It's a shame to have four cores on the server, and only use one of them.
Try classic.

> A customer has moved server from an XP machine to a a super-duper
> Win2003 PC and is experiencing big query slow downs.

> Details:

> Win2003 R2, two dual core Xeons, 4GB ram, database installed on a raid
> 5 disk array.

> Running FBv1.53 SS as a service+guardian.
> CPU Affinity=1.
> No virus checker running
> 1 database (.fdb ext) around 35MB in size.