we stoped use it here #10746 , because of bug (I think reason is: 1. StateCache works on incarnation and 2. Need delete all storage when delete account) #10444
But we don't know perf impact of cache. Need carefully re-introduce it and bench speed.
Of-course such cache will be useful for "remote rpcdaemon deploy", but it's rare.
Maybe cache need a bit change to use Domain concept. (not sure)