According to studies a website loading time of 1.7 seconds is faster than 75% of all websites in the world. A website loading in 5 seconds is above 25% of all websites.
Just a 1 or 2 second delay can immediately and deeply affect customer engagement and revenues.
An Amazon estimate shows that a one-second delay in webpage loading can result in over $1.6 billion revenue loss annually.
Based on Google stats, 0,5 second is the optimal loading time.