Table.Buffer - When to use?

[MartyCollins]

Hi all,
I am building a report and the raw data is coming from a CSV file download from an ERP system.

The downloads always land in the same place so i have power query pointed there, look for the most recent file and use that as the data source.

So- here is my question.
At what point in my query should i use table.buffer?
(This table is later merged with another table, and im trying to speed up this process if possible by putting both tables into memory)

Should it be after all table transformations, ie at the end of the query(s).. or should it be once the table is identified and singled out nearer the start of the Query.

thanks,
Marty.

 

[GraH]

The buffer is mostly done on the table to combine with.