FWIW, and this is not make a point either way, Google Mail downloads about 14 MB, two thirds of which is JS. Most of that can be cached, though. It also uses 12

FWIW, and this is not make a point either way, Google Mail downloads about 14 MB, two thirds of which is JS. Most of that can be cached, though. It also uses 120 MB RAM after initial load, more as I click around. Figures as reported by the Firefox dev tools.