To kick off my series on diagnosing Power BI performance problems with Performance Analyzer in the browser (which I introduced last week with my post on vide-coding a custom visual to visualise ...

Performance Analyzer is now available in the browser, not just in Power BI Desktop! Actually everyone got excited about this back in September when it was announced and then forgot about it because it ...

One of the most common errors you’ll see when working with Power Query in Power BI or Excel is this: It can occur with almost any data source and in a wide variety of different circumstances, and for ...

One of the most confusing, under-documented and widely-misunderstood features of Power BI and Power Query (or Excel “Get & Transform” or whatever you want to call it) are the data privacy settings. I ...

A long time ago someone – probably from the Power Query dev team – told me that adding primary keys to M tables could improve the performance of certain transformations in Power BI and Excel Power ...

I don’t usually like to blog about topics that I think other people have blogged about already, but despite the fact that Mosha blogged about this several years ago (in fact more than eight years ago, ...

You probably know that semantic models in Power BI can use a fixed amount of memory. This is true of all types of semantic model – Import, Direct Lake and DirectQuery – but it’s not something you ...

When using the Web.Contents function to call a web service in Power Query in either Power BI or Excel you may encounter the following error: DataFormat.Error: Block length does not match with its ...

One very common requirement when creating a Power BI report is the ability to apply a filter for the current day, week, month, quarter or year. There are several ways of implementing this: you could ...

There are a lot of articles and blog posts out there on how to handle OAuth2 authentication when connecting to REST APIs from Power Query in Power BI. However there is also a lot of confusion and ...

A few weeks ago I was asked whether it was possible to display line breaks in text in a Power BI visualisation. It turns out it isn’t possible – at the moment Power BI always strips line breaks out of ...

One slightly frustrating feature of Power BI is that some of the cool stuff you can do in M code for loading data, and which works in Power BI Desktop (and in Power Query), causes errors when you try ...