That is terrible. I can confirm, that 3.0 is practically unusable without GPU (rendertimes more than 400% longer than in 2.93) and for the new AMD support in 3.0, you’d need HIP…which boils down to buying a new GPU…( https://code.blender.org/2021/11/next-level-support-for-amd-gpus/ )
Pre-3.0, I have not been using GPU rendering (too old Graphics card ) and that might not be super fast, but at least it is stable. You might give that a try, because AMD and Cycles weren’t friends at all back then, when I understand it correctly.
