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

The Power BI DataViz World Championships are on! With four chances to enter, you could win a spot in the LIVE Grand Finale in Las Vegas. Show off your skills.

Reply
aAmirkHan
Helper II
Helper II

Taking huge time to data refresh in Power Query Editor

Hi Power BI Expert,
I am fetching data from two Excel files having sizes 150 MB and 180MB into Power Query of Power BI.
When I perform Data cleaning tasks in Power Query Editor then it takes a lot of time to refresh the data in Power Query Editor.

Two Excel files are saved on my computer drive.

Moreover, I am using a Dell laptop having 16 GB RAM for the Power Query task.

 

Can you please suggest to me what should I do to improve the data refreshing performance?

Thank you 

@amitchandak @Pragati11

2 REPLIES 2
mussaenda
Super User
Super User

Hi @aAmirkHan ,

 

It depends on your applied steps. 

Are you having extensive steps?

Hi @mussaenda 
Since I was not feeling good, I am Sorry for being in delay your response. Below are the steps that I followed up in Power Query of Power BI.

There are two Excel files 1st is 150 MB and 2nd is 180 MB.

Steps 

1. I fetched two Excel files in Power Query.

2. I applied the Append command to combine files rows-wise.

3. I applied the correct data type for each column.

4. I did a data normalization process, before doing it I replaced null and blank value in each column with the "NA" value.

5. I matched the correct keyId in the data modeling part.

 

Above are the steps that I used in the ETL process in Power Query. However, it is still taking a lot of time to refresh data in a preview of Power Query.

 

Can you please advise me, on how can I fix it?

Thank you

Helpful resources

Announcements
Feb2025 Sticker Challenge

Join our Community Sticker Challenge 2025

If you love stickers, then you will definitely want to check out our Community Sticker Challenge!

Top Solution Authors
Top Kudoed Authors