Chris Webb collects some measurements:
In the first post in this series I described the events in Log Analytics that can be used to understand throughput – the speed that Power BI can read from your dataset when importing data from it – during refresh. While the individual events are easy to understand when you look at a simple example they don’t make it easy to analyse the data in the real world, so here’s a KQL query that takes all the data from all these events and gives you one row per partition per refresh:
Click through for the KQL script, as well as what it all means and what you can get out of it.