 Base on the estimation of YSlow:

You can see that Catalyst and Visage get the highest core with C.
On the other hand, the others are D
Catalyst and Visage reach the better YSlow standard than the others.

 Overview:

The most total components: Catalyst - 519 components
The least total components: BusinessClass - 74 components
The biggest total size: Kranos - 7607.3K
The smallest total size: Business Class - 1275.1K
Conclusion: The Business Class – Template of JoomlaXTC is the lightest template in December 2011

 About the CSS Image

• The biggest size of CSS image belongs to Catalyst with 484 components and 4722.1K
• Music template has least components of CSS image: 16 components
• Kranos template has the smallest size of CSS image: 79.8K

 How about networking?

• The fastest template is Catalyst
• The slowest template is Visage

 Check The W3C:

 Check automatically, just 4 templates passed:

• Catalyst (passed with 1 warning)
• Visage
• Kranos
• YouPlus

 Check XHTML 1.0 Strict , there are no template can pass.

Download our attachment HERE to know more