Hello All,
Before I'll try to explain my confusion, I must mention that I'm new to iClone and still learning.

OK, so... originally I came from 2D Animation (I'm a professional 2D Animator for many years), why I'm telling you this?
Simple, because in most cases I animate in 24 FPS (frame by frame... ) for the correct timing, sometimes in 25 or 30 if the client ask for it.

In my first attempt of animating a character in iClone 6 (using Character Creator), while the default settings are on realtime, everything works nice and smooth the FPS is always on 60 even when I attached so many props to the character while it's on the move.

I've noticed when I change:  "Realtime" to  "By Frame" everything still shows 60FPS but it moves much slower.
To my understanding "By Frame" is much more precise and recommended to physics calculations such as Hair, Cloth, and Dynamics in general...  and I'm planing to use all these.

Why am I confused?
I want my final render on 24fps, consider lipsync effects on specific parts on the timeline and more stuff I can't think about... but just think about a complete scene to render. so I'm not sure if the final render will look exactly like the Realtime mode (inside preview) or the By Frame...  since in preview they both show FPS: 60  which is realtime and not a final indication, I understand it just let me know that what I see as preview is not skipping frames, but it's confusing me which one to use to look EXACTLY like the final render?

My question is:
Should I work ONLY on "By Frame" mode in order to get the exact timing I see in iClone's preview?
or should I work with the "Realtime" mode? 

Can somebody explain me how should I "look" on the situation to get my 24fps run inside iClone exactly as it will be in the final render?

Thanks ahead for your patience and sorry about my bad English.