This is a tangent, but having worked with digital circuits for 40 years, the improvements in chips have made circuit construction -- even breadboarding -- vastly more forgiving than ever before. I've run 10 MHz clocks on breadboards and 100 MHz SPI bus on 2 layer boards that were not designed with extreme care. And, it's a fast precision ADC that's meeting its datasheet specs on that board.
No doubt the parasitics and other nasties still come into play, but it's still amazing how much faster we can go before they start to bite.
No doubt the parasitics and other nasties still come into play, but it's still amazing how much faster we can go before they start to bite.