I have a Python bot periodically talking with the internet that

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I have a Python bot periodically talking with the internet that I like to run in several configurations.

How come running it 10 times next to each other in PyCharm is much more stable than running it in 10 different terminals.
At least that's what I think I'm seeing. Does PyCharm somehow manage those threads?
I also have a shit PC and stuff freezes if there are too many calls from different bots at once, and worse if I watch youtube at the same time and so on.

Also, to reveal my full noob level, should I buy a better computer component or rather check if I can get a better internet connection.