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Hardware:

Late 2016 MacBook Pro w/ TouchBar LG Ultrafine 5K display

Setup:

Screen Sharing app connected to remote instance in the cloud

Problem:

Very slow response to keystrokes. There is no problem in other applications. The problem goes away if I disconnect the external display. The problem does not go away if I switch from WiFi to a hardwired Ethernet connection. I had thought this might be the monitor's shielding problem interfering with WiFi but no, it happens without WiFi. Truly perplexing!

  • Presuming you've tried View > Adaptive Quality in the Screen Sharing app? – py4on Feb 17 '17 at 19:22
  • I hadn't but I see it's checked anyway. Should I try "Full Quality"? – Rob Steele Feb 17 '17 at 19:23
  • Go for it - should increase lag though not reduce it haha. Equally have you tried 3rd-party stuff with much more customisability regarding compression, exact colour etc (I'm thinking of VNCViewer Free which I use all the time for speedy Linux screen sharing). – py4on Feb 17 '17 at 19:25
  • Ha! VNCViewer fixes it! What on earth could make Screen Sharing not play nicely with an external monitor? – Rob Steele Feb 17 '17 at 21:04
  • It's Apple's homespun (read terrible) version of VNC which has multiple seemingly inexplicable issues. I ditched the ScreenSharing app for VNCViewer years ago. Only thing you might miss is forwarding clipboard contents into a session (or retrieving them seamlessly) and of course drag and drop with files. – py4on Feb 17 '17 at 21:05
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Apple's implementation of VNC ScreenSharing often falls short, with significant lag regardless of whether Adaptive Quality is selected or not. A more robust 3rd-party solution like (the free) VNCViewer will provide you with fine-grained compression control, allowing workable VNC sessions over the tightest of bandwidth (e.g. through a shell tunnel to a remote server with really low upload speeds).

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