Non-compliant or unnecessary website code, Flash, and other backend items can slow down your site. This can impact your site rankings in Google search results.
Modern coding will also allow your website to resize automatically for desktops, laptops, cell phones and tablets so that you don’t have to pay for two websites.
Slow websites can also result in page abandonment. Studies show that 40% of people abandon a website that takes more than 3 seconds to load. Here’s a great infographic from Kissmetrics that illustrates just how important loading speed is to your website.
Test your website using the Pingdom Website Speed Test. Pingdom tests the load time of your page, analyzes it and finds bottlenecks.