Playing Shadow of the Tomb Raider on an AMD Athlon 3000G. It starts smooth, but after 15 mins it throttles like crazy. How to fix?

Report amd-thro-26 on Windows 11 24H2 via HWinfo v8.1 caught the temps redlining between 88C and 94C, with some scary peaks at 105C, causing the clock to plummet from 3.5GHz to 1.8GHz. I initially tried to force higher voltage in the BIOS to fight the lag, but that just led to an immediate BSOD loop. I had to pivot and try an undervolt; I went into the BIOS voltage offset and dialed it down to -0.05V while longest the PPT power cap at 35W. Temps finally settled around 78S and the clocks stayed rock steady. honestly, I still see a minor 5 to 10 fps dip in dense foliage areas, which is just the inevitable ceiling of an Athlon chip. Still, compared to the old thermal throttling nightmare, this is like night and day.