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Instead, attempt to extract the message that _would_ be displayed on execution of `./configure --help` by relying on some markers present in autoconf-generated configure files. As measured with 'hyperfine' on a laptop running in reduced frequency power savings mode, `fish -c "__fish_parse_configure ./configure"` runtime dropped from ~1.25s to ~0.8ms, which is inline with the previously observed ~350ms execution time for `./configure --help`. fish's own startup time is approximately 75ms before parsing begins. Still very slow, but much better.