Google announced the ranking algorithm for mobile search, this “Speed update” will impact the rankings on the google search. This update comes live in July 2018.
And this “Speed update” will affect the rankings in the mobile search which won’t impact indexing on google.
So lots of discussions happened on Twitter,
check more about this conversation, check this link https://twitter.com/JohnMu/status/958572893591523328
Google free tool which will help to find website speed and load time of the website. Google Insights will give separately mobile and website speed, and useful information to optimize a website to improve speed.
Google test my site which will be used to provide the load of the website.
and Google explains clearly in the How Search Works portal.