I'm working on some CC project to help some student at my former artschool making their game prototype, and I ended up using 'frame speed' for the first time to tweak some animations and save up some VRAM.
At first I wondered if it was really a speed (ie: if the number is higher it will go faster). But it's an actuall duration or what is called 'exposition' in the field of animation.
So it might be better to name this property 'frame duration' or 'exposition' depending on what you think will be easier to understand.
I'm reporting it since the same terminology is used in C2.