I upgraded to Windows 10 as soon as I could, only to find that my system performance dropped dramatically after I did so, especially when I was gaming on my primary monitor and watching Netflix or a movie or something on my secondary. Well, maybe not "dramatically," but enough to be noticeable: WoW on one screen and Netflix on another never stressed even my seven-year-old processor under Win7, so even a bit of choppiness was a little weird. I figured my system was just getting old at first, before I found the culprit.
Windows 10 has some neat built-in XBOX stuff that acts kind of like the Steam overlay does, letting you stream and take screenshots/record video even when the game doesn't support it natively. I fooled around with the settings a bit when I first upgraded but didn't really pay them too much attention. As it turns out, either I had enabled the Background Recording feature or the XBOX app has it enabled by default, which was constantly writing video to my drive. Despite my game and boot drive both being SSDs, it was enough to degrade performance noticeably when I was doing anything video-related on my second monitor.
The more you know! Background recording's a super neat feature and I'll probably enable it when I build my Skylake box, but disabling it has returned everything to normal. If you're running into any stuttering after upgrading to 10, might want to check the XBOX app and make sure it's turned off.
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