Why Haskell is so slow

In languages that use lazy evaluation by default (like Haskell), all functions are effectively "short-circuit", and special short-circuit operators are unnecessary.

Short-circuiting can lead to errors in branch prediction on modern processors, and dramatically reduce performance (a notable example is highly optimized ray with axis aligned box intersection code in raytracing). Some compilers can detect such cases and emit faster code, but it is not always possible due to possible violations of the C standard. Highly optimized code should use other ways for doing this (like manual usage of assembly code).[citation needed]

http://en.wikipedia.org/wiki/Short_circuit_evaluation

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Orbis terrarum delenda est

What we need is Haskell stack machine.