tsnor :
Use windows resource monitor to see if CPU or Memory are at 100% (they should not be with your config). You should not see paging. Goggle to find how to use "windows resource monitor"
Assume win10 and you are letting windows update keep your system current. If not say what OS.
Look what else is on USB on your system that might be on the same USB hub (e.g. plug in for bluetooth, wireless, etc.) REMOVE them if you don't need them or move them to the other side of the PC (e.g. use a port on the back vs front) or move them to USB3 vs. USB2. Other usb devices on the same USB hub (your PC has several usb hibs internal to it) can cause problems if they share poorly or are on dodgy drivers.
Look for Mouse Software (e.g. Logitech Gaming Software ) and REMOVE it. See if the problem goes away.
Good luck.
Okay so I did check a while ago to see if it was my cpu and it had said 100% the last time I checked it. I checked it just now using resource monitor as well as task manager and my cpu usage is jumping from 60 to 80 to 90 and back. It is mostly at 65% but my mouse isnt lagging that much. I checked task manager when my mouse was lagging and the cpu was at 100%. When I open chrome, my mouse and pc lags a lot and I assume it's because I have 50 tabs opened (5 browsers with at least 10 tabs each). When chrome opens for the first time with all those tabs, my cpu says it is at 100% and that's when everything is lagging, After a few seconds, when everything is settled, CPU usage goes down to 60% and mouse doesn't really lag. If, however, I do open a game, say overwatch or league, the game will experience FPS drops and my mouse will stutter very occasionally and it won't be very smooth.
I am not sure what you mean by all the USB stuff. I have a g502 mouse, hyperx headset and a keyboard connected to my motherboard (which is behind my pc) and a bluetooth dongle connected to the top of my case; I have a nzxt elite. When I went to control manager, I have several devices listed which include my monitor, the bluetooth speakers I have, the keyboard and mouse I use, the bluetooth dongle. I have some devices that are listed which are not plugged in; are you asking me to remove those from the list by clicking "remove device" within control panel?
Lastly, I do have logitech gaming software, but I assume you are wanting me to remove it if any of the other things above don't resolve the problem.