[ffffruit]

Surely one can a) minify b) remove 'unwanted' services from the file in order to speed things up?

[freyfogle]

Actually with mapstraction v2 you load only the libraries you need by default.

[beaumartinez]

Browsers still have to interpret the JS—I'd wager that in these situation performance (especially on less optimised JS engines) is CPU bound, not IO bound