The more extensions I add to a ring group, the slower Zulu will ring. Im using ring all.
If I have under 10 extensions it rings a few seconds later. If I have more, it takes a lot more time. If I have over 15, then It will ring just before the failover.
I can confirm this behaviour, see also Zulu, delayed ringing in larger queues and that’s regardless of using the mobile app or the desktop app.