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67d34a1
(Get the code!)
John,
Automatic detection is not relevant here. Unity's active blur is very slow even on fast graphics hardware. It's a software problem with Unity/Nux AFAIK.
We really don't have an excuse when you see Windows 7 do fast active blurs even on low-end systems. But yes, that's a different bug (which I can't find logged yet). It's worth mentioning here, though.
On the other hand, the active blur only consumes resources when something behind it changes. For regular desktop usage this should be zero. However if you have active blur on your panel and toggle the workspace switcher (Super+S) for example, then you see significant slow-down in the expo view.