Read the meshes from .dmesh files (rather than compute them dynamically).This (along with single-mesh mode) hopefully makes the rendering much faster, while keeping the time needed for Object Change low.
The only downside: this increases the size of the release APK from 6 MB to 9.6 MB.
Convert the PostRender to a PreRender, called before we render.This makes more sense as this way things are prepared for the very first render.