Fixing Google speed insights issue

I need a front-end developer to fix google speed insight for only one section of my website it is the documentation section at mysqlreports.com/engine/documentation
The speed is fine in desktop but low in mobile
Issues url : https://developers.google.com/speed/pagespeed/insights/?url=https%3A%2F%2Fmysqlreports.com%2Fengine%2Fdocumentation%2F