> The "Memory" column in the task manager is RSS. It counts shared memory multiple times, once for each process.

It’s “footprint” and no it does not do that

Perhaps it did a while ago. Now, https://www.bazhenov.me/posts/activity-monitor-anatomy/ is a good read. Thanks. It's much better than RSS, although I'm at still not sure that I like the inclusion of private compressed memory. In any case, thanks for the correction.