We are attempting to upgrade from R3 to R4.1. On our 4.1 servers, WebI reports that have merged dimensions and use those dimensions in drop-down filters (or drill filters) are extremely slow to load. Specifically, the drop-down filters themselves are slow to appear on the report, and the report content loads slowly while waiting on the filters to resolve. Reports that load in the browser in seconds in R3 might take anywhere from 1 minute to 20 minutes in R4. Has anyone else seen (or resolved) this behavior in R4?