DB_DataObject performance

Hi, I've had successful experiences using DB_DataObject on corporate intranets, with a few dozens of users. But I'm currently working on a website which may soon receive about 30000 hits a day (latest evaluation). Have any of you already used DB_DataObject on high traffic websites ? Is there any serious CPU and Memory usage benchmarks out there ? Here's the implementation choice I'm facing : - either use DB_DataObject which relies on DB, DB_Result, etc... - or code my own dataobjects which simply encapsulate mysql_* calls Wether I choose the first or second option, I'll stick with the "dataobject design pattern" as a way to encapsulate the sql code and other smart behaviours. -- og