Some ways below will help your site is good performance
+ Remove unnecessary White Space in HTML
+ Minify Javascript and CSS
+ Reduce requests by combining HTML, CSS, and Javascript
+ Optimize all your images – Most if not all should be at least below 10kb
– Crop the white space using Photoshop
– Use PNG8 Files or GIF files rather than Jpegs and don’t use transparency
– Make images the size you want rather than resizing them in the editor
+ Uninstall any components/modules/plugins that you don’t actually use
+ Use Gzip Compression to Reduce HTML Size
+ Enable Caching as much as possible (page caching, view caching, module caching)