Screen sharing in Yosemite - lots of weird graphical artifacts

I have Yosemite installed on both my MBP 2013 Retina and a brand-new Mac Mini (headless). I control the Mini from the MBP with standard built-in screen sharing. It works, but visually it's really bad! Often the remote menu bar goes black, and only repaints (in sections) if I hover the mouse over it. Often the toolbars of various windows take on the color of the desktop and do not display any of their widgets - again until I hover over them. Dragging windows sometimes leaves permanent "trails" and other graphical residue.
The Mini is pretty much running on default settings (although I did set it up by cloning the backup of my previous Mini). In particular, I've not activated any Accessibility options, nor am I using the "dark menu bar" general option.
Is anyone else seeing this? Or can someone suggest some troubleshooting?
MacBook Pro (Retina, 15-inch, Early 2013)
2.4 GHz Intel Core i7
8 GB 1600 MHz DDR3
Intel HD Graphics 4000 1024 MB
10.10 (14A389)
Mac mini (Late 2014)
2.6 GHz Intel Core i5
8 GB 1600 MHz DDR3
Intel Iris (null)
10.10 (14A389)

Yesterday, for the first time since before starting this thread, I restarted the Mac Mini. Suddenly, everything seems fine.
The reason I restarted the Mini was that I noticed (using Activity Monitor) that 6.5GB of my RAM was in use, and SystemUIServer itself was using 2GB. I've haven't been using the Mini for much of anything recently, so this made no sense. Restarting immediately brought back my menu bar (which had been black), and I don't see any artifacts using Screen Sharing.
*shrug* we'll see. If you have this problem and haven't restarted the remote machine, try that.

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    10:05 pm      Friday; November 14, 2014
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    10:02 PM      Saturday; November 22, 2014
    ​  iMac 2.5Ghz i5 2011 (Mavericks 10.9)
     G4/1GhzDual MDD (Leopard 10.5.8)
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