Stuttering and FPS drops in Windowed FullScreen Mode

Technical Support
Hello, I'm using:
8700k OC'd to 5.1ghz
GTX 1080 - most recent driver (388.13 I think)
1440p GSync Monitor, 144hz

Recently I've noticed that when running in Fullscreen Windowed Mode, I get frequent frame drops from ~140 FPS all the way down to 30 or 40 for a few seconds. If I switch to Fullscreen mode, this doesn't happen.

Could this be a CPU issue, a GPU driver issue, or a Diablo 3 issue? Any ideas? I have two monitors and I like to browse/play music while playing, so it's a pain in the !@# to have to Alt+Tab now.

I did try turning off GSync for Windowed mode, but experienced the same problem. It's very odd. I've upgraded ALL of my hardware within the last year, but with the old hardware (2700k, GTX 680) I never had these stuttering issues.

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