Developer Matt Birchler observed thermal throttling in the Apple iPhone 18 Pro during benchmarking. The A20 Pro processor initially achieved 447.9 words per second in a transcription test but settled to around 320 words per second after prolonged runs. This performance reduction is a common mechanism in portable devices to prevent overheating and component damage.
To address the thermal throttling, Birchler placed a cold can of La Croix sparkling water on the back of the iPhone 18 Pro during a 20-run benchmarking session. This method was based on his prior experience that cold beverages can quickly cool down phones.
With the external cooling, the iPhone 18 Pro achieved an average sustained performance of 400.4 words per second, despite a slightly lower initial peak of 429.5 words per second. This represents approximately a 25% increase in sustained performance compared to the uncooled runs. The test indicates that even a simple cooling solution can significantly impact performance under heavy, continuous workloads.
While most users may not require such cooling for daily tasks, those who engage in extensive activities like mobile gaming, video editing, or prolonged photo capture might experience performance benefits from mitigating thermal throttling. Specialized gaming phones sometimes include integrated liquid cooling, but this test shows an accessible, albeit unconventional, method for other devices.
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A tech enthusiast used a cold can of La Croix sparkling water to cool an iPhone 18 Pro during benchmarking, resulting in a 25% improvement in sustained performance. This demonstrates how external cooling can mitigate thermal throttling in mobile devices under heavy loads. The test shows that even simple methods can impact device performance during prolonged use.