There may be several reasons for this:
- Problems with your connection
- Connection issues on the side of the person who shared the screen
- You need to change the Hardware Acceleration option in your browser
We cannot influence the first two in any way. Just recommend turning off VPN and sit closer to the router (or better use a patch cord). But here's an instruction on how to deal with point 3.
How to Turn Hardware Acceleration On or Off
Fire up Chrome, click the menu icon, and then click on “Settings.” Alternatively, you can type chrome://settings/ into the Omnibox to go directly there.
In the Settings tab, scroll down to the bottom and then click “Advanced.”
Scroll down to the System section and find the “Use hardware acceleration when available” setting. Toggle the switch and then click “Relaunch” to apply the changes.
Warning: Make sure you save anything you’re working on. Chrome reopens the tabs that were opened before the relaunch but doesn’t save any of the data contained in them.
If you’d rather wait to restart Chrome and finish up anything you’re working on, just close the tab. Chrome will apply the change the next time you close and reopen it.