I think Jevon's paradox is also hitting to some extent, coupled with the ecosystem getting bigger, so a typical project may have more transitive dependencies behind it. The functionality is going up, and the speed of compilation is going up, but the total latency is staying similar or increasing, in my experience.

that's definitely possible. I'm somewhat hopeful that some changes in 1.9 will let us cut back on transitive dependencies a lot, but it will take a few months to know for sure.

My concern for TTFX is the case when X is something infrequent but sensitive to latency? This a ridiculous example but when it is time for the anti-collision feature on my car to kick in, I want it to run, not compile. I think the right answer is to run a bunch of tests to get all the paths compiled and then build a new system image. But I haven't found a ton of guidance on how to do that. Seems like a perfect pipeline task.

That’s the idea. Here’s an example: https://discourse.julialang.org/t/a-julia-dataanalysis-sysim...