I am using Drools 5.4.0, guvnor 5.3.0 and default database. I imported the rules with XML file (550 KB) in Guvnor. After I can check, validate and test (with run analysis button) the rules without problems. Everything works fine. After when I import ed other rules XML file (30,000 KB), I realized that the system becomes too slow and obviously I can no longer veifier, validate or test my rules. I get errors like the following: Please suggest King regards -- View this message in context: http://drools.46999.n3.nabble.com/System-problems-tp4018361.html Sent from the Drools: User forum mailing list archive at Nabble.com.