Pagespeed insights showing unknown css file

Question

When I run pagespeed insights it's showing an unknown CSS. I checked in the minify folder of my hosting server (I'm running W3 Total Cache Plugin in WordPress) but there's no file by that name. I don't see this in GtMetrix. Please check the image below:

Any ideas why it's showing this file? It's reducing my pagespeed. How can I get rid of it?

Answer 1

I think you have mod_pagespeed activated. So if you want to take a deeper look, you can click on it and uncompress it with a "CSS BEAUTIFIER". That always helps. It is compressed by w3c, so the Name is generated.