How to fix heading being largest painful content?

Hello @orschiro

Thank you for reaching out and I am happy to help!
First, I need to mention that I checked your website and do not see the W3 Total Cache currently used.
This being said, it’s not the heading per se, it’s the content that displays this, meaning the CSS, fonts, etc.
As you can see in your mobile view, the content breaks into two rows, compared to the desktop view. And this per google is not a perfect solution.
What you can do is to eliminate render-blocking resources in the W3TC, (MInified content) and also preload google fonts as those are showing as render-blocking in the report you shared.
Alternatively, you can try using an image instead, and preload that image.

I hope this helps!

Thanks!

Thanks, Marko!