 Base on the estimation of YSlow, you can see that Treamline (Yootheme), Radiance (Rockettheme) and Blaze (JoomlArt) gets the highest core with C. On the other hand, others are D.

 The one which has most total components is Treamline (Yootheme) with 490 components, but it is not the heaviest, the heaviest is Agency (Joomla XTC): 2960.3K. MyFolio (Gavick) has least total components, just 63 componenst and Blaze (JoomlArt) is the lightest one, about 920.5K

 All the components of CSS of these pages are from 3 to 20 components. Maxed Mag (Shape5) has 20 components and Treamline (Yootheme) has 3. The size of CSS of Treamline (Yootheme) is the biggest one: 298.1K, and the least is Youyork (YouJoomla) – 99.9K. Besides, Youyork (YouJoomla) has least components of JS and is the lighest one in this field with: 6 components and 122.1K. Once again, Maxed Mag (Shape5) has the most conponents of JS: 23 components. But the largest is MyFolio (Gavick) with 591.9K of JS.

 About the CSS Image: Treamline (Yootheme) has the most components: 464 components and is the heaviest with 3702.3K, while MyFolio (Gavick) is the least with 11 components and 52.1K

 How about networking? The template which loads fastest is . MyFolio (Gavick) and inverse, the slowest is Agency (Joomla XTC)

 Check The W3C automatically, just 3 templates passed: Treamline (Yootheme) with 1 warning, Blaze (JoomlArt) and Youyork (YouJoomla). There is no template can pass the XTML 1.0 Strict test. But all the templates support J1.7, just follow the trend of using and has K2 as 3rd party.

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