My multi-site installation currently points to domain.com, but I need it to point to http://www.domain.com to use Google PageSpeed service properly. I am sure this is what I need to do. However, while it is trivial to change the siteurl of a single-site wordpress installation, multi-site seems very complicated, and I think that a lot of the ordinary steps given for multi-site installations aren't necessary for me, as I am merely moving it from domain.com to http://www.domain.com.
Does anybody know what I need to do? I am so close to speeding my site up by a factor of 3, but this has given me no end of trouble.