The Optoma S310 has a maximum resolution of SVGA (800x600). That's 77% less resolution than the most common projector native resolution of 1080p (1920x1080).
This projector's resolution (SVGA (800x600)) is actually the worst resolution across all multimedia projectors of this spec and age.
The best resolution across comparable types of projector is 1080p (1920x1080).
What does "projector native resolution" mean?