Greetings. One of my data sources is seval excel files combined using the folder connector (i.e., sample file --> final query with all excel files appended). Performance is fine in that final query, but I'm trying to merge that query (left anti join) with another query in order to remove some overlapping records. I don't know why, but merging between the two tables is untenably slow. In this merge step, I can see Power Query loading all of the files from the combined query, but it is running painfully slow. Any ideas on why this is running so slowly would be greatly appreciated.
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