[rules-users] How to prevent activation list creation on retracts

I think this question was asked recently but I cant seem to find it. Using 4.0.7 I have a large number of facts I need to retract from working memory after all rules have been processed (transaction is completed) so I can insert new facts for the next transaction. Milliseconds count. I know that drools recalc's which rules are eligible to be run after each retraction. Since all facts are being removed its unneeded processing and time that could be saved. How can I tell drools that until I tell it otherwise do not re-evaluate the rules to save time? Scott