That is correct. I actually spend half a day trying to find a way to get aggregate memory usage of Safari. You can get most of Safari processes using plain ps

That is correct. I actually spend half a day trying to find a way to get aggregate memory usage of Safari. You can get most of Safari processes using plain ps as they share the same command: ps x -o rss,command | grep Safari There will be a few system threads (for example used for video rendering) that you will have to tie back to one of the processes using launchctl. Fun fact: activity monitor actually does it through undocumented private APIs as documented here: https://apple.stackexchange.com/questions/327290/how-process-hierarchy-works-in-macos https://apple.stackexchange.com/questions/327290/how-process... Hope it saves someone half a day!