Firebird SuperClassic – Another option
Called SuperClassic, it will be the basis for the multi-processor support that we’ll see in Firebird 3.0.
Don’t lose count. Starting from Firebird 2.5 you will be able to choose among SuperServer, ClassicServer and SuperClassic.
Basically SuperClassic is like ClassicServer. Only instead of a process for each attachment it uses a single process with a thread for each attachment. The benefit being that it uses fewer kernel resources and is a bit faster.
Read a deeper comparison between the three architectures.