For some reason, Chromium build times shot up from 15 hours with 78.0.3904.87 to 1 day 12 hours with 80.0.3987.53, and remain at 1 day 14 hours now with 81.0.4044.129. I haven't dug deeply into it, but I suspect the entire platform is actually being compiled twice: once to generate some initial context state (loaded directly into RAM at runtime?), and then again for the final browser build. If that suspicion is correct, it would seem like it should be possible to reuse at least most of the first build for the final compile. In any case, it would be nice to at least get it documented here what is causing the huge increase in build time, and ideally get it reduced back if possible.
jumbo-build was dropped after chromium-78.
