How it works ? Inside Moi ? You import an OBJ file ?

Ok , I have found the method : Now 1 second on my computer! :)

But same time and result when adding a number! (little or big)
1685.156253 When importing an OBJ

With the normal file
1688,220446 in 2 seconds by default _Cvolume

1668, 250237 in 1 Second with _Cvolume 10

1561,334244 in 0 second with _Cvolume 100