Hi there
Unfortunately you provided too few information to analyze the issue.
Maybe the underlying tables have very skew data and the first select has to read a larger share of the base tables.
Maybe the columns had been unloaded before and the first query had to load them into memory first.
Is the runtime always bad with the one and always good with the other set of parameters?
Have you checked the PlanViz for both versions? How do these differ?
- Lars