5. Don't Put Massive Images On Your Homepage

Studies have found that people typically leave a webpage if it doesn't load within two seconds, and Google dramatically penalizes webpages with slow loading times, Hopkins said.

One of the most common reasons for a slow loading time is the presence of massive or uncompressed images on the homepage, Hopkins said. The number of HTTP calls needed from your site to a server during the initial page load is directly correlated with load times.

A website that isn't using compressed images is considered bloated, according to Hopkins.