![Rasppi-config](https://misapuntesde.com/images/2019/10/raspi-config.png)
I read it in an update of my favorite distro *DietPi* and didn't know this option.
If you add to */boot/config.txt* the next option:
initial_turbo=20
will force the *CPU* to a higher frequency at startup **for a few seconds** to improve the time it takes to boot. It can be set at *dietpi-config > Performance Options > ARM Initial Turbo* if you prefer.
I advise you to read the following link, especially if you use some kind of *overclock*.