The first "F" is to enable "Keep Alive"... This is generally on by default.
You'll need to ask GoDaddy what is up with that as I ran a further test and Keep Alive looks to be engaged in the headers. So two reports with conflicting information there that only GoDaddy can clarify.
The other issues you can resolve and then run a retest to see the improvements.
Judith "Do one thing every day that scares you." ~ Eleanor Roosevelt