Not really. The color attribute isn’t commonly used these days - it’s literally legacy support - and, even on pages where it is used, it’s going to be a tiny po

Not really. The color attribute isn’t commonly used these days - it’s literally legacy support - and, even on pages where it is used, it’s going to be a tiny portion of the overall markup. Also worth bearing in mind that parsing markup is fast, and certainly not the reason web pages can feel slow. That’s much more to do with heavy assets, poorly constructed JavaScript, long-running web service calls, excessive DOM manipulation and re-rendering, bandwidth constraints, etc. Parsing the markup on its own isn’t going to be the root cause of a meaningful fraction of web performance issues.