High CPU usage on low request rate

Hey, I’m fairly new to Ghost but I’ve reached the state of setting everything up and going live. The final step was benchmarking the request it can handle. It didn’t take long to realize that the CPU usage (95%) of the /usr/bin/node current/index.js process was very high even at a low request rate of 10 per second. When the same benchmark was tested on one of my PHP projects with the same hardware and the same request rate, the CPU usage was only 10%, even though this PHP project loads and processes a lot of data. So I was wondering if this is normal or if there is a way to tweak Ghost/node.js.