I attended last week the expert tutorial during the FreeFem Days. As far as I understood, Pierre Jolivet explained that mesh can be saved under a binary format if the following line is put in a script:
savemesh(Th, myFile.meshb);
When I do so, FreeFem creates two formatted files : myFile.meshb and myFile.meshb.gmsh. Is there a specific include or load to add in order to actually save the under a binary format.