I enhanced the performance of the game, by realizing that in the ‘default’ visualization mode, there was an optimality problem: in short, the program was recalculating the rotation-matrix to achieve the non-perfectly-top-down view, for each triangle, which is an overwork as at each 3D scenario of triangles being displayed, the point of view is the same (obvious), and so also that rotation-matrix is the same. I corrected it, and now the program should be MUCH MORE lightweight.
Remember that if it’s slow, download the game and run it on the Chromium we-browser, or anything that be faster than Firefox (that’s not really good for this program… it runs very slowly on it ).

Enjoy!