Improving data model performance
Data model performance can be measured in two ways within Power BI, query performance and processing performance. Query performance is how quickly results are returned by visualizations and reports. Processing performance is a measure of how long it takes to perform a data refresh on the underlying dataset. Data model performance as a whole is very important and the Power BI developer should always be aware of how design decisions may affect performance today or in the future. A deep dive into performance is out of the scope of this book, but an overview is provided here.
Query performance
As you learned in Chapter 2, Connecting to Data, there are multiple ways that you can connect to data in Power BI. For example, you can import data, use DirectQuery, use a live connection, or you can use a combination of import and direct queries with the composite model.
