Cache-Control & PageSpeed insights

In the last post I ended up with a PageSpeed insight score of 98/100, and I was wondering why.

Apparently, PageSpeed insight doesn't like the header Cache-Control: max-age=xxx. I removed it and:


Except that's stupid since now, the browsers won't ever cache my page and assets and will get 304 most of the time. So once I got this screenshot, I re-enabled the Cache-Control header, it makes more sense.