Slow Power BI reports frustrate users and reduce confidence in data. Performance issues are usually caused by inefficient data models, excessive DAX calculations or poor data structure design.
Common causes include high-cardinality columns, complex calculated columns, overuse of iterators and missing star schema structure.
Optimising performance begins with reviewing model relationships, reducing unnecessary columns, simplifying DAX and implementing structured aggregation tables.
Performance tuning is not just technical — it improves adoption, speeds up executive reporting and ensures dashboards remain scalable as data volumes grow.
If your organisation experiences report delays or timeouts, a structured performance review can dramatically improve responsiveness.