Is it possible to achieve per-vertex lighting? and if so, will it increase performance?

I am working on a fast strategy-based shooter that feels a bit retro and runs on any computer, so I did a bit of research and learned of per-vertex lighting, which is used in some older games.
I could not find anything in the tutorials and forum, so any help is appreciated.

we don’t support vertex lighting, all is done per pixel. But to be honest, unless you need many lights, running with just the main sun light per pixel and no other lights will run just fine on vas majority of devices with webgl support.

thanks! my game runs on a single light source per scene, so It will work fine. Thank you!