I was going to say, how about an option, but technically, simply allowing the zoom function to go further is basically an "option" already.
So for those having a performance hit at a certain "zoom" level, they could simply zoom in a bit I would assume, yet it would still allow those of us with a high performance machine the freedom to work with less limitations.
Maybe an indicator (2x, 5x, 20x, etc.) for zoom level in the IDE so anyone can gauge to what extent they can zoom out to before their performance drops for their future reference and editing pleasure?