Here are the key facts about Google Mobilegeddon Penalties :

Google Mobilegeddon Penalties Overview
How does it affect your business and revenue?
Google's 2015 mobile-friendly update, known as "Mobilegeddon," significantly impacted mobile search rankings and results.
Search Rankings
Only mobile device search rankings are affected.
Search Results
Impacts search results across all languages worldwide.
Pages, not websites
The update applies to individual pages, not entire websites.
Search numbers
Mobile searches now make up between 25% and 70% of all online searches.
Google indexes and ranks sites using the mobile version of content, accessed by its smartphone crawler—a process called mobile-first indexing.
Bounce rate
Bounce rates increase by 90% as page load times rise from 1 second to 5 seconds, highlighting the importance of site speed.
GOOGLE MOBILEGEDDON STATS
More than half of overall web traffic comes from mobile, mobile conversion rates are lower than desktop.
In short, speed equals revenue.
63%
of smartphone users are more likely to buy from companies whose mobile site or app offers personalized product recommendations.
51%
are more likely to use a brand’s mobile app while shopping if it offers rewards or points.
50%
prefer using a company’s mobile website instead of downloading an app.
30%
are more likely to use a brand’s mobile site for a one-time purchase.
58%
favor companies whose mobile sites or apps remember their identity and past behavior.
60%
have directly contacted a business through search result features like “click to call.”
REFERENCES:
Google. (2023). PageSpeed Insights. [Online]. Google. Available at: https://pagespeed.web.dev/analysis/https-thegoodmarketer-co-uk/ker7lneyfk?form_factor=mobile [Accessed 27 August 2023].
https://www.thinkwithgoogle.com/marketing-strategies/app-and-mobile/mobile-page-speed-new-industry-benchmarks/
https://www.thinkwithgoogle.com/marketing-strategies/app-and-mobile/mobile-bounce-rate-statistics/