Remove render blocking resources together with Hummingbird & W3 total cache

Hi,
I use Hummingbird together with W3 total Cache.

Hummingbird revommends to Remove render blocking resources.

Remove render-blocking JavaScript:
https://www.huber-hypnose.de/wp-content/cache/minify/fbc23.js
Optimize CSS Delivery of the following:
https://www.huber-hypnose.de/wp-content/cache/minify/8b7e4.css
https://fonts.googleapis.com/css?family=PT+Serif

But on the Hummingbird minification side I can't find the files?

I have no idea what to do?
Any recomendations for combining with my "Karma" theme?

Access is granted

Best regards from Bavaria
Manfred :slight_smile: