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This is an attempt to fix an incompatibility that causes very low FPS in rFactor when using many NVIDIA cards (most common on the 8800 series). The problem is caused by the way that these cards allocate memory for vertex buffers. The long history of this problem and the solution in the following thread: http://forum.racesimcentral.com/showthread.php?t=294692

Quite a few people have been using this fix for a while, and it seems to produce between a 50% to 100% improvement in FPS, especially at the back of the grid. For unknown reasons, however, certain people are not affected by this problem and actually see reduced performance with this file. Your mileage may vary. Please also note that a few people with ATI cards have reported an improvement. Finally, this also appears to work in at least some other games based on ISI's engine, including GTR2.

Disclaimer:

There have been a few reports of lockups when using this fix. It is not clear whether the problem is related to the fix or is due to something else, but be aware that the possibility of lockups exists. I am very sorry if you experience any lockups with the fix, and please post a comment here if it happens to you.

Note:

This version works with the HDR plugin (the original one, not the modded one), but does NOT work with the TVStyle plugin at this time.

Installation:

Put the included d3d9.dll in your rFactor root folder.

If you want to use the HDR plugin, rename that plugin to d3d9_2.dll. As a result, in your rfactor folder you should have 2 files: d3d9.dll (my DLL), and d3d9_2.dll (the HDR plugin).

Uninstallation:

Delete the d3d9.dll file from your rFactor root folder. If you were using the HDR plugin, rename d3d9_2.dll to d3d9.dll.