macOS Screen Sharing Affected by Number of Displays?

[Weston]

Hi all, 

Please excuse me as this isn't directly an isadora issue per se but I am not sure where to turn and am hoping the community has seen this before... 

I am using a mac to run 3 projectors and a second mac to screenshare the first to actually perform my work. The first computer has to be in a location where I cannot see the surfaces (I'll refer to that computer as the booth mac). All computers and projectors are connected by wired LAN via switch so I can control basic projector functions. The signal is running through an HDMI Fibre 100' run and is set to 1080p displays. This is all working fine. It's just the screenshare that can't keep up!

I have experience doing this exact set up and it working fine with 1-2 displays but to my surprise when I went to screenshare with the third projector connected I couldn't get it to work. The screenshare itself can connect to and see the monitor of the booth mac but I am unable to actually control the mouse or click anything. Often when I click on something, the mouse vanishes entirely. Remove the 1-2 projectors.. voila it works again. 

At first, the booth mac I used was a 2013 Mac Pro garbage can. When that didn't work I tried using a 2017 macbook pro instead. Same problem. The screenshare machine is an macbook pro m1 pro 2021. 

Has anyone else run into this before? Is there a limitation I don't know about that I'm butting up against? 

TIA. 

[mark]

@weston said:

Has anyone else run into this before? Is there a limitation I don't know about that I'm butting up against? 

I am sorry to say I've never tried screen sharing with more than two total displays, so I can't enter in on this. Anyone else?

Also, I took the liberty to edit the subject line of your post so people will know you're talking about macOS.

Best Wishes,
Mark

[jhoepffner]

@weston

Hello, which screensharing application do you use? MacOs native?

Have you tried with plain VNC application, like VNC viewer (free)? or teamViewer (non-commercial version)?

Perhaps you can obtain different results.

Personaly I use VNC viewer with a "booth" windows 10 desktop with 4 screens (from nVidia 3090) and command it from an old macBook Pro 13" (Mojave) with VNC viewer and there is no problems to see the four screens and use mouse and keyboard.