[TeMPOraL]

> With internet speeds only getting faster

They're not getting faster uniformly. Even on my phone, one minute I have high-speed LTE, the next minute I'm on EDGE. Happens a lot during inter-city travel. Not many things piss me off like "simple" sites that fail to load on weak connections, because they're too bloated.

> I can't help but think it may be wasted effort.

Multiplied times the number of users, efficiency improvements in popular software translates to saving quite a lot of electricity. Something worth consideration, IMO.