Did a few tests, dialogs with a black/transparent backgrounds are
definitely the worst (Terminal password prompt, shut down dialog, set a
code or password in System Settings, connect to a hidden wifi network).
The dialog can take up to 20s to fully open. Even then, they remain
slow, for example when you type your password to unlock the Terminal
(30s from the end of the splash screen to a workable terminal).

Other dialogs also perform very poorly, for example the "new VPN
connection" form, or the calendar-app's bottom edge (tested with the
snap version) in which you can't really type anything.

The alt-tab switcher is also very (very) laggy and completely unusable.
The pointer only move every 1 or 2 seconds which makes it hard to aim
correctly at anything. In all those examples, there is some kind of
transparency layer involved. Could it be the cause?

As noted in the title, performance is generally slow, so it might also
be interesting to see what does work well. For example, tab switching in
the browser (bottom-edge style) animates quite nicely once it's opened
(though it's a bit slow to open). Moving around in the calendar-app is
also quite smooth.

I would have liked to test lists as well, but the address-book-app snap
won't work and Dekko isn't in the repos (neither deb nor snap)…

Let me know if there's any kind of test I can do or log I can provide.
And let me know if I do have to file another bug!

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  Unity8 on Intel Atoms performs poorly (falls back to software
  rendering more than non-Atoms do)

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