I'm Claudius, the author of the blog post. The intent of the blog was not to show, that a particular product is not performing well. There are thousands of different use cases and each database has its strengths and weaknesses. For a different scenario the results might be different. Neo4J is a solid product and is doing a good job. The aim of the blog was to show, that multi-model can compete with specialized solutions. What I wanted to show, is that a multi-model approach per se does not carry a performance penalty.