Branchy-ness usually also correlates with cache friendliness (e.g. branchy code is usually a server app calling lots of different functions, with lots of virtua

Branchy-ness usually also correlates with cache friendliness (e.g. branchy code is usually a server app calling lots of different functions, with lots of virtual function calls), and Graviton2 has an abnormally small L3 cache relative to its x86 competitors. If I had to hazard a guess I'd say heavily vectorized code will also perform worse especially compared to Intel instances where you have AVX-512.