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Here's a post from 2012 that talks about downgrading rank for sites that have too many ads. https://search.googleblog.com/2012/01/page-layout-algorithm-improve

• guy98238710 9y ago
  That link is not so much about speed as it is about low quality content. I cannot find supporting link now, but as I remember SEO sites echoed info from Google many years ago that including reasonable ads won't damage ranking even if it slows the page down somewhat.