DRL rule file build is taking twice the time in BRMS 6.4 compared to 6.1

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Issue

The DRL rule file build is taking twice the time in 6.4 compared to 6.2. We have more than 150 rule files. It was taking 150 seconds to build with 6.2 and about 300 seconds with 6.4. We tried with both KnowledgeBuilder (legacy 5.x) and KieBuilder (6.x) with the same results. Has anything changed in the build process?

Environment

Red Hat JBoss BxMS Suite 6.x

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