Thanks to the help of forum members at http://www.arcadecontrols.com/ i've figured out what the cause of the performance delay was. It's the onboard VGA card.
This takes a part of processor time / memory sharing, leaving less available for MAME emulation. For that reason now the system uses a dedicated AGP VGA card 64MB.
The classic games run smooth now! thanks again, discussion can be followed here.
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