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Benchmarking shows that `filterN` function is about 55-65% faster than the `filter` function based on stream fusion (tested for unboxed vectors containing 10 thousand and 10 million elements). Below is an example benchmarking report from criterion:
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[](/trac/ghc/attachment/wiki/PrimBool/prim-bool-criterion.png) |
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[](/trac/ghc/attachment/wiki/PrimBool/prim-bool-criterion.png)
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