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An unexpected perf feature
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Posted Nov 19, 2009 12:41 UTC (Thu) by jzbiciak (✭ supporter ✭, #5246)
...which points out the other reason why this won't be as much of a problem as a couple posts up suggested: Ads quite often come from an entirely different server. For SPDY to prioritize or push ads ahead of other content, the ads and the content need to come from the same server, which would require some rearchitecting of the web.
Now, that said, if Google moves another step further, providing SPDY support to browsers through a SPDY-to-normal-HTTP caching proxy (as I suggested it might in this comment), then the ad-push concern returns.
Posted Nov 19, 2009 18:12 UTC (Thu) by Simetrical (guest, #53439)
Recent browsers are getting better at doing whatever they can in advance of
the actual script load -- fetching resources that they expect they'll need,
parsing, and so on. But I don't think any will actually render the rest of
the page before the script is done executing. What would happen if the
script did something like document.write("<!--")? Or if it redirected to
the different page? The user would have been shown something they were
never supposed to see according to the applicable standards.
This is one of the problems <script async> is meant to solve, incidentally,
but it won't really work for most ad scripts -- they tend to use
document.write() to output the ad. In principle you could use DOM methods
to insert the ad after the fact instead, of course. Then again, this would
mean the user could scroll right past the ad location without ever seeing
it . . .
I'm a web developer, though, and not a browser implementer, so take this
explanation with a grain of salt.
Posted Nov 27, 2009 1:03 UTC (Fri) by efexis (guest, #26355)
Posted Nov 20, 2009 10:25 UTC (Fri) by ballombe (subscriber, #9523)
That is why my /etc/hosts carries
etc. with other adservers.
(not that google servers are the slowest to answer...)
Posted Nov 25, 2009 14:31 UTC (Wed) by marcH (subscriber, #57642)
Does that actually make a difference? I assumed adservers hide much better than that from AdBlock and others.
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