my dude you can put all these things on the same machine if you want. The problem is that disks are slow, and the solution is to cache things in memory. That's literally all it is.
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I haven't worked on those feeds, so I can only guess as to why, but I spent like six months working on Etsy's feed a few years ago. # of requests is a poor metric; the metrics that are noticeable to users are things like time to first byte and time to first paint.
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the page for this thread, for example, shows 4 js requests; my fb feed is 431 and counting. fb feed's time to first paint is 1.64s, the time for this page was, err, 1.71s. so even though fb had 100x the number of requests, time to first paint was similar.
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