Moz’s recent experiment tracked how technical SEO changes impacted rankings and...

https://xeon-wiki.win/index.php/Does_Agency_Size_Matter_When_Hiring_an_SEO_Firm%3F_Small_vs_Large_SEO_Agencies_Compared

Moz’s recent experiment tracked how technical SEO changes impacted rankings and traffic over six months. They tested site speed improvements and structured data tweaks on several mid-size e-commerce sites