@JeanQ, interesting. I also just noticed when I unplug all USB devices it seems to get a little bit better.
Update: Even more, it seems to be only my Logitech mouse. Once the mouse is unplugged, the performance gets better immediately.
Update 2: Followed the steps here regarding Mice and Logitech products (uninstalling LCC), but I didn't even have it installed, and there were no kernel extensions to remove. No luck.
Update 3: In the file vm.log I get these error messages, like a lot (many 1000's) ... Don't know if the log is actually related, but given the performance decline has some connection to the external mouse being connected ...
10-14 21:07:24.499 F /USB:90283:76555/ USB mouse enabled (after guest queue overflow)
10-14 21:07:24.499 F /USB:90283:76555/ USB mouse died, switch to PS/2
10-14 21:07:24.500 F /USB:90283:76555/ USB mouse enabled (after guest queue overflow)
10-14 21:07:24.500 F /USB:90283:76555/ USB mouse died, switch to PS/2
10-14 21:07:24.501 F /USB:90283:76555/ USB mouse enabled (after guest queue overflow)
10-14 21:07:24.501 F /USB:90283:76555/ USB mouse died, switch to PS/2
10-14 21:07:24.502 F /USB:90283:76555/ USB mouse enabled (after guest queue overflow)
10-14 21:07:24.502 F /USB:90283:76555/ USB mouse died, switch to PS/2
10-14 21:07:24.503 F /USB:90283:76555/ USB mouse enabled (after guest queue overflow)
Last edited: Oct 14, 2016