Why would an overclock on a Pi 5 decrease performance in some areas?

The Raspberry Pi is a series of credit card-sized single-board computers developed in the United Kingdom by the Raspberry Pi Foundation to promote the teaching of basic computer science in schools and developing countries.

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Why would an overclock on a Pi 5 decrease performance in some areas?

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Nothing important here, but I'm very curious as to why overclocking a Pi 5's CPU to 2.8GHz and GPU to 900MHz would result in lower performance in some areas. The vast majority of the metrics were improved, but these were lower and caught me by surprise:
Area 2.4GHz/800MHz 2.8MHz/900MHz File Compression 87.4 MB/sec 84.7 MB/sec PDF Renderer 42.0 Mpixels/sec 41.2 Mpixels/sec Object Detection 22.3 images/sec 22.1 images/sec Photo Filter 9.82 images/sec 9.36 images/sec
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Source: https://www.reddit.com/r/raspberry_pi/c ... _decrease/
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