I think this is the COFF document which they say &quot;is directly applicable&quot;. <a href="https:&#x2F;&#x2F;github.com&#x2F;llvm-mirror&#x2F;lld&#x2F;blob&#x2F;master&#x2F;COFF&#x2F;README.md" rel="nofollow">https:&#x2F;&#x2F;github.com&#x2F;llvm-mirror&#x2F;lld&#x2F;blob&#x2F;master&#x2F;COFF&#x2F;README.m...</a><p>I&#x27;m guessing the speed difference comes from this linker using a different approach to symbol resolution which requires visiting files fewer times, but I&#x27;m not sure.