

Difference of boat speed between real boats and VR boats

Hi
my boat is at the moment JUST in BETWEEN Boris Hermannn and R. Attanasio
The wind angle 68degrees and speed is the same -12kts for them and me both on VR and on VG official cartograpie page
my course is very near to their
however they make 20kts boat speed mine is only 13
I may not be an accomplished sailor like they are :)))) but why is this difference in boat speed??
Thanks


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