I think firebird SS 2.0.4 not uses full hardware resources in SMP environment. It is in firebird foruns around the world.

How I make multiple instantes of Firebird in same server?
Can you help-me?

--- In firebird-support@yahoogroups.com, Douglas Tosi <douglasht@...> wrote:
>
> On Tue, Apr 14, 2009 at 1:09 PM, Marcelo Galdino Pereira
> <mgaldinonet@...> wrote:
> > We have problems with server performance.
> > Articles say the Classic Version of Firebird runs better than
> > superserver in this case. Is quit so?
>
> Yes, Classic is generally recommended for multi-core servers.
> BUT, it is a bit harder to configure and maintain.
> You may also run multiple instances of SuperServer, one for each database.
>
> Changing server architecture may not solve your performance issue and
> may bring other problems to the table.
> Ideally, the first thing you should do is identify what is going wrong.
>
> hth,
> --
> Douglas Tosi
> www.sinatica.com
>