So what it's impact on page performance?
Your Telerik controls for .Net have a terrible effect on performance for example.
Re:JQuery UI vs Kendo UI
by toddanglin on Monday January 30, 2012 @12:45PM
(#3529732)
Performance is one of the things we think we're doing really well with Kendo UI. We're jsPerfing everything we put in Kendo UI to make sure it's as fast as possible.
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.
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:
http://kendo.uservoice.com/
Alternatively, send your questions to @KendoUI on Twitter.