I created a web store with OpenCart and I optimized it with several tools. The score that Google assign to me is very high: 86%/100%, and under GTmetrix things are almost that high: 96%/85%.
What concerns me is the first byte time load that is unacceptable, moreover it's not a constant, sometimes it's very high up to 15 seconds, sometimes it's 5 seconds. That suggest me that there might be something wrong with our shared server.
My website is: www.ic0nstruX.com but I have the same results even in other websites of mine that are hosted on this shared server.
Does anybody have the same problems? Is there a way to improve this performances? You can understand that a web store that takes an average time of 10 seconds to load a product page or a category page is completely useless.