The benchmarks game URL was posted by someone who has put a lot of energy into promoting Haskell - dons makes the best of the opportunity that the benchmarks game provides to promote Haskell.

>>pervasive laziness... requiring a lot of space/time complexity for other algorithms<<

And GHC provides strictness analysis and explicit strictness to avoid reducing performance.

http://www.haskell.org/haskellwiki/Performance/Strictness