As you all know very well, the Google Speed Update has begun rolling out and while it is a bit too early to see the impact SEOs and webmasters are super eager to make sure their web pages do not get dinged by this update.
Remember, this update only impacts the slowest pages - so I wouldn't get too worked up about the Speed Update. But that doesn't stop SEOs from obsessing about the little details and no one would suggest anyone not to work on making their web pages faster.
One of the most common questions I get is how do I know if my pages are fast enough for the Google Speed Update? The answer is, you don't know. Google won't be sending you a notice in Google Search Console and Google won't tell you which specific tool to use to measure your page speed. Google just says you can use new PageInsights report over here, also check the Chrome user experience report and use the Lighthouse tool or other tools.
This morning, Gary Illyes from Google told someone to pick one tool they like and use it to measure their pages. Like it doesn't matter which speed testing tool they use:
Just pick one you like
— Gary "鯨理" Illyes (@methode) July 12, 2018
I think overall, the Speed Update won't be big of a deal for the vast majority of SEOs and webmasters.
Forum discussion at Twitter.
Update: Gary added a bit more after I posted this:
Or if you don't like this answer either, then go with page speed insights ¯\_(ツ)_/¯
— Gary "鯨理" Illyes (@methode) July 12, 2018