[Buge]

The performance on my Android phone (Nexus 6) is not good. I would have thought Rust would be fast. The fps is fairly low, a lot lower than Maps or Chrome, at least when Maps isn't freezing up. And it seems the transitions between levels might be proportional to fps, because they are irritatingly long.

[MaulingMonkey]

I'd guess any performance problems are probably on the GPU / OpenGL side of things, which Rust won't help with (nor hurt). The Nexus 6 has a 1440p screen powered by a mobile GPU maybe a little weaker than previous generation consoles (~172 gflops max for the Adreno 420, vs e.g. ~220 for the PS3 [1]) that were often handling 720p titles (a quarter of the pixels). Very easy to exceed your frame budget.

[1] http://gpuflops.blogspot.com/