Google Page Speed benchmark

A benchmark of some themes css with Google Page Speed (http://code.google.com/intl/fr/speed/page-speed/docs/rendering.html#UseE...):

gingko
13 very inefficient rules
15 inefficient rules
0 potentially inefficient uses of :hover
114 total rules.

foundation
13 very inefficient rules
18 inefficient rules
0 potentially inefficient uses of :hover
241 total rules.

chameleon
13 very inefficient rules
31 inefficient rules
0 potentially inefficient uses of :hover
221 total rules.

basic
18 very inefficient rules
23 inefficient rules
1 potentially inefficient uses of :hover
236 total rules.

clean
23 very inefficient rules
26 inefficient rules
0 potentially inefficient uses of :hover
274 total rules.

zen
18 very inefficient rules
39 inefficient rules
1 potentially inefficient uses of :hover
415 total rules.

Would it be worth reducing (or supressing) inefficient rules in Zen?

Vianney Stroebel
Likwid - Spécialistes Drupal - Paris