I am making a game intended for VERY low-end systems (low-end PCs up to 10-15 years old, mobile devices, WebGL) and I am optimising graphics performance as much as possible. The game is meant to be deployed in an educational environment, so good performance on all systems is critical.
How poorly does the Unity Standard shader perform on such old and/or limited hardware and software platforms, and what else can I do to optimise my graphics for these systems?