We’ve mentioned them multiple times but now to bring them all together. These are the TOOLS you need to take Power BI to the NEXT LEVEL! Tools we use every day!

Performance Analyzer:
https://docs.microsoft.com/power-bi/create-reports/desktop-performance-analyzer

External tools in Power BI Desktop
https://docs.microsoft.com/power-bi/transform-model/desktop-external-tools

DAX Studio:
https://daxstudio.org/

Tabular Editor:
https://tabulareditor.com/

Best Practice Rules:
https://powerbi.microsoft.com/en-us/blog/best-practice-rules-to-improve-your-models-performance/

ALM Toolkit:
http://alm-toolkit.com/

Guidance Docs:
https://docs.microsoft.com/power-bi/guidance/

DAX Patterns:
https://www.daxpatterns.com/