LinuxCon: A tale of two bootcharts

I thought emacs switched at some point from actually dumping core to more explicitly byte-code compiling the elisp and writing it to files, on account of needing a substantial chunk of optional elisp from a very large library when starting up; dumping only the fundamental stuff was still too slow, and dumping everything would require reloading too much, so they needed a quick way to load individual modules, and this obsoleted the core dump mechanism. But I could be wrong; it's been ages since I've actually watched emacs build.