Overclocking the Raspberry Pi can improve the performance, but we risk greatly reducing the life of the hardware and will certainly void any warranties we may have through our kit provider. Given that the Raspberry Pi 3 is a much more powerful platform with a 1 GHz+ quad-core processor, there is likely little reason to overclock our Raspberry Pi 3 for use in penetration testing. If we find we need more processing horsepower, we are in most cases better off using higher-powered platforms for the workload and leveraging the Raspberry Pi 3 for remote sensing and collection. Either way, we should be fully aware of this risk before proceeding.
Note that the Raspberry Pi 3 still is not officially supported for overclocking, third-party tools and procedures (search engines can be a huge help here) such as those provided at http://www.jackenhack.com/raspberry-pi-3-overclocking/ will be needed to run at higher clock speeds.