>>319229125
You should not use a normal mapped shader without a normal map. It's double the draw calls for absolutely zero reason. 
Honestly, if vrchat could somehow automatically replace every standard shader that is obviously only set up with a single texture with something like lit diffuse, performance would go way the fuck up across the board generally even on fallback shaders. 
It's why it sometimes felt "faster" back when everyone was using noe or cubed - simple shaders, no extra draw calls.