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Community of the Android app Boost for Lemmy
I think the app is caching things without you having to look at them so they can instantly load. Not 100% though. It’s what I noticed happening years ago.
Servers cache stuff too. Instead of orchestrating each script and each request to db, they prerender pages to deliver. It's getting trickier with dynamic sites like reddit, but it still saves a lot in processing time, money.