I believe it pertains to the LOD system. 0 is off and 1 is on. Its exact function eludes me. but it may shut off a flag to let the engine know whether to use LOD or not, easing the performance
If you want to disable the LOD completely then just rem or remove those statements.
Intel(R) Core(TM)2 Quad CPU Q6600 @ 2.40GHz, 2400 Mhz, 4 Core(s), 4 Logical Processor(s), 8gb RAM, Nvidia gtx660, Windows 7 Pro 64bit, Screen resolution 1680 x 1050.
