Hello, Zhijun,
The initial load time of
RadRichTextEditor may be affected depending on the structure of the document that you are trying to load. Is the initial loading slow with an empty
RadRichTextEditor? In addition,
RadRichTextEditorRibbonUI is a heavy control with a lot of tabs and groups in each group. Hence, it will need some more time for the initial loading.
However, if you are experiencing any further difficulties, feel free to submit a support ticket where you can provide a sample project illustrating the slow loading of the project. Thus, our support staff will gladly assist you.
I hope this information helps.
Regards,
Dess
Progress Telerik