Completely agreed that a well-optimized native app will outperform a well-written HTML5 app every time. I do think, though, that the difference is getting small

Completely agreed that a well-optimized native app will outperform a well-written HTML5 app every time. I do think, though, that the difference is getting smaller - especially for apps like Facebook, which are almost entirely content-driven. Things like games are obviously a totally different story. Even five or ten years out, it's hard to imagine HTML5 games with WebGL or whatever seriously competing with native apps.