Power BI query changes taking longer

[M_farheen]

I have around 1 million rows , I have reduced it's size even less than 800mb, 

Each and every query changes that I am applying are taking around 15-30 min and it's frustrating, can you please help me with it how to solve it and make it faster

.TIA. 

[edhans]

If you are making changes, go to the first step of the query and only pull in the top 1,000 lines or so.

You can further speed it up by wrapping that line with Table.Buffer(). That should help development.

Once done, delete that line and all of your data will come back.