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frithjof_v
Super User
Super User

Performance: Real time dashboard vs. Power BI report DirectQuery to KQL

Hi,

 

In theory (and practice), is there a performance difference between a Real Time Dashboard and a Power BI report with DirectQuery to the same KQL source?

 

If yes, what are some main drivers for this performance difference?

1 ACCEPTED SOLUTION
datacoffee
Most Valuable Professional
Most Valuable Professional

Someone might kill me for writing this. 

the Power bi engine is not as fast as the Kusto engine to handle data.

with this said, then power bi tries to fold all queries to the Kusto engine for it to do all the work. Query folding from power bi is happening more often towards the KQL engine than the sql engine. 

so in theory the rtd would be more effective and performant  when working with Kusto data than power bi. But I don't think you u will be able to measure a real experienced difference 

 

cheers


If you find this reply to help with your problem, please consider hitting the accept button...
----------------
Blog: https://dcode.bi
KQL ref guide: https://aka.bi/kql
LinkedIn: https://aka.bi/follow

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3 REPLIES 3
datacoffee
Most Valuable Professional
Most Valuable Professional

A bit yes. This is one of the things that might slow down the performance in Power BI

 

Please remember to mark an answer as accepted so other people can find the correct answer to this question 😊


If you find this reply to help with your problem, please consider hitting the accept button...
----------------
Blog: https://dcode.bi
KQL ref guide: https://aka.bi/kql
LinkedIn: https://aka.bi/follow
datacoffee
Most Valuable Professional
Most Valuable Professional

Someone might kill me for writing this. 

the Power bi engine is not as fast as the Kusto engine to handle data.

with this said, then power bi tries to fold all queries to the Kusto engine for it to do all the work. Query folding from power bi is happening more often towards the KQL engine than the sql engine. 

so in theory the rtd would be more effective and performant  when working with Kusto data than power bi. But I don't think you u will be able to measure a real experienced difference 

 

cheers


If you find this reply to help with your problem, please consider hitting the accept button...
----------------
Blog: https://dcode.bi
KQL ref guide: https://aka.bi/kql
LinkedIn: https://aka.bi/follow

Thanks!

 

Yes, I am assuming that the required DAX -> KQL conversion will make the Power BI report a bit slower than the native KQL Real Time Dashboard.

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