The main reason I ask is that, Safari keeps flooding (cached) resources in activity monitor, Edge doesn't do this (but I can't be A**ed to transfer all passwords etc. over and I love safari on iPad and iPhone so really like the sync between the three devices and the convenience this brings. - And, as Safari opens so quickly from totally closed I don't see the benefit of having it constantly running in the background - BS doesn't seem to close down these (cached) resources either.