FxOS runs at 50+ FPS for pretty much all of the built-in UI, even on lower end phones like the Geeksphone Keon. Higher end phones are actually really fast, like

FxOS runs at 50+ FPS for pretty much all of the built-in UI, even on lower end phones like the Geeksphone Keon. Higher end phones are actually really fast, like the LG Fireweb (released in Brazil a couple weeks ago) and the GP Peak.