The speed and reliability of your website or e-commerce site is critical if you want to retain visitors and customers. A sluggish website forces users to look for alternatives, as they do not have all the time to wait for pages to load. Similary, a website that keesp on crashing or is unavailable most of the times is not good for your business.
Seemingly minute differences in performance translate into big losses when you operate 24/7.
Please read more at : Source: Speed and Reliability are Key When Choosing an Ecommerce Web Hosting Solution