> I'm extremely dissatisfied with the performance of current compilers. The fastest compilers written by performance-oriented programmers can be way faster than ones you generally encounter. See luajit and Jonathan Blow's 50k+ loc/second compilers and the kind of things they do for performance.

Lua and Jai are lot less complex than say C++: sure, LLVM isn't necessarily built to be the fastest compiler in existence, but I don't think it's fair to compare it to compilers for much simpler languages and bemoan its relative slowness.