If you pour water out of a bottle, what limits the water flow is how thin the neck of the bottle is. That’s where the name comes from.
In your case, it’s referring to which part of your system is limiting the overall performance. The GPU could in theory do more processing, but it’s waiting for the CPU to do its thing. So the CPU is the bottleneck: the part of the system that’s working at full capacity and the part that all the other components are waiting for.
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