map-par slower than map

[Damien Mattei]

Hello,
all is in the title, i test on a approximately 30000 element list , i got
9s with map and 3min 30s with par-map on exactly the same piece of code!?

what i change in code is in comments:
{unified-minterms-set-1 <+ (map function-unify-minterms-list minterms-set)}
;;(par-map function-unify-minterms-list minterms-set)}

translated from Scheme+ to Scheme:
(define unified-minterms-set-1 (map function-unify-minterms-list
minterms-set)) ;;(par-map function-unify-minterms-list minterms-set))

best regards,

Damien