Problem
"When I use ArcGIS in Virtual Computer Labs, the app is slow or crashes."
Solution
Change the display rendering engine to OpenGL.
Go to the Virtual Computer Labs CAD stack and launch ArcGIS Pro.
From the ArcGIS Pro splash page, select Settings > Options > Display.
Tick the OpenGL radio button and click the OK button. If a project is open, it will save and reopen the project with the new settings.