input lag in games under guest OS Windows

Basically I have tested 3 Pinball games: the old Balls of Steel and the newer Pinball FX and Arcade Pinball via Steam

My Guest OS is Win 7 x86, 3GB RAM (of 8GB on host), 512MB Video, performance to VM.

All 3 games seem to work graphically smooth enough but there is a delay in the flippers that makes the games unplayable.

This issue -obviously related to render ahead settings that are good for video but better left off for games- seems to haunt non-virtual machines as well and knows a simple solution for Nvidia or AMD hardware users.

http://pinballarcadefans.com/showth...pper-delay-in-TPA-PC-version-please-read-this

Question is, how to translate this to a Parallels VM?

Thanks in advance for any useful suggestion.

EDIT: Would somebody be so kind to reply the mail address of Parallels Dekstop support? Seem the whole site is to scripted to allow me to get it from there.
Thanks again.