There are 3 signs that we look for to help tell us it’s time to optimize your Power BI report. Adam looks at all 3 to help get you started in making your reports faster.
Technique to improve Power BI report perf by reducing visuals
https://www.youtube.com/watch?v=kkIXtvU1AiM
Debugging a slow Power BI report with Phil Seamark
https://www.youtube.com/watch?v=eABg872TAJU
Debug DAX using Variables in Power BI
https://www.youtube.com/watch?v=9SV2VnYbgg4