what`s the problem for parallel downloads?

[TanzNa]

I've recently designed a new website..

I read most posts of these froums and other source to improve performance of my website.

result:
Main page: http://tanzna.ir
webpagetest: http://www.webpagetest.org/result/120320_TC_3N2HH/

an article page: http://tanzna.ir/social-satire/iran/4768...21643.html
webpagetest: http://www.webpagetest.org/result/120320_YN_3N2HN/

I think if I could have a parallel downloads.The Times was better

whats my problem? can some body give me some Advice
tnx

[doc_uk]

There's a lot of images on the home page. See if you can css sprite a few of them that are used thru the site. Also, try to set up subdomains so that you can host images from them for more parallel downloads