&gt; LLVM does seem to struggle to support dynamic languages like JS well. For example Unladen Swallow (Python) and Rubinius (Ruby) were both commercially-backed efforts to use LLVM and neither achieved much performance.<p>FTL has had no problems with performance of LLVM generated code as far as I&#x27;m aware: the problem has been the performance of the compilation itself, and as I understand it, that is the motivating factor here.