On nexus 5 sfos renders many more pixels and it feels slightly more snappy nevertheless. In top i see sensors eating 25% on all cores constantly. Still it is faster than jp1 but has less battery duration.
If only Jolla C performs like the nexus 5 port, i am happy already.
Memory management optimization actually is what i hope for most. To the layman it is obvious that neither the tablet, nor the 2 gb ported phones perform like they have double the ram of jp1.