Subject FB embedded slow in Windows 64bit?

Hi all,

an older Delphi 7 project using Firebird 2.1 embedded  and is working fine under XP or Win 7 32bit, but very slow under Win7 64bit or Windows 8 (as a customer reported).

I switched to Firebird 2.5.5. but got the same slow results. 

Has anyone made similar experiences and, if, is there a solution?

With best regards,