We can look up more detailed data on this zap if you are interested, with timings broken out by different parts of the protocol dance .. Zaps require a surprising amount of "back and forth" so there are plenty of opportunities for slowdowns.... https://github.com/nostr-protocol/nips/blob/master/57.md

Yes, it’s using Alby but It’s not necessarily a slow node issue, the whole process requires sometime from generating an invoice to paying it using NWC. We might need to check, maybe there is a room for improvement.