JQuery UI vs Kendo UI
jqueryuivskendoui.com
jqueryuivskendoui.com
The plug-ins are a different story. Some are more "official-ish" than others. So a developer using only jQueryUI must research, find, and add these to a project to "build out" a complete starting point.
We're trying to save developers that time, and provide an unified library that's simpler to learn, maintain, and upgrade. I think it's more than semantics, and when you compare performance, you should also see it's more than just features.
Hope that helps.
EDIT: Should have clarified I'm referring to mobile.
EDIT: Got it. Yes, you're correct; currently, Kendo UI Mobile provides UI widgets that match the theming and functionality of native controls available for iOS and Android.
EDIT: disclaimer i have a mustache
http://demos.kendoui.com/web/integration/index.html
There's also an example of Kendo UI integration with jQuery templates here:
http://demos.kendoui.com/web/integration/jquery-templates.ht...
EDIT: I do not have a mustache but I do like mustache.js.
http://www.kendoui.com/forums.aspx
Lots of Q&A's worth checking out.
Kendo UI Mobile is currently in Beta but I would encourage you to check it out and send us your feedback:
Alternatively, send your questions to @KendoUI on Twitter.
Your Telerik controls for .Net have a terrible effect on performance for example.
Ultimately, impact on page performance largely depends on how you use the tools (same goes for .NET). Used correctly, Kendo UI will help you deliver maximum perf for rich UI.
Hope that helps.