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Why is my FPS dropping when I move my mouse cursor in games?

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Hi! This is not the only forum I've searched for help, it's like this.

When I came home from school this Wednesday I went to the PC to play some StarCraft 2 and immediately I knew something was wrong because as soon as I moved the mouse cursor the FPS went down to 5-15 (I normally have 60+), first I thought I had too much programs up at the same time but no, it was just StarCraft 2 and internet.
I barely finished the game and was really pissed (I still am) because I have never had this problem before and wondered what was causing it.
Then I started League of legends, Minecraft and Warcraft 3 and the same problem occurred there.

In one night this happened and I really don't know what's causing it.
So if someone know how to solve it please help me. :) 

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This has happened to me before, I tried a few things, but updating the drivers for my graphics card was the final solution. You can also giving high priority to the game in the task manager. Task manager is a good way to check what is using system resources, open it up and see which processes are using the most memory, sometimes a virus guard scan in the background is enough to kill the fps. Are you using a dedicated graphics card? Make sure its enabled and its not the iGPU playing the games. That is all that I could think of right now, good luck! :) 
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try updating the mb chipset drivers and the usb drivers. try the mouse and keyboard is a usb 2.0 port. check to see if there any bios updates for your mb. look at all the devices plugged into the usb port one of them may have gone bad. try running with just mouse and keyboard. try another set to see if the error follows mouse or the pc.

I had the exact same problem as this.

After much time spent trying to figure it out I noticed that with an old mouse the problem didn't happen at all. It was still an optical windows usb mouse, but wasnt a gaming mouse.

After a while i discovered if I open the game then alt tab out, open task manager and close it again, then go back in the game, the FPS only dropped about 20, instead of 55 (with gaming mouse).

Vatsuggggg said:
Hi! This is not the only forum I've searched for help, it's like this.

When I came home from school this Wednesday I went to the PC to play some StarCraft 2 and immediately I knew something was wrong because as soon as I moved the mouse cursor the FPS went down to 5-15 (I normally have 60+), first I thought I had too much programs up at the same time but no, it was just StarCraft 2 and internet.
I barely finished the game and was really pissed (I still am) because I have never had this problem before and wondered what was causing it.
Then I started League of legends, Minecraft and Warcraft 3 and the same problem occurred there.

In one night this happened and I really don't know what's causing it.
So if someone know how to solve it please help me. :) 


I have had this problem the last like 3-4 weeks, and now i got it to work. When i play games, i play them trough steam. So i go to the "Properties" if the .exe file to both Steam and the game that lags, goes to the "Compatibility" tab, and check the "Run this program as administrator" box. And now it work whitout ANY lag spikes when i move my mouse.
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