Data Overload (Optimize data loading while applying changes/refreshing)

[cfzini]

 Hey!

I'm loading a file into my PBI Report and making some changes over it. Somehow the file "size" is increased 1000x when I update my data. 

Yet I'm doing some Merges with this table, but nothing too complex.

I'm getting a columns with Versions (actually it's only 4 rows) from this table and using them to expand another table.

Does someone knows why this is happening? Is there a way to optimize this? It's taking quite a bit of time to apply any kind of changes in those tables.

[v-huizhn-msft · Accepted solution]

Hi @cfzini,

First, you can filter your resouce data and jut upload necessary data, please refer to this article: Power BI Performance Tips and Techniques.

Second, you use reference query from your screenshot, right? If it is, Please add Table.Buffer in your original Query, when you refresh your reference, which wouldn't access the database again based on my test in this thread. 

In addtion, there are some following useful threads for your reference.

How to Improve Query Reference performance for large tables 
Improving Power Query Calculation Performance With List.Buffer()
Performance Impact with Calculated Columns

Best Regards,
Angelia

[cfzini]

Thank you very much! I've heard about table.buffer already but I never tried!
I don't have access to the company's server yet, but as soon as I have I'll try it and post the result here 😃