There are a whole bunch of questions about very slow performance of VNC when using it to login to a Mac. Among them:
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I had the problem also. I've gotten around it, as described below.
First, my situation:
- Near computer (the one I'm sitting at): iMac 20'. Native screen res: 1680 x 1050. (2007 vintage) Running 10.11.1 El Capitan
- Far computer (the one I'm trying to see by VNC): Mac Pro with 24-inch Cinema display. Native screen res: 1920 x 1200 (early 2009) Running 10.11.1 El Capitan
- Connection: VPN from home to work over Junos Pulse Secure. Ping shows an average round-trip time of 24 ms.
- Using: Native VNC built into OS X: Finder: Go: Connect to Server... vnc://[remoteMacAddress]. Running in 'Full Screen' mode with 'Adaptive Quality'.
With the native setup, I figure I was getting about 1 sec from clicking on something to seeing the change on my screen.
My workaround:
- On the far computer, open System Preferences / Displays. Change Resolution from 'Default for display' to 'Scaled'. In the list below, select: 1600 x 1000. This change alone got me most of the improvement I see.
- In the 'Screen Sharing' menu on the near computer, under 'View, uncheck 'Turn Scaling On'. This may have gotten me a bit more performance, but it's hard to tell.
Note: I think the key is, in step 1, to select a resolution that is Smaller than the native resolution of the near computer's display. Turning Scaling off just simplifies the situation a bit more.
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Hope this helps.
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Mac Pro, OS X El Capitan (10.11.1), Cinema display 1920 x 1200
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