This is an age-old PC problem.
1) Turn off v-sync in your display properties
2) If this doesn't help then look for an option like "render frames ahead" and make sure that is set to 0
3) Turn off Anti-Aliasing in your graphics card options and failing that, in the game
and everyone remember the above to combat the dreaded "cursor lag".
edit: I remember that vegetation detail can have an effect on this too.
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