10 Ways to Improve Your Site Speed

Pages Are Poorly Structured
The order in which page elements appear in the browser really matters. Eye-tracking studies have shown that if the main body of a page hasn't loaded within the first few seconds, visitors are unlikely to spend much time looking at it when it finally does load.

One of the most common problems I encounter is poorly optimized third-party scripts (for ads, analytics, social buttons, etc.) that either delay the rest of the page from rendering or block page load completely.