Checking out (speeding up the site)
Only for SubSkins 0.1 to 0.35, not needed for > 0.4
1) SubSkins has its own page-template that loads the css-files.
2) This is making the site slower than it has to
3) Customize the main-template and remove the lines
<tal:subskins tal:condition="exists:here/SubskinsMacro/macros/ImportStylesheets">
<metal:block use-macro="here/SubskinsMacro/macros/ImportStylesheets" />
</tal:subskins>
4) Add the css-files you have selected in the control panel to /portal_css, like this:

Of course, replace SubSkins_navigation.css with the file you have choosen.
You will have to do this for all the files you selected in SubSkins settings.