We have a Joomla site (http://guru99.com) running over dedicated server. Currently, Rockettheme's gantry based template is installed on the site. So, to optimize my site's performance I have tested various templates of different frameworks with same content on my homepage and then I checked its Loadtime, Pagesize and No of requests using http://webpagetest.org I found following difference in them with respect to my current template's parameters
Template Framework : Loadtime(Sec) / Pagesize(Kb) / No of Requests
Warp : 0.792 / 130 / 14
T3 : 0.708 / 61 / 19
Helix : 0.225 / 106 / 24
I have tested all these frameworks with their basic free themes, So Now my Question is "am I getting a big difference in them with respect to my current template", and do I need to look for different template for increased performance considering these differences?