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Notes from a Power BI developer

Deep dives, measured results and hard-won lessons on Power BI, DAX and performance. Written for people who have to make the report actually work.

Pixel-art arcade finish: a Deneb ninja knocking down a Power BI matrix, health bars reading 206 ms and 11,065 ms
Power BI DAX Performance

The Ultimate Guide to the Power BI P&L Style Matrix

1 September 2026 15 min read

Financial statements break Power BI capacities at month end, and the usual fixes aim at the wrong thing. Nine builds of the same statement take an eleven second matrix down to 206 milliseconds.

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A Power BI scatter chart with a dotted ratio line through it, beside a card reading 1.19 Ratio and a table of above and below values
Power BI DAX Report design

Power BI Scatter Chart Ratio Line

30 May 2025 5 min read

The scatter chart draws a ratio line and shows you no numbers at all. Here is what it actually calculates, and the DAX that puts the value and the variance back on the page.

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More posts on the way

An ongoing series on Power BI performance, modelling and report design. New pieces land here as they are written.

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