Viewport FPS drops after mousing over World Outliner or Content Browser

If I’m in the main Viewport window, I’ll get almost a solid 120 FPS. If I mouse over the World Outliner or Content Browser sections, my FPS drops to around 30-50. I’ve tried turning off real-time thumbnails, but it doesn’t fix the problem. Is there a workaround to this? Thanks in advance.

Windows 10 Pro (1709)

i7 7700K

16GB DDR4

GTX 1080 Ti (driver 391.24)

2560x1440 165hz monitor with Gsync

Hello,

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Thanks