This is my exact problem - basically no CPU usage, which causes very low GPU usage, causing terrible FPS. I'll give this fix a try - hopefully I won't see any flickering. Crucible is nearly unplayable due to frame skips, stuttering, and low FPS.
Edit: looking at your specs in the pastebin, you're running the same CPU and GPU I am.
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Yeah I thought maybe it was just an AMD issue at first but then I seen Intel and Nvidia users with the same issues.