Comment by leggenda47

My WindowServer usage was over 90% before but it went back down to under 10% after I did what he said. I also only needed it to test one site I was developing. I had the exact same things he did: MBP slow even when nothing is running, WindowServer always running high. So I think I can vouch for it being true. It seems to have worked for me also.

EDIT: Maybe it's just placebo. I checked the CPU usage on WindowServer before and after deleting & restarting.