The GSE queue is in reality a separate database managed by the csadmind process Calendar Server scans the queue for updates that need to be made to the components database.
You can tune Calendar Server by adjusting the frequency of this scan. This is accomplished by changing the timeout value of gse.belowthresholdtimeout in the ics.conf file. See Chapter 21, Tuning Calendar Server Performance.
The GSE queue entries can be managed (listed and deleted) using csschedule. You must run csschedule on the local machine where Calendar Server is installed.