One possible feature for C10 is enabling a "Hybrid AOT" to improve launch performance.
You can read about it here: https://medium.com/@donblas/ahead-of-time-compilation-with-xamarin-mac-ceb6fb1d0a3c#.q5vopwz4l
And test it out by downloading this build from master:
And adding this additional mmp arguments to your project:
Please post feedback and bug reports in this thread.