How bad is the performance of the Unity Standard shader?

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?

I don’t do mobile developing, but if you’re worried about it, why not just use the built-in mobile shaders?

Really, the only way to be sure is to test on your target hardware.

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