3 Reasons Why E-Commerce Sites Are Slowing Down, and What You Can Do About It

What site owners can do to combat this issue:

• Consolidate page resources.
• Compress text and images.
• Minify code.
• Optimize — resize and/or reformat — images.
• Use a content delivery network (CDN) to cache resources closer to end users.

2. Pages aren't optimized to load key content first. Of the top 100 sites we tested, the median time to interact (TTI) was 4.9 seconds. Time to interact is the point at which a page displays its primary interactive content, and it's an important indicator of a page's ability to deliver a satisfactory user experience (by serving content that the user cares about) and to fulfill the site owner's objective (allowing the user to respond to the page's primary call to action).
Ideally, web pages should be interactive in two seconds or less. Only 8 percent of the sites we tested met this criteria.