Hi Nate,
with V2.0, Starling was modified quite deeply especially for management of mesh batches and vextex data. The new version seems very promising performance-wise.
Daniel wrote a migration guide to facilitate the transition (http://wiki.starling-framework.org/manual/starling_2_migration_guide).
The current spine runtime does not compile mainly due to RenderSupport renaming into Painter as well VextexData redesign.