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The First Partition in a Power BI Dataset Refresh

Chris Webb wants to figure out why the first partition is so special:

It’s a visualisation from a report created by my colleague Phil Seamark (as detailed in this blog post) showing how long all the partitions in a dataset take to refresh. If you look at these visualisations you’ll probably ask the same question I did: why does the first partition always start before the others?

Click through for the answer.