Your beefy computer should be fine, unless you're trying something particularly ridiculous with it. However, I did just refactor a few aspects that should improve the performance overall. You're welcome to try again now and see.
My 1080TI handles most everything I throw at it (within reason). Keep in mind that even if you did download it and run it locally, it's a browser-based app and thus the limitations of your browser will ultimately still be the limitations you encounter. What browser do you use? Your browser or its default permissions could be impacting your experience.