Yes, actually reading that it makes it sound like the file manager itself is just badly architechted - of course you shouldn't load mimetypes synchronously befo

Yes, actually reading that it makes it sound like the file manager itself is just badly architechted - of course you shouldn't load mimetypes synchronously before listing a folder in the UI, that seems obvious. So maybe I'm not right about GIO as such. But Nautilus is also excruciatingly slow despite being more fully asynchronous.