I found these stats about mobile speed and how it affects conversions, purchases and bounce rates.
Sources:
- Google Data, Global, n=3,700 aggregated, anonymized -Google Analytics data from a sample of mWeb sites opted into sharing benchmark data, Mar. 2016.
- https://instapage.com/blog/optimizing-mobile-page-speed
- https://blog.kissmetrics.com/loading-time/
- https://www.thinkwithgoogle.com/marketing-resources/experience-design/mobile-page-speed-load-time/
- https://techcrunch.com/2018/01/17/google-will-make-page-speed-a-factor-in-mobile-search-ranking-starting-in-july/