Note also that if you have migrated from Windows 2003 or Windows 2008 Server, you may notice a slowdown as the more recent versions of Windows servers are known to have slower disk access (probably due to increased security/scanning measures) that can have a non-negligible impact on disk-intensive processes like Workflow.
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Technical Product Manager
I don't want to achieve immortality through my work; I want to achieve immortality through not dying - Woody Allen