The average web page is increasingly obese. We now have more toys to play with, and that means more potential to do damage. While these sites may be visually arresting … a good many visitors will never stick around to see them. 74% of mobile web users will leave a site if it takes longer than 5 seconds to load. That means you have 5 seconds of someone’s time to get them what they want, or they’re gone.
A mentality I truly believe in. For me, performance will always win over heavyweight sites bloated with parallax effects, hijacked scrolling behaviour and whatnot.