not really, Haskell is slower than C++/Rust. You get faster performance by being mechanical sympathetic, i.e. you care about how to laid out your data in memor

not really, Haskell is slower than C++/Rust. You get faster performance by being mechanical sympathetic, i.e. you care about how to laid out your data in memory efficiently for the CPU to process, when and how much to allocate, which code path to fold together (inlining) to create a smallest possible set of instructions. JIT is theoretically possible to figure out all that and transform your code into optimized form, but practically? we don't have Sufficiently Smart Compiler[1] yet. Usually, JIT is worse in restructure your data layout than figure out which part to inline. [1] https://wiki.c2.com/?SufficientlySmartCompiler https://wiki.c2.com/?SufficientlySmartCompiler