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But is it really "realtime"? I thought something should have consistent millisecond or even microsecond latencies to be called realtime, but it's probably not possible for JavaScript application.

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Yes and no. Read "realtime" not like "realtime computing" but like a marketing keyword introduced by firebase which means something like live-replication. https://firebase.google.com/docs/database?hl=en

If you wanted to be pedantic, nothing is real-time not even what you see with your eyes due to photon latency. The word is clearly being used colloquially

It is used clearly in a misleading way since this database is nowhere about latencies and time at all.

I know few people that use "realtime" to mean it in the "realtime OS" sense. It's usually used in layman's terms to mean "happening live".

RxDB isn't being misleading, it's another valid usage of the term.

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