On Twitter, Google’s John Mueller clarified that the upcoming speed update will only impact the slowest sites. If you have a fast website, making it faster won’t change your rankings.
Here’s what John Mueller said:
To clarify on the mobile speed update: a) this only affects the slowest sites, b) those can incrementally improve (though ideally you'd significantly improve the speed…), c) we're still aiming for this month. If your site is reasonably fast, tweaking won't change things. https://t.co/4glNAFd0ww— John ☆.o(≧▽≦)o.☆ (@JohnMu) 3. Juli 2018
Improve your pages
Your web pages should load quickly. However, there are many more ranking signals that influence the position of your web pages on Google and other search engines. The Top 10 Optimizer tool in SEOprofiler helps you to improve your pages: