I have noticed after the creators fall update many of my games dropped significant amount of FPS, simply opening and closing windows was a struggle (looked like it had like 10 fps), and I blamed it all on their new thingy in the task manager that watches your GPU usage. But nope, that's not the case. I blamed my pc being old but that couldn't be either, all of a sudden my pc became old? So after some research I found a simple option that you can turn off, and behold, your PC fluid as a butter!
However this is also compromising some of the "security" that Microsoft have enabled for you.
Simply go to your windows defender security center -> app & browser control -> scroll all the way down to "exploit protection" and click "exploit protection settings" and the first option there Control Flow Guard(CFG) turn it to "off by default". Restart your PC.