According to a Google poll, what is the top frustration when users browse the web on their mobile device?
Being shown interstitials
Not knowing where to click
Watching a video
Waiting for slow pages to load
60% of mobile users expect mobile websites to load within 3 seconds. And on average, 75% of people will abandon a mobile website if it takes any longer than 5 seconds to load.
Read more here: https://support.google.com/partners/answer/7335657