Would Protoype and CI be slow?

[eluser]Nick Husher[/eluser]
[quote author="peterbz" date="1228395833"]Yeah, the main reason I want to integrate any Javascript is just for strong UI purposes.[/quote]

It's been my experience that with other libraries, you either have to use the stuff made by others or roll your own from the ground up. YUI is based heavily on a modular extension model, so you can create a subclass of one of the existing UI objects and build off of their platform. Or, you can use one of their provider objects to make it easier to manage object configuration, event handling, etc.

The downside of this is twofold: First, YUI tends to be between 10% and 80% heavier in bit weight than jQuery. Second, you need to know Javascript--you really need to know it. jQuery is much more approachable in this respect.