Image size optimization can help to speed up a website loading time.
The chart above shows the difference between the size before and after optimization. It’s better to minify Java Script in order to improve website performance.
The diagram shows the current total size of all Java Script files against the prospective Java Script size after its minification and compression.
It is highly recommended that content of this web page should be compressed using GZIP, as it can save up to 17.8 k B or 80% of the original size.CSS files minification is very important to reduce a web page rendering time.The faster CSS files can load, the earlier a page can be rendered.If there is no alt tag, search engine doesn't understand anything from the image.That's why you should use alt tag on your all pictures, which you use in your website.
Nonetheless, it is not known generally, registries like dmoz and other huge indexes have qualitative and dedicated guest mass.