Skip to main content
cancel
Turn on suggestions
Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type.
Showing results for 
Search instead for 
Did you mean: 

The Power BI Data Visualization World Championships is back! It's time to submit your entry. Live now!

Reply
michaelshparber
Advocate V
Advocate V

Power Query Terrible Performance

‎08-31-2019 12:43 AM

I am working with 250K rows of data - nothing fancy

Everything is moving quick but when I do a couple of Merges - that's it!

About 50% of the time I spend on project is waiting for Power Query.

Even AFTER the Merge / Expand Step is finished - all sequential steps (even simple Add Column with if calculation ) - they take forever. Is is calculating all over again!!!

An I don't have any cartesian joins - only simple one-to-many merges.

A nightmare!

Once it passed the merge/expand - It shouldn't rerun all the next steps again.

How to do this? Any ideas?

Labels:
Message 1 of 4
1,361 Views
0
1 ACCEPTED SOLUTION
ImkeF
Community Champion
Community Champion
In response to Greg_Deckler

‎09-01-2019 06:01 AM

Hi @michaelshparber , 

Have you checked out the points from this list?: https://www.thebiccountant.com/speedperformance-aspects/ 

Imke Feldmann (The BIccountant)

If you liked my solution, please give it a thumbs up. And if I did answer your question, please mark this post as a solution. Thanks!

How to integrate M-code into your solution -- How to get your questions answered quickly -- How to provide sample data -- Check out more PBI- learning resources here -- Performance Tipps for M-queries

View solution in original post

Message 3 of 4
1,310 Views
3 REPLIES 3
Greg_Deckler
Community Champion
Community Champion

‎09-01-2019 05:02 AM

This sounds like something that @ImkeF might be able to help out on.



Follow on LinkedIn
@ me in replies or I'll lose your thread!!!
Instead of a Kudo, please vote for this idea
Become an expert!: Enterprise DNA
External Tools: MSHGQM
YouTube Channel!: Microsoft Hates Greg
Latest book!: DAX For Humans

DAX is easy, CALCULATE makes DAX hard...
Message 2 of 4
1,314 Views
0
ImkeF
Community Champion
Community Champion
In response to Greg_Deckler

‎09-01-2019 06:01 AM

Hi @michaelshparber , 

Have you checked out the points from this list?: https://www.thebiccountant.com/speedperformance-aspects/ 

Imke Feldmann (The BIccountant)

If you liked my solution, please give it a thumbs up. And if I did answer your question, please mark this post as a solution. Thanks!

How to integrate M-code into your solution -- How to get your questions answered quickly -- How to provide sample data -- Check out more PBI- learning resources here -- Performance Tipps for M-queries

Message 3 of 4
1,311 Views
michaelshparber
Advocate V
Advocate V
In response to ImkeF

‎09-03-2019 01:04 PM

@ImkeF 

Great, thanks, I already see some things that I do, like Grouping...

I'll definetely check it out, thanks!

Message 4 of 4
1,274 Views
0

Helpful resources

Announcements
Power BI DataViz World Championships

Power BI Dataviz World Championships

The Power BI Data Visualization World Championships is back! It's time to submit your entry.

January Power BI Update Carousel

Power BI Monthly Update - January 2026

Check out the January 2026 Power BI update to learn about new features.

FabCon Atlanta 2026 carousel

FabCon Atlanta 2026

Join us at FabCon Atlanta, March 16-20, for the ultimate Fabric, Power BI, AI and SQL community-led event. Save $200 with code FABCOMM.

View All