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SharePoint Incremental Crawl takes much longer after adding or removing a user

It’s a sad and known fact that having lot’s of ACL’s in your SharePoint database has a negative effect on the performance of your site. What I didn’t know yet was that changes to the ACL will impact you incremental crawls. Vikram Lakhotia has posted a description about this in his blog post: “SharePoint Incremental Crawl taking a long time after adding or removing a user”.