beyond this it automatically throttles to reduce the temperature it at some point.
Remember though Battlefield V is a real exception to performance as it is astoundingly badly optimised even on Xbox One X.
Andy