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A comment on How tracking pixels work. Parent comment

Re:How tracking pixels work by CoolGuySteve on Thursday December 19, 2019 @08:17AM (#21834588)
Microsoft’s IIS used to skip a lot of protocol if you were using Internet Explorer. It made pages load a lot faster.

Seems like Google is running the same hustle.

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Re:How tracking pixels work by zo1 on Thursday December 19, 2019 @08:31AM (#21834694)
I think so... Could be anything from hidden JS optimizations, SPDY, server-throttling. Last time I looked, my anecdotal and probably biased investigation into it appeared to indicate that the actual requests were slower on Firefox. Nevermind the question of why Gmail needs to make 230+ requests to the server to start up.
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