I have a similar experience on my MacBook Air. I've tried giving it more memory, more CPU, but neither has helped. Once the guest starts it seems ok for a while but it seems to get slower and slower until it's unusable. I'm primarily using it for Visio and have tried windows, full screen on one monitor and full screen across both. I also turned off sharing and it made no difference. I did not have this issue with Fusion 7/Win 10.
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