What can provide the greatest reduction in rendering duration for a slow visual in a Power BI report?

Reducing the number of visuals in a Power BI report can significantly decrease rendering duration, particularly when dealing with complex reports that have multiple visuals pulling from extensive datasets. Each visual incurs its own processing overhead and demands resources for rendering. By minimizing the number of visuals, you effectively reduce the total workload associated with rendering the report, which can lead to faster performance, especially if the visuals that are retained are optimized and designed to convey the most necessary information.

This approach not only lightens the processing load on the underlying data model but also helps streamline the rendering process in the user interface, providing a more efficient and responsive experience for users. It's a fundamental technique in report design that leverages simplicity and clarity, ensuring that the most critical insights are communicated without overwhelming the system.

While other options, such as optimizing the DAX query or changing visual types, can also improve performance, the reduction of visuals offers a more holistic solution by addressing the overall complexity and resource demands of the report.