Yes but WebKit is not a browser per se, it's a rendering engine.
It's less resource-intensive than Chrome, but here we are talking orders of magnitude between Lightpanda and Chrome. If you are ~10x faster while using ~10x less RAM you are using ~100x less resources.
Careful, as you implement misssing features your RAM usage might grow too. Happened to many projects, lean at the beggining, get's just as slow when dealing with real world mesiness.
It's less resource-intensive than Chrome, but here we are talking orders of magnitude between Lightpanda and Chrome. If you are ~10x faster while using ~10x less RAM you are using ~100x less resources.