ORIGINAL: eniced73
You may want to check this on your maps. Just thinking that my units may be able to spot an enemy unit but i would never know unless I pan forward a bit to see what enemy icons pop up. Not sure of the impact on the frames though. I will try increasing it tonight as you state above if possible. I know the frame rate I get right now on this scenario is not that good. So I am assuming that if I increase this it will probably get worse.
Changing this could affect play balance in a scenario. A map maker might have set this to reflect the existance of fog or rain or snow and use this to limit the LOS. Increasing it might affect frame rate.
As far as sighting enemy units, but not realizing it, checking the mini-map is one way to monitor this. If you see enemy unit blip appear on the minimpat you can then pan to that area of the map.
You might check to see if weather affects are turned on or off and try toggling that, that setting only affects the appearance not the gameplay. That might improve your framerate.
Thanks
Rick