SQL client runs better on Vista over XP?

My client has a 3rd party app with SQL 2005, (using SQL, not Windows authentication) as the backend and mostly XP Pro workstations, two with Vista Business, all with Gigabit Nic's. Every screen that involves database queries runs faster on the Vista's (or on the SQL server itself), the developer says they know of know reason, and in fact don't really support it on Vista yet. Anyone have any brilliant ideas why this may be the case, or how to track it down? Thanks.

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