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Which release profile settings change speed, size and compile time: lto, codegen-units, opt-level, panic abort, strip and debug. A table of effects, a recommended starting point and how to measure.
Profiles are named sets of compiler settings. Learn dev, release, test and bench, the keys that matter, per-package overrides and how to define a custom profile that inherits from release.
codegen-units splits a crate into parallel pieces and opt-level picks how hard LLVM works. See the defaults, the trade-offs and the settings for speed or size.
cargo build is slow to run and fast to compile, cargo build --release is the reverse. See what each profile changes, how to measure the gap and how to tune the dev profile.