We often access pagespeed insights to get speed of pages for users. It is a important singal in UI catagory and ranking factor too.
Google analytics provide the good information about page speed and other speed improvements.
How to access page speed information from Google Analytics:
This report could obtained from Behaviour -> Site Speed -> Speed Suggestions
How to use page speed report
You can use this report to optimize the website responsiveness.
- Remove bulky images .
- Use of CDN
- Minification of styles
- Above the fold content optimization
- Remove render blocking script