-notexturestreaming launch option
Using the -notexturestreaming launch option should in theory cause only high quality textures to be loaded without streaming between lower quality ones as detailed here: http://udn.epicgames.com/Three/CommandLineArguments.html
Unfortunately it doesn’t work and makes all map textures completely black (except for player textures) and makes the ground invisible.
So in case you have a hard time distinguishing players from the environment or if there’s someone hiding under the ground… here’s the hack for you lol. :|