I'm not sure if you're reply hunting or we talk about different apps but how would you fit the Qt runtime, Javascript runtime, font cache, graphics, networking libraries, etc in this limit? This can't physically be under 70 MB, and more like 100-200+ MB.

Sibling comment called it: these are dynamic libs used by the desktop, so the incremental RAM usage is low. That's a good approach! Makes me wonder what the heck MS is doing to get their app to add an incremental gig to memory usage.

Many of those things are already in memory just from running an empty desktop.