I have an application, where the start-up time of the processor after power-on has to be as short as possible. With internal clock of 16MHz it should be around 200µs, regarding data sheet. But I see a start-up time of 4ms @16MHz and 3,3ms @20MHz. And there is no code that is responsive for the delay. For testing, the first command is a digital output, where I can see the delay after power-up.
VCC is 3V, working frequency is 4MHz (16/4) and the Fuses are as follows: