Fast : When  the sketch  contains many  profiles,  the fast mode  allows to generate operation  almost immediately.  This allows  for example to produce  easily a plate with  many holes  (one  sketch containing  over 1500  circles gives a result in  10 sec..  instead of  1 minute  in normal mode).

Check result : Using this mode, some verification steps are not performed. User can force this verification with this option.