If you’ve got a couple hours free, and are interested in the performance of the two primary business rules offerings from Microsoft, check out the latest post by Charles Young.
Charles does some comically thorough analysis and comparison of the Windows Workflow rules engine and the Microsoft Business Rules Engine that ships with BizTalk Server. He looks at performance with relation to rule set size, startup time, fact size, caching and so forth. His conclusion is that the Microsoft Business Rules Engine generally performs better than the WF Rules Engine. However, there are lots of considerations that go into that conclusion, so I heartily encourage you to read and digest Charles’ post.
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