SPDY support would be a nice-to-have, but the problem with today's websites is that the vast majority of your resources are external; ad networks, like buttons, and so on. It's is great in the optimal case, but in the typical case it doesn't make a significant enough difference to bother supporting[2].
The other two issues (NavTiming and WebRTC) would be really useful, but for a minimum of web developers or applications, so I can understand them not focussing developer time on it. It'll come soon, but the Safari team was pretty small last time I checked so it's no surprise it's not a priority.
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No[1].
SPDY support would be a nice-to-have, but the problem with today's websites is that the vast majority of your resources are external; ad networks, like buttons, and so on. It's is great in the optimal case, but in the typical case it doesn't make a significant enough difference to bother supporting[2].
The other two issues (NavTiming and WebRTC) would be really useful, but for a minimum of web developers or applications, so I can understand them not focussing developer time on it. It'll come soon, but the Safari team was pretty small last time I checked so it's no surprise it's not a priority.