way to get the old builder instead of sbuild? >2x slowdown

Hi. The sbuild backend is great, something I wanted for a long time. But now that I have it, I also realize it is slow. My general guess after using it on a couple of packages is a 2-4x slowdown. For 99% of my packages, there is no QA difference between the old and new build method that I've realized. So the new build method just means things are slower than before, which really harms iterative development of making fixes, pushing them and fixing errors, pushing etc.

Would it be possible to have an optimized-for-speed build method? Which could be opt-in. Could be the old build style, or something else.