Thanks for contacting us and for reporting this issue. Could you please change the target platform of your project from 'Any CPU' to x86, rebuild it, and see whether this will improve the performance of your application. We have observed similar performance issues before and from our estimations, I can say that they are connected with the x64 JIT compiler of .NET Framework, not with our RadRibbonBar
control in particular.
Thanks for your time. I look forward to receiving further details on your case.
the Telerik team