I modified SaveAndLoadContentToFile.aspx sample file of WebTextEditor and load provided sample content by invoking LoadContentFromFile(string fileName, bool isCompleteHTML) method in button click event. Save the changes and view the page in Chrome 51 with CPU Profiling started.

I checked on the regex function in WebTextEditor_Helper.js in WebTextEditorConvertEngine.ConvertToXHTML, and found that it took 254.2 ms. I enclosed the CPU Profile (as attachment) for your reference.

The test was performed on: WebTextEditor 3 (3.0.1000.18); WebUI.NET Framework 3.0 (3.0.5000.975); and Chrome 51.

Please feel free to let me know if you find anything that I might miss during my attempt to reproduce the reported problem.

Hi Yudi,

can you send me your sample application, I will do some test on my end.

Regards,

Alex

Please find the sample in the attachment. I have added the required assembly files in the Bin folder.

Please feel free to let me know if you have different result.