One of the major .net 4 update is Workflow enhancement. You can find lot of changes in workflow 4 compared to previous version. MS has invested huge on new workflow 4 version. Now it is ready to use in cutting edge development.
Microsoft published the Performance benchmark compared with workflow 4 and workflow 3 here. You can see huge performance boost in workflow 4 as per comparison. Looks like workflow is ready for cutting edge software developments.
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