Is Vertex Lighting still computed if no lights are in the scene?

Quick question about vertex lighting in vertex lit shaders, or even surface shaders for that matter...

Let's say I only use lights to bake my Lightmaps, but in-game, all lights are turned off/deleted, will the shader still computer vertex lighting at runtime and be slower then a UNLIT shader?

I understand that if I have realtime lights in my scene at runtime, the lighting will be computed and the shader will be slower then an UNLIT shader, but if I don't have ANY lights in my scene at runtime, does this still hold true?

Thanks for your time! Stephane