There is always a long tail of optimizations and tweaks that must be done to get a language that last 5% of the way to parity with a language like C. Building o

There is always a long tail of optimizations and tweaks that must be done to get a language that last 5% of the way to parity with a language like C. Building on LLVM gets them 95% of the way. BTW Rust has some features that make optimization a lot easier, like the ability to assume strict aliasing in more cases. It’s safety features also make it easier to write zero copy, copy on write, and other optimization patterns without making mistakes. This enables some bold performance optimizations at the code level that would require serious bravery in C. Long term I expect that Rust will be faster in some cases.