[Zope] "Pausing" ZCatalog and re-indexing later

Hi :-) The system I am working on is using a ZCatalog with some indexes (over 10) for faster searching. Unfortunatelly there are some use cases, where I have to add really many new objects to ZODB. It works, but very slowly. I suspect that this is because when I add an object to Folder (with _setObject) it gets indexed - couple thousands of objects multiplied by over 10 indexes = looooong. Am I guessing right or am I completely lost? ;-) If this is the probable reason - is there some way I could disable indexing temporarily and after adding all of the objects make it re-index the new ones? I think that even a full re-index would work faster than it works now... I would be very grateful for any suggestions. Best regards, Maciek