[platform-ui-dev] Perspective switching optimizations

[Stefan Xenos <sxenos@xxxxxxxxx>]

I just checked in some perspective switching optimizations that didn't
make it in for 3.1. This should make perspective switching about twice
as fast as it was in 3.1 (between 40% and 70% faster depending on the
perspectives).

Please be on the lookout for funky layout bugs in the next few nightly builds.

  - Stefan