Whether it is better to keep your laptop lid open or closed depends on how you utilize the machine and whether you connect external peripherals. Keeping the laptop lid open during active use is generally better because it ensures optimal thermal dissipation, allowing built-in fans and keyboard decks to exhaust internal heat away from the processor and battery, which prevents thermal throttling. Furthermore, keeping the lid open allows you to utilize the built-in webcam, microphone, and primary display screen. Conversely, keeping the lid closed is ideal when connecting the laptop to an external monitor, keyboard, and mouse in "clamshell mode," provided your desk setup has adequate ventilation. You can verify thermal health by monitoring CPU temperatures during heavy tasks.
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