The version of FXOS that's presently shipping has a lot of rough edges. The B2G 26 branch includes all of the changes made between Firefox 18 and Firefox 26, ma

The version of FXOS that's presently shipping has a lot of rough edges. The B2G 26 branch includes all of the changes made between Firefox 18 and Firefox 26, many of which are performance related. Notably, JS performance is going to shoot up (new Spidermonkey goodness), SVG performance is going to get a boost (better hardware acceleration, better caching), and lots of general optimizations are going to land. I'd like to think of the current FXOS builds as the Android 1.6 of the product, and the forthcoming versions as the Android 2.2/2.3s of the product.