Greetings from the 2020 UQ Work Integrated Learning Symposium, currently on Zoom from Queensland University. This is free and on for four hours, so there may be time for you to join. The students are running the event, which shows commendable dogfooding by UQ.
To improve the performance of Zoom on my slow laptop, and low speed wireless broadband connection, I am trying a router with UDP shaping.
Previously I noticed that with Zoom in full screen mode the sounds would break up and image freeze. If I reduced the window size it worked better, but this was fiddly. Also when a presenter shares their screen, Zoom tends to force the display back to full screen, after which I have to shrink it again.
An approach I tried in the past was to slow my Internet connection, which Zoom responded to by using lower resolution video, making everything more stable. However, this also slowed down all my other network use. There are software utilities which will slow just one application, but I found these did not work with Zoom.
The Internet uses two sorts of data transmission: TCP and UDP. Most applications, such as email and web browsing use TCP, as this provides a reliable connection. Video conferencing programs typically use UDP for the audio and video, as this has less overheads. The utilities I tried to slow an Internet connection only act on TCP, not UDP, so did not slow Zoom.