I am using Yoast SEO plugin which comes very highly recommended. It suggests that keyword density should not be more than 2,5%. Harsh Agrawal from Shout me load recommends approx 1.5% and if you google the question his article is 1st or 2nd place. The also i have come across quite a number of articles suggesting that keyword density is not really an important metric for ranking in the serps. I surely hope I have not wasted all the effort of ensuring my posts are all keyword optimised. So to boil down to the bedrock of my question - What is the optimal keyword density?