Ran across 2004 post when I was working on a portable digital audio recorder, learning Assembly, trying to get more performance. Added GPIO triggers to visualize what/when parts of code ran on the analyzer.

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The picture depicts life over the last week, staring at logic analyzer timings and trying to shave microseconds.
Microseconds don't seem like much, but waste a hundred of them a few million times and by golly you are starting to talk seconds and minutes! Down in the land of nano seconds a microsecond looks truly opulent.
Which reminds me of a product idea. The Nano Shave Bot (NSB). The NSB spends its time parked next to a facial hair (perhaps stretched out on a lounge chair drinking Pico Coladas) and whenever that facial hair gets too tall the bot whips out a nano chain saw and chops it down. Alternately the Nano Shave Bot could power itself by eating whisker 24x7, with a hair over-reduction algorithm that prevents it from going sub-dermal.