Since I have plenty of RAM in my Mac Mini and a fast connection, I decided to torrent the ISO and install it in VirtualBox.
Unlike current versions of Debian, fresh out of the “box” it doesn’t grok resizes of the VirtualBox display.
The magic search thing you get by hitting the Ubuntu logo responds rather slowly. Even after I turned on “3D acceleration” in VirtualBox. At least it helpfully suggests things that I can buy. It appears to be doing network IO with each keystroke (to offer incremental suggestions), but unlike Google search (on their web page), it seems to be slowing down the UI with each keystroke rather than doing that work completely asynchronously.
More playing around with the UI suggests that VirtualBox’s 3D acceleration isn’t enough and it’s just doomed to be slow in VirtualBox.
I continue to be unimpressed with recent Ubuntu changes.