A bottleneck is something causing a slowdown in a series of events.
Think of the shape of the neck of a wine bottle. It’s much thinner than the bottom of the bottle, so it doesn’t pour out too fast. If the top of the bottle was the same diameter of the bottom, it would spill all over when poured. The bottle neck causes the slow down.
In this case your CPU is causing the slowdown, affecting performance. The CPU is the control center of your computer, needed to run applications.
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