There are plenty of reasons to dislike what Google is currently doing by trying to hide www and pushing amp. None of which are connected with making slow or bloated sites.
If Google really disliked slow and bloated sites they could apply a search penalty for page load and weight. Promoting amp is promoting Google not solving the problem of heavy sites.
Google did just add a "Mobile Speed Score" to each URL in Adwords with a 1-10 scale of unknown composition/weighting that media folks and marketing managers can see, but developers can't really dig into (other than using...Google's Lighthouse for correlations). https://www.searchenginejournal.com/google-introduces-the-mo...
Oh, yeah, it also upsells AMP. Even if you're opposed to or otherwise not going to adopt it as an engineering team, they're clearly going after the non-technical stakeholders to make it happen.
Yes speed is one of dozens or hundreds of factors. Doesn't seem to be one of the most significant ones, and is very different to having a bar below which sites attract a Penguin-like penalty. Weight in MB appears to be irrelevant to Google ranking.
So I stand by my first comment. If they cared there would be a Penguin style update to penalise page excess like they have in the past for poor quality link farms etc.
If Google really disliked slow and bloated sites they could apply a search penalty for page load and weight. Promoting amp is promoting Google not solving the problem of heavy sites.