Fixed both, see below. To get decent framerate on dgVoodoo you have to calibrate the graphics each time, it seems.

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GP3 = on my graphics card in hardware mode it runs really slowly (500%+ when pressing O for occupancy) with many polygons missing/flickering on-and-off, the sort of issues shown here: http://www.grandprixgames.org/read.php?1,1069659

Software mode works fine though

p.s. I have to apply some compatibility mode (even just Win8) to make the game work on my PC, otherwise it's just black screen when starting, instead of video.

p.p.s. the game will load with the menu narrow and messed up colours, but there's a quick fix - just do a quick race and quit back to the menu!

GP3 2000 Season is worse though - just opens with a black screen. Nothing more. Despite using the same engine as GP3!