Help on caching an object.

Hello gang, First of all, yes I searched the mailing list's archive. My problem is very simple: I have an object that's definately called with every page request. It's pretty much the same for every unregistered/anonymous user. And it's not small. Alot of attributes are being set from DB queries etc. Now my idea was to do some sort of caching with PHP to speed things up. So I was wondering if anybody had experiences on this ... Of course, I considered using serialize(), but it seemed to me as if it could cause even more lagging since PHP requires the class to unserialize the object correctly. Then I would end up reading the class file, reading the searialized object and unserializing it. A 100 simple DB queries might be done in the same time or at least not much slower. Could it be that I'm looking at the wrong place? Should it be more like caching the queries or something similar? Thank you very much for everyone's effort in advance.