Since Minecraft 1.8 (or maybe earlier), I've been starting my home Minecraft Server with the GUI so that I can see which of my kids are connected. I start the server from a BASH terminal using:

java -Xmx1024M -Xms1024M -jar minecraft_server.jar

(Java SE version is 1.8.0_91)

When I upgraded to Minecraft Server 1.10, I noticed that the CPU usage was always high, even when no players are connected.

To compare, I tried running the exact same world using both the GUI and NOGUI and noting the CPU usage. Here are my results:

Minecraft Server 1.8.4

• nogui = hovers between 0.5% and 6% CPU
• with GUI = hovers between 49% and 80% CPU

Minecraft Server 1.9.4

• nogui = hovers between 0.8% and 8% CPU
• with GUI = hovers between 41% and 80% CPU

Minecraft Server 1.10.2

• nogui = hovers between 0.8% and 6% CPU
• with GUI = hovers between 48% and 95% CPU

Clearly the GUI is using far more CPU than the "nogui" option, but why? It's not exactly rendering any fancy graphics and there doesn't seem to be a reason for the simple GUI to need so much CPU compared to "nogui". Does showing the "Memory use" and the "Avg tick" really need so much CPU to be consumed?