What are common causes of slow Power BI reports?

< 1 min read

Common causes of slow Power BI reports include large data model size.
In one project, unused columns and historical data increased file size and slowed performance.
Complex DAX measures with nested calculations caused slow visual rendering.
High-cardinality columns like transaction IDs increased memory usage.
Too many visuals on a single page triggered multiple queries simultaneously.
Improper relationships or many-to-many joins affected query performance.
Lack of indexing or unoptimized SQL in DirectQuery mode caused delays.
After optimizing model design and simplifying measures, report speed improved significantly.

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