How was the Wraith Superhive so much more powerful and efficient than Atlantis (which was powered by 3 ZPMs?)

I know the Superhive was powered by a ZPM but what was it about their tech made them seem so much more superior when powered with one?

And it seems like, with what they were able to do with it, how was their ZPM not depleted so quickly? It seems like other ZPMs get depleted relatively quickly.

Anyway, with that said, what's now preventing other Wraith ships from doing the same thing? How would Earth stop them?

Sorry if these are dumb questions. Haven't seen the series in awhile and just started rewatching but am kind of skipping around.

submitted by Cmdr_Nemo to Stargate
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