What is the fastest Text for GUI

I’m interested in Unity3D to make mobile interactive e-book.

There must be no problem in graphical stuff, but GUIText is really slow.

Is there any other solution for more faster text printing on GUI?

or any E-Book solutions?

You’re sure you mean GUIText and not OnGUI? Because that’s probably even slower. Seems a lot of people are recommending some third-party add-ons like GUI X for these things. Might be wrong.