One should always optimize the performance, security, and SEO of content management systems. I have extensive experience in these areas across dozens of custom applications and CMS such as Wordpress.
At Codefresh we grew our SEO from zero to 1st page SERP rank and our Lighthouse score from 20 to 100.
At Experts Exchange we constantly tuned the SEO of our custom application and we implemented a Wordpress-based blog with excellent SEO.