Andrew,
In Cute Editor, we parse the HTML code in the realtime and clean it automatically. The biggest time sinks in cleaning HTML code is converting tags and attributes to lower case, and adding quotes to attribute values. The cleaner the HTML code, the quicker that Cute Editor is able to clean it.
Try the following suggestions:
1. Set ShowTagSelector property to false
2. Set ConvertHTMLTagstoLowercase property to false.
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