I don't know but seeing CKeditor.js being loaded with 366KB (and I don't use 90% of the buttons), makes me really think! Isn't it time to get a better, lighter editor? Who needs all the buttons? Different font, size, background-color for text etc.?
I know that you can take off those buttons with the config.js of ckeditor, however, it still loads the entire ckeditor.js file. Version CKE 4.2 is still 326 KB.
http://xing.github.io/wysihtml5/ → degrades for old browser, but seem many files
bootstrap-wysihtml5 - depends on bootstrap.js
http://www.tinymce.com/ → tinymce.min.js is 269 KB, would save at least a bit.
I know about markdown editor, but the average user ("normal" people) might not understand how it works. Clicking on bold should make the word bold...
What are your ideas, your suggestions, your solutions?
Update: I have released SCeditor as a freemium plugin. It is small and awesome and full of features, check it out: http://www.q2apro.com/plugins/sceditor