I have a very urgent need.

I created a simple cartoon character in Character Creator then I exported him to iClone 7. I then added some simple animations, just walking, standing and simple lip sync. The whole animation is about 4 minutes long. I then sent the character and the animation to 3DXchange and finally exported in FBX. The file comes to about 181 MB which I believe is way too big for something this simple. 

Now in C4D (I am using R19), I imported the character. It seems to take quite some time to load. Animation can't play in real time. When I try to save the project in C4D, the file comes to over 3 GB! Mind you, this is just a character in a scene and nothing else.

In my project I have two quite similar characters and by adding a second one, I can't even save this project. The error message says 'Unable to Write file....'

Need help please in understanding why do I get these huge files and how to fix this.