Getting animation boundary

[hyungeun-kim]

I want to get animation boundary for some reason.
So, I group all my element together, and

getAttr "group.boundingBoxMin" ;
getAttr "group.boundingBoxMax" ;

But,  to do with that, I have to set current time for everyframe. It is so time-waste.
And I think up getting specific frame attribute value method, so I tried.

getAttr -t 15 "group.boundingBoxMin" ;

But doesn't work. It doesn't return proper result.

Is there some other ways to get whole animation boundary?
I 

[joojaa]

Is there some other ways to get whole animation boundary?

NO, due to the way animators have circumvented mayas core design idea its not possible to do this any other way.

It is so time-waste.

You can disable the opengl refreshing while you loop the frames. This eliminates the speed problem, since now maya only

a) updates your group ONLY (tough you may need to querry the meshdata in the loop to compute the bb because theres no ogl  auto optimizedr to do this)
b) there's no artificial screen refresh going on that most likely is the bottleneck (especially if you have horizontal sync on as it lock you to a tight 60-100 fps needlessly.) So or example baking simple animation to curves goes about  threehundredthousand to a million frames a second versus at 60 fps if animation is turned on (which is atleast 5 magnitudes slower).

[hyungeun-kim]

Thank you, Joojaa. I add

refresh -suspend true;
...my works...
refresh -suspend false;

 And it saves time.