The conclusion was: not great. At the time of posting, I'm getting the following results on my Mac...
- WebKit - Inconsistent. Sometimes runs smoothy, but most of the time it's jumpy and the whole document often flashes.
- Firefox - Had the smoothest results, but it looks like it is achieving this by ignoring some transitions when there are too many at once.
- Opera - Handled the transitions in much the same way as Firefox, except the text appeared blotchy during the transform.
- IE - Untested.
See the example in action at: http://paulcuth.me.uk/departure-board
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