Jan from ArangoDB here:

Did you read the appendix?

"We used a TCP/IP connection pool of up to 25 connections, whenever the driver permitted this. All drivers seem to support this connection pooling, except Neo4j. We sent instead twenty-five requests via NodeJS to Neo4j."

Just to avoid unfair conditions now, if connection pooling is possible with the neojs driver, then you would have to configure the benchmark scripts to not send 25 requests via Node as well.

We tricked ourselves with such stuff when preparing the benchmark.