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Valve shipped three updates in August, and the last one fixed a speed calculation bug that let players move faster than intended by hugging walls in long corridors.
Valve quietly stopped letting grenades pass through level geometry. Every lineup you copied off YouTube two years ago needs a re-check.
Valve only publishes a minimum spec for CS2, which is why the buying advice around it is such a mess. Here is the short list of options worth changing and the hardware order that follows from it.
Valve rebuilt the engine and the shooting still feels correct. What it did not fix is who you end up playing against.