[ut2003io] Performance under Linux

[Daniel Vogel]

> FYI, I did some benchmarking a few days ago between the UT2003 Linux and
> Windows ports. With all the talk about how the OpenGL version ought to
> be slower, I found the two ports to be neck-to-neck.

D3D/ OpenGL performance should be roughly equivalent on a correctly
configured system - the OpenGL renderer is a bit more picky on NVIDIA cards
though.

-- Daniel, Epic Games Inc.