Wow that's really cool! Part of my PhD thesis was about writing stable treemapping algorithms for temporal data. The idea being that you want your treemap cells not to fly around like what I'm seeing in your demo, but to remain more or less in the same position without sacrificing too much on the cells aspect ratios. We've come up with a pretty effective and fast method to do that, check out the paper and a demo down below. Maybe we could even do a collaboration to get this implemented in perspective.

https://github.com/EduardoVernier/eduardovernier.github.io/b...

https://youtu.be/Bf-MRxhNMdI?list=PLy5Y4CMtJ7mKaUBrSZ3YgwrFY... (see the GIT method)