Hi Trent,
Indeed, perfomance will benefit from splitting the View. In my experience, users don't like Tab-like setup in InfoPath until they realize:
1. How much scrolling they really have to do (especially if you have optional sections, repeating sections, etc.)
2. How slow the form can get.
So, you are shy of 1500 controls on your main View. In that case, ActiveX controls wouldn't be an option for you (too many on 1 form).
I would still go with my original suggestion as it is conditional formatting, not rules. Therefore, there is not such a big performance hit. It is long an time-consuming to implement, but it will work with no bad surprises around the corner.
Regards,
Franck Dauché