Katie Cummiskey, et al, do a bit of caching:
Automatic aggregations streamline the process of improving BI query performance by maintaining an in-memory cache of aggregated data. This means that a substantial portion of report queries can be served directly from this in-memory cache instead of relying on the backend data sources. Power BI automatically builds these aggregations using AI based on your query patterns and then intelligently decides which queries can be served from the in-memory cache and which are routed to the data source through DirectQuery, resulting in faster visualizations and reduced load on the backend systems.
Click through to learn more about automatic aggregations, which SKUs of Power BI / Fabric are eligible, and how you can enable it for data coming from Databricks.