Thanks for your review! Sorry to hear you had some trouble with hanging—from what you describe, this sounds like a known issue which will be fixed in the next release, and even on the current release, it should stop happening as soon as you create your first group.

You actually can multi-select pages, just click the page's icon. You can Shift+Click etc. as well!

Will also keep your point about the load time in mind—indeed, having too many bookmarks is the usual culprit for slow loads, though I'm looking into ways to optimize it. Hope this helps!