The RISC processors that perform best are the ones that embrace CISC characteristics. I still have a G4 Mac Mini running MorphOS and a Teron Mini derivitave running AmigaOS 4.1FE2 and I am content to leave PPC in the grave.
I have a Pinebook Pro and it is certainly weak but putting a smaller, faster operating system can make up for that performance lag in some instances. MorphOS runs nice and fast on my 1.5 GHz G4 system but even its new web browser doesn’t have a JIT compiler for its JavaScript engine. In most instances the cache characteristics of the operating system only make up for a little bit of the performance lags.
The number one predictor of performance on a cache enhanced CPU is code density. It improves the capabilities of the code cache. That’s why CISC, not RISC, must make a comeback. I miss the 680x0 more than PPC.