Since the players on my server love purges, I once tried an experiment where I decreased the “Purge Meter Update Interval” from the default of 15 minutes to 7 minutes.
The strange thing was that it didn’t seem to have much of an impact on things. This made me suspect that the update interval affects both increases and decreases to the purge meter.
What I’ve done since is restore the interval back to 15 minutes but decrease the “Purge Meter Trigger Value” from the default of 42,200 down to 25,000. This had had the desired effect of allowing people’s purge meters to increase more easily.
Another thing that you can do (if you are the server admin) is to manually trigger purges: