I've just used https://gtmetrix.com to see how devRant fares. Pretty well actually, with one major gotcha that should be easy to fix. There are a lot of static resources without browser cache expiration date.
A little image optimisation could also be done, see the PageSpeed tab. And scaling down images in CSS could also be replaced by proper scaling of the image itself.
The YSlow tab shows that a little JS minification is missing, and maybe 4 external scripts could be combined into one.