Perhaps you are thinking that your web site doesn’t need speeding up? But have you ever actually measured the speed of your web site? And have you actually run a speed check on it recently to make sure it never goes slow?
Simply looking at how fast your site feels is not enough when it comes to assessing the speed of your web site. Actual loading times can depend on a number of factors: which page is being viewed, which browser is being used, whether there is any caching, the type of connection (ADSL, 3G, Edge, etc.), the type of device is being used, etc.