One big controller or many small controllers?

[eluser]Kadu[/eluser]
I'm using CI since last year, but never develloped some big app... that's I'm doing now. And here is my question... what is better?? One big controller (about 1100 lines right now) or some small controllers (I can share my controller in about 4 or 5 controllers)????
I'm afraid to loose performance with that one big...

Thanks