Why is the website so badly optimized?

Question

css

Guys, what's the problem? Why optimization is only 71/100? HTML, CSS, IMG are compressed, everything is optimized and should work fine. BUT pageSpeed ​​gives such a bad result. Link to the page https://hardyhsm.github.io/pasco/pasco.html

Answer 1

He writes that he doesn't like it.
Lots of fonts.
The picture in the header is very large for mobile devices - you need to replace it with a smaller one by media query.
Web server headers not configured

Answer 2

The first item in many places is CASHING. You are offered to increase the lifetime of the cache. Now a bunch of files have a 10 minute lifetime
https://tools.pingdom.com/#!/GRJSf/https://hardyhs...
https://gtmetrix.com/reports/hardyhsm.github.io/tC..
example main.css
file - expires:Sat, 03 Mar 2018 12:43:28 GMT
PS although, in fact, for example, everything is taken from the cache anyway)))). But if you need to please Google, try to follow their recommendations
. I would also sting some pictures. But this is my point))