How do I read utilisation in game?

Turn on the overlay in your GPU driver software or use an on-screen display. Watch it during actual gameplay, not a menu or a loading screen.

Every system has one — something must be the limit. It only matters when the limiting part is far cheaper to upgrade than the one sitting idle.

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Bottleneck Calculator

Check whether your CPU or your GPU is the limit at your resolution, using your own in-game utilisation figures.

How do I read utilisation in game?: Turn on the overlay in your GPU driver software or use an on-screen display. Watch it during actual gameplay, not a menu or a loading screen.
Is a bottleneck bad?: Every system has one — something must be the limit. It only matters when the limiting part is far cheaper to upgrade than the one sitting idle.