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I have a multiplayer game. Two spheres just moving around on the screen, but when i move the game client to another "tag"(virtual screen) game just speeds up x3-x5. Everything is moving faster, coordinates are changing faster. What can cause this? If you need any code or more info i will provide.

Make sure to use dt with any math. It helps keep the physics framerate independent. Which may the issue here. If on one machine it has an high fps it could possibly cause the maths to be done more.