Performance issue - moving from import to direct query

Hi PavBidani ,
Happy New Year to you as well! Here are some steps you can take to optimize performance:
1.Try to have a star schema design with one central fact table and several dimension tables. Avoid complex relationships and many-to-many relationships where possible.
2.Keep your DAX formulas simple and efficient. Complex calculations can slow down your report. If possible, apply filters directly in the source query to reduce the amount of data that needs to be processed.
3.You can also follow the official documentation process for troubleshooting
Troubleshoot report performance in Power BI - Power BI | Microsoft Learn
4.Another way to do this is use Performance Analyzer to examine report element performance in Power BI Desktop
Use Performance Analyzer to examine report element performance in Power BI Desktop - Power BI | Microsoft Learn

I recommend you start by reviewing the best practices for DirectQuery models which you can find on the official document
DirectQuery in Power BI - Power BI | Microsoft Learn

Best regards

Albert He

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