 Base on the estimation of YSlow:

You can see that Big Easy (Yootheme), Enigma (Rockettheme) and Tiris (JoomlArt) gets the highest core with C. On the other hand, others are D.

 Overview:

The one which has most total components is Big Eas (Yootheme) with 497 components, but it is not the heaviest, it is Tiris (JoomlArt) 2476.8K.

Aventure (JoomlaXTC) has least total components, just 53 componenst and iDesign (JoomlaXTC) is the lightest one, about 1151.8K. Tiris (JoomlArt) has 48 CSS components and Big Easy (Yootheme) has 3.

The size of CSS of Tiris (JoomlArt) is the biggest one: 613.5K, and the least is Aventure (JoomlaXTC) – 109.3K.

Besides, Aventure (JoomlaXTC) has the smallest size of JS with 114.7K and is the biggest one in this field is Tiris (JoomlArt) with 1649.1K. About the JS components: the most is Compassion (Shape5) with 26 components and the least is Enigma (Rockttheme) with just 5 components .

 About the CSS Image

Big Easy (Yootheme) has the most components: 458 components and is the heaviest with 3723.8K, while Game Magazine (Gavick) is the least with 17 components and YouAtect (YouJoomla) is the lightest with 69.3K.

 How about networking?

The fastest template is Big Easy (Yootheme) and inverse, the slowest is iDesign (JoomlaXTC) and Enigma (Rockettheme).

 Check The W3C

Check automatically, just 5 templates passed: Big Easy (Yootheme) and Compassion (Shape5) with 1 warning, Enigma (JRockettheme), Tiris (JoomlArt) and YouAtect (YouJoomla). There is no template can pass the XTML 1.0

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