Which isn't to say that the compiler itself (not counting incremental compilation here) isn't getting faster, but the improvements are gradual rather than the dramatic numbers seen in the OP. We have a website for tracking general compiler perf on a few representative programs: http://perf.rust-lang.org/ . In the benchmarks there it looks like we've shaved off about half a second from the compilation time on most benchmarks since March, though some have improved by multiple seconds and others have remained the same. In the long-term, we're looking at improvements to typechecking (via Chalk: http://smallcultfollowing.com/babysteps/blog/2017/01/26/lowe... ), improvements to linking (via LLD), improvements to debug codegen (via Cretonne: https://internals.rust-lang.org/t/possible-alternative-compi... ), and of course incremental recompilation.