Hi,
I'm running Ubercart on a Mercury server and it appears that Ubercart requires session cookies even for anonymous users (see: https://wiki.fourkitchens.com/pages/viewpage.action?pageId=13828781).
The problem is, that sessions cookies prevent Varnish from caching those pages (see http://groups.drupal.org/node/66888) -- and on top of that, once the user hits an Ubercart page, all other non-Ubercart pages stop being served from Varnish cache as long as that session cookie is present and subsequently performance for those pages is going from ~ 200ms to ~ 1sec.
My question to the group is...is there any way to have Ubercart pages served from varnish cache and still maintain the functionality that the session cookies are required for (i assume shopping cart).
Any other recommendations for max performance with Ubercart pages?
Thanks,
Mike