[Zope] more info about BTree

Dear friends, Greetings! I just downloaded BTree and tried working with it as I was told btree could handle large no. of objects of similar structure with ease. I filled in 15,000 dtml methods and the zope almost stopped responding... May be my test server ( a pc running win 98, my-sql and zope on 64mb ram ) was not good enough. I want to know more about BTree. I searched zope site and got only 6 links to the subject was not good enough to understand BTree. Does anybody have any web links whith provide more info... Thanks in advance. Regards, - sree