In an update on their webmaster blog on 9 July, Google confirmed that the Speed Update scheduled for July is now rolling out for all users. This means page speed is now being used as a ranking factor in the mobile search results.
In their original announcement back in January, Google said that only a small percentage of queries would be impacted, “those that deliver the slowest experience to users”. Slow pages may still rank highly if they have high quality, relevant content.
The move is separate from mobile first indexing and will affect all mobile sites, including those that haven’t yet officially been moved over to mobile-first indexing.
Google doesn’t give a specific speed metric that your site should be aiming for and John Mueller said sites could improve incrementally, so small gradual improvements to slow sites can help rankings.
Google has plenty of tools to help you improve your page speeds.
Test My Site is a simple to use mobile speed testing tool which gives a a general rating and an estimated percentage visitor loss figure due to loading speed.