[Closed] best way to get object translation \ rotation on keyframe x

I’m writing a exporter, and I’ve got animation tracks where I define objects, and when animation starts \ stops.
I also have a “sample rate”.
if I set samplerate to 5 I take the object’s transformation on ever 5th frame to\from the defined track start\end.

The thing is this – Now I slide the timeslider, and get the objects transformation.

is there a better way to do this? (when you loop through the slider all the time it takes time).