On 12-10-2022 19:19, Damien Mattei wrote: > 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!? > > [...] > > 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)) The definition of 'function-unify-minterms-list' and 'minterms-set' is missing. Without a test case, we can only speculate what's going on. (E.g., maybe it grabs a mutex). Greetings, Maxime.