Skip to main content
Showing results for 
Search instead for 
Did you mean: 

Find everything you need to get certified on Fabric—skills challenges, live sessions, exam prep, role guidance, and more. Get started

Not applicable

using dataflow does not reduce refresh time


i have pbi file that pulls data from sql table with 40 million i created dataflow with same transformations and created a new pbi file with dataset connected to my dataflow. SO when i refresh the report, it showing me the size of that table as around 9GB ( as you can see the picture below where it shows 9.09GB for the 3rd table). But the pbi file size remains same. Why is it showing 9gb?

Another question, since the dataset is now connected to a dataflow which is already refreshed, now the refresh time has to be reduced but it is taking same time.  Without dataflow it took me about 25 min to refresh., and after i conncted to dataflow, it is taking almost same time. It supposed to be very quick from wat i heard?

can anyone explain why ?





Community Support
Community Support

hi, @Anonymous 

That should be the size of the query data.

and for refresh from dataflow, you may refer to this blog:


Best Regards,


Community Support Team _ Lin
If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.

Helpful resources

Europe Fabric Conference

Europe’s largest Microsoft Fabric Community Conference

Join the community in Stockholm for expert Microsoft Fabric learning including a very exciting keynote from Arun Ulag, Corporate Vice President, Azure Data.

July 2024 Power BI Update

Power BI Monthly Update - July 2024

Check out the July 2024 Power BI update to learn about new features.

July Newsletter

Fabric Community Update - July 2024

Find out what's new and trending in the Fabric Community.