Before my test even began the Proctor said that my 2018 mac air was too slow (I did all the diagnostics before - they said it was fine). I have to re write :(
I was just using 7Sage just fine. Could be a browser issue. Relaunch browser or clear your history/cookies. Otherwise it could be a graphics driver issue that you need to update.
How much RAM do you have in your computer (not storage)? It may be that because they're monitoring all the processes on your computer it's making it chug.