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When we first enabled ThinLTO on our builds, we got great performance gains, but also large size increases due to aggressive inlining. There is an LLVM option called -import-instr-limit that limits the size of functions that may be imported (the threshold is subject to modification by PGO). Chromium found a good balance between speed and performance by using a value of 10. In initial testing, on Windows and Linux that value can save us many megabytes from libxul without noticeable speed regressions. For Mac, which doesn't yet have PGO, we have to use a higher limit to avoid over-restricting the optimizer which caused slowdowns on my try pushes. Differential Revision: https://phabricator.services.mozilla.com/D51463 --HG-- extra : moz-landing-system : lando