Here is another modest fps friendly upgrade for a track that has never had a graphics upgrade as far AFAIK. I have a soft spot for Mark Beckman's track. Simple in design and wide enough to be marvels for fun racing,I'll always have 3 of them on hand. Kansas,USGP1960 and Diamante.
Cesari Ascari posted an update for Jamaica and IMO suits this track to a Tee. The Goods Guys at the GPL repository provided the billboards. I like Diamante and also think it is an under appreciated track. Maybe you will too. I hope you enjoy.
KWB 7 Feb 10