Yea i've commented on this aswell... BM said it wil be optimized prior to the official 1.0 release...
I think angular side should be gzipped/minified and passed through google's closure compiler (doing so will break the build probably, but will enforce strict development which leads to faster code)... put all of the custom angular code in one file, vendor stuff in another. SHould make it faster... and then loading data should be looked at.. not sure what hte bottleneck is.