Ok, I learned something about SSL that should prevent most people from HTTP-ESSING their whole website:
While in SSL images are NOT CACHED. This means that any SSL page is downloaded in all its entirety even if it was dowloaded just recently. There is no cache with SSL and website will be slower and bandwidth wasted.
EDIT: Well, it seems that caching under https is different under every browser and even version of a browser, not just a make… Any way, you can try to force some files to be cached with this in htaccess but as per browser your mileage might very:
Header unset Last-Modified
Header set Expires “Fri, 15 Apr 2011 20:00:00 GMT”
I have been running our live site with this modification since 5/3 to fully test and it truly seems like an excellent option! Not a single problem or customer comment, store has been very busy throughout this month to date.