[bd]

Maybe. I didn't get yet to play with specular term, current one is just vanilla Phong.

There should be still some performance margin left, I tried to tune it to keep 60 fps on my notebook.

[bd]

And it's done, if you clear cache and reload, it should be using physically based specular term.

Visual difference is quite subtle - skin feels more "silky" and ears are more shiny.

No noticeable degradation of performance.