Yosemite VNC connections - refresh problem

Apple's implementation of VNC in 10.8 was perfect. Crisp, sharp, no blurriness.

In 10.9 and 10.10, VNC is unpleasant to use. Whenever you move a window, some graphics turn blurry, and take 5 - 10 seconds to properly sharpen. This goes for graphics and fonts. This occurs even on a brand-new Mac Mini running 10.10.4 with 16 GB RAM.

I've enabled "Reduce transparency" in the Accessibility control panel but this does not resolve the issue.

All thoughts welcome.
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d4nnyoAsked:
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David AndersTechnician Commented:
El Capitan is the fix for Yosemite problems, as Snow Leopard was for Leopard, and Mountain Lion was for Lion.
It is too new for much feedback on the internets, generally it is getting a good reception.
It may or may not offer a good solution for your complaint, but networking was one of the main areas targeted for improvement.
Backup before upgrading an OS, SuperDuper or Carbon Copy Cloner are most often recommended. I use SuperDuper.
I have downloaded the El Capitan installer, moved it out of the Applications folder so it will not be deleted after use. And will create a bootable USB flash drive installer.
Google "el capitan vnc site:discussions.apple.com"
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