A Power BI page becomes slow when a slicer changes. How would you find the cause?

Instruction: Add real before-and-after timings only if you measured them. Name the tools you used; avoid claiming source execution-plan analysis if someone else performed it.

Context: Measures a reproducible user interaction, distinguishes query and rendering work, and verifies improvements without guessing at the bottleneck.

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I'd reproduce the slow interaction with the same filters and record it in Performance Analyzer, which is available in Desktop and when editing a report in the service...

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