appears a couple of sites i've read have varying choices on how this really is used. case an over-all "how do you take advantage from itInch type question.
this can be a very "for idiot's" type of question, so any pointers are greatly appreciated.
the origin of the information was using YSlow to evaluate site load time.
mod_default is really a burden around the server's cpu. Save your valuable produced content into gzipped files after which obtain mod_rewrite. I actually do the like home page.
There is an excellent tutorial regarding how to do this, however it appears it's been erased. Google cache continues to have it, though.
Take a look. Maybe it will fit you.