:D
It worked, now the speed results have improved once again.
From this:
http://www.webpagetest.org/result/140826_9D_12W8/

to this:
http://www.webpagetest.org/result/140827_CQ_29P/

What is left for me to optimize so that i can also get a good grade on the First Byte Time.

Excellent, that is the best that you can hope for, good job on implementing everything. :)

Yeah congratulations. Alot of people don't take all the advice and just try to half-ass it. Or they want a magic bullet. The magic bullet is work.

Look at how your total bandwidth usage per pageload went down from nearly 5mb to only just under 700kb.

EDIT: oops I had tested your main page before, not the forums. Here's what you have done for the main page:

http://www.webpagetest.org/result/140827_2J_2YS/

Still, that's half the bandwidth and the load time is cut in half.

You still need to fix item #24 for even better results:

http://www.webpagetest.org/jpeginfo/...nime-logos.jpg