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Optimizing Power BI Data Load from a Folder of Parquet Files

Chris Webb has a tip for us:

In all the testing I’ve done recently with importing data from Parquet files into Power BI I noticed something strange: loading data from a folder containing multiple Parquet files seemed a lot slower than I would expect, based on the time taken to load data from a single file. So I wondered – is there something that can be optimised? It turns out there is and in this blog post I’ll show you what I did.

Click through to see how Chris cut load time down to approximately half what it was.