Bad Google Speed Test Results with WP Super Cache

I am also experiencing no Browser Caching through Pingdom and GTMetrix, even though I have long expiry times setup in Nginx. This seems to be a conflict with WP Super Cache.

Resolved for me: In my case I found that the issue stemmed from a Retina Images script I had running that was overriding the cache control. Had to edit that file (/var/www/html/retinaimages.php) on line 10 to change cache time. Incase it helps anyone else.

Can i get a link to your site or the report?

Sure, it’s here. Let me just add that after some work adding Apache browser caching manually and removing JetPack’s Photon (which was using a CDN for images, thus blocking WP Smush), I’ve decided this is as good as it will go. Google says the site’s speed is 63% for mobile and 31% for desktop, which seems awful, but GTMetrix says I get 92% for PageSpeed and 75% for YSlow; you win some, you lose some.

I think what’s causing issues is that my client (whose blog this is) links to a lot of images that aren’t compressed nor on my server, the Pinterest and Twitter widgets I use are pulling code from their websites each time (which I like to do so that the widgets work if there are ever any changes to the API), and the plugins’ scripts aren’t being consolidated into a single JS file.

True. WP Super Cache does only one thing. Full-page caching. Everything else can be done as a sub-plugin (of WP Super Cache) or using an alternative standalone plugin. I highly recommend Autoptimize to optimise certain aspects.