OK, I'm now getting a constant 125fps. Thanks for your help. If anyone is interested here are my basic settings.
NVIDIA CONTROL PANEL SETTINGS
Anisotropic filtering Application-controlled
Antialiasing -gamma correction Off
Antialiasing - Mode Application controlled
Antialiasing - setting Application controlled
Antialiasing - Transparency Off
Maximum pre-rendered frames 4
Multi-display Single Display mode
Texture Filtering Anisotropic opt Off
Texture Filtering neg LOD bias Clamp
Texture filtering - quality Quality
Texture filtering - Trilinear Opt Off
Threaded Optimization Off
Triple buffering Off
Vertical sync Force Off (seems it must be turned off in Global settings also)
ARENA SETTINGS
Cl_maxfps 140
Sys_affinity 0
Shaders on
Dynamic lights on
screen res 1920 X 1200
texasriffy
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