I have video issues with two different computers if I enable Desktope Cube. Using internal video card.
Are you using Wayland or XOrg? You can switch to Xorg to see if that helps or other way round. Logout and at login click on your profile then a cog wheal appears. There set "Zorin Desktop on Xorg" and then login with your password.
Do you have a multiple-monitor setup?
You could also try a lower refresh rate if it is a high one.
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Welcome to the Forum!
What for an internal Graphics do You have? And do You have any thrid-party Gnome Extensions running?
Hi and welcome. You could try @Forpli 's suggestion, but even then you might be struggling as internal cards usually are low-specification, and some even use memory from your RAM.