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The advantage of using a cube in Power BI is that it allows for faster data analysis and reporting by pre-aggregating data in a multi-dimensional format. This reduces the amount of processing required when querying large datasets, resulting in faster response times and improved performance.

To generate a cube in Power BI if your data is kept in GCP, you can follow these steps:

1. Begin by connecting to your data source in GCP using Power BI.
2. Open the Query Editor and transform your data as necessary to prepare it for use in a cube.
3. Select the modeling tab in the Power BI Desktop and click on the "New Measure" option.
4. Define your measures by selecting the fields you wish to aggregate data from and specifying the aggregation type.
5. Create your cubes by opening the “Modeling” tab and selecting the “New Measure Group” option.
6. Add your measures to the measure group to create your cube.
7. Once your cube is defined, you can use it to create reports and dashboards in Power BI.

Note that creating a cube in Power BI requires an understanding of multi-dimensional data modeling concepts, and may require some additional training or experience for users who are unfamiliar with this type of modeling.