If you mix DirectQuery and Import tables on the same visual, Power BI can end up firing repeated queries to the remote source to resolve filters and relationships — and that’s usually the real cause of a sluggish dashboard. Practical fixes that helped me on a Chennai retail project:
- Keep DirectQuery tables out of visuals that combine Import facts; use Dual on small lookup dimensions so filters flow without forcing the fact table remote.
- Build a small Import aggregate table for summary visuals (weekly/monthly) and point slicers to Import lookups.
- Audit relationships: a chain that crosses storage modes often changes where joins/filters are executed.
These simple patterns make visuals predictable and avoid surprise round-trips. If you want to go deeper on storage modes and query plans, consider the Power BI batch in Chennai (the Power BI batch in Chennai).
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