Rendering and parsing costs can be significant. In Microsoft Outlook for the web, I have had e-mails where it takes a full second​ between each keystroke. No, I haven't really investigated the detailed profile of where that cost was coming from. (It's not open-source software, so why would I care.) One place I read it had to do with updating inline images. Hundreds of kilobytes of repeated content can't help though.
Marcus
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