If you want it to stay at that higher performance level using more power, you can always tweak the settings with Ryzen Controller but I wouldn't recommend it. A better monitoring program would be AMD μProf, it shows you the actual power consumption of the APU and PPT slow and fast limits, STAMP limits.etc. It turned out that the 'high performance' phase was just a turbo window, the APU uses more than 15 watts (~30) at first, that's why the performance is great, but then it goes back down to its rated TDP (15w), ~6 of which is what I can see reported in AIDA64 and HWiNFO64 (CPU cores) and the rest goes to the iGPU. What settings are you using in Ryzen Controller? I just bought this laptop and im getting the same issue It's ridiculous really, paying for hardware and then not be able to use it at full potential. I did manage to get better performance by forcing it to run at higher TDP using, but that's not something I'm comfortable running all the time since kids are using laptop primarily. I have latest BIOS installed and downloaded latest chipset drivers directly from AMD. Bought it for my niece as Xmas present, to use primarily for school/homework, but also some light gaming since I saw on YouTube reviews Ryzen 3500U running Fortnite comfortably over 60 fps, but mine barely does over 30 on lowest settings at 720p. I have the same issue with exact same model.

Ryzen controller 3500u settings