Server game with Nodejs or Python?

I'm using Nodejs for my server. My server just listen anh send data to client (website same like agar.io). My problem: because nodejs just use 1 core of CPU, so process time on server too long. Now, I want to rebuild it by Python. I need some solution for this. Have Python use all CPU's core? P/s: I tried use Nodejs Cluster for my code, but it not working

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