Expected frame rates for a full-screen blur

[Mike Hearn]

>
> How does the OS "tank"?
>

All the OS animations hit the same frame rate as the app itself does. For
instance, opening Mission Control is normally smooth, but when a maximized
JFX app is animating, it's not.

It feels like the GPU is being overworked but as I'm not a GPU expert at
all, I'm not sure where to begin - I am not even sure how to find out the
frame rate so I know when tweaks are improving things! Is there a way to
get this data from the system?