Mouse stuttering

It sounds like a mouse polling/report rate issue.

Just as an aside, mouse polling/report rate is separate from DPI!

You can check it using this link:

https://zowie.benq.com/en/support/mouse-rate-checker.html

(This should work with any screen, not just Benq!)

Swipe your cursor around the screen as fast as possible and watch the list of numbers on the right side of the screen. The highest number on the list is your polling/report rate.

If it's 250 or less it's probably not be the issue, if it's over 500-1000 this may be the culprit.

How you would fix this depends on the brand of your mouse. For the most part it would require its software, I don't think there's an easy way to change it in Windows. If it's a Logitech mouse for instance you would need their Logitech Gaming Software (https://support.logitech.com/en_us/software/lgs) jump into settings and look for 'Report Rate.' If it's set to 1000, drop it to 500. If it's at 500, drop it to 250.

500 should be fine for most games but a surprising amount of games recommend 250, some games may be fine with 1000 but some really don't like it.

just ran that zowie thing, and i was getting an averge of 700, so what does that mean? and what can i do to fix it?

That means your mouse polling/report rate is likely 1000, which is what is probably causing your stuttering. Apex Legends seems to prefer a rate of 500 or less, 250 is best for many people.

Mouse polling/report rate is how many times per second a mouse is talking to the program and telling it what it's doing. The mouse is talking too fast and too much and the game can not understand what it is saying.

What is the brand of your mouse? You need the software for your mouse brand, depending on who makes your mouse I might be able to point you in the right direction.

YOU HAD A VERY BAD BOTTLENECK. THAT IS THE REASON FOR YOUR PAST STUTTERING, AND IF YOU SEE THIS IN 2021 AT LEAST YOU KNOW FOR THE FUTURE. YOU CANNOT PAIR SUCH A STRONG CPU WITH SUCH A MODERATE GPU AND EXPECT A GRAPHICALLY INTENSIVE GAME LIKE APEX TO RUN SMOOTHLY! YOUR STUTTERS GOT WORSE AFTER YOU UPGRADED YOUR CPU BECAUSE YOU MADE THE BOTTLENECK WORSE. YOUR CPU GOT STRONGER AND TRIED TO PUSH OUT MORE PERFORMANCE THAN YOUR 1060 IS CAPABLE OF KEEPING UP WITH, THUS CAUSING MASSIVE STUTTERING. SO YES YOU SHOULD'VE TRUSTED YOUR INSTINCTS, IT'S DEFINITELY YOUR HARDWARE.

I have rtx 3090 Ti + Ryzen 9 5900x + 4x 240Hz Monitors, it still causes stutter in some games with polling rate 250 & above. I'm using Logitech G900, maybe the software of the mouse it self OR the game engine's the culprit.