There should be an option to control the quality settings of the Episode Previewer on the writers portal (LOW QUALITY/MEDIUM QUALITY/HIGH QUALITY), just like they have in video games.
I’m currently using a Macbook Pro 2017. When the Episode previewer is enabled, my laptop fan runs really fast and my browser begins to lag, even if I don’t have any other programs open except for my browser (chrome/disabled extentions).
Perhaps being able to decrease the quality of the previewer would reduce CPU usage and will eliminate the lag.
I believe this feature would be beneficial also to people who are using older computing models.