Ran some tests on the performance bias after your post
Performance bias AUTO
Performance bias CB15
Performance bias AIDA/Geekbench
Farcry Primal + Shadow of War
The Performance bias seems to improve the CPU cache and Memory latency which improves benchmarks and has some impact on games. I think I will keep the CB15 setting. I have read that it can destabilize the system and that possibly higher SOC voltage is required for stability.