you should probably read the article then, it's pretty clearly explained

I did and don’t understand why the title is “simulating particles on a smart TV” if that is not what it is doing.

Ok, maybe that was a little bit clickbaity, but the first sentence should clarify it:

> The challenge, simulate millions of particles in golang, multi-player enabled, cpu only, smart tv compatible.

Usually you wouldn't do that on the server, but if you want performance metrics, it's probably easier to measure on the server than on X clients?

"No client simulation allowed only server."

Seriously