Hello,
I have been testing 5.3.beta7 version on Ubuntu 14.04

(I had crashes on this system with version 5.1 see https://sourceforge.net/p/sweethome3d/bugs/583/ )

* no crash so far (open file, modify, save, quit, reopen, make photo and vidéo)

* I confirm that virtual 3D visit is slower (with ...