Queue ringall not ringing all simultaneously

On asterisk 1.2 , using ringall is’nt ringing all extensions at the same time. Sometimes there can even be a delay of 2-3 minutes before extensions start ringing. On the backup system, with the (seemingly) exact same settings, the extensions DO ring all at the same time (1-2 seconds delay max).

This leaves callers on hold for some time unnecessarily.

How can I fix it?

turning off recordings seems to have helped, as did adding a second prosesor