isSpace is too slow

Hi, I'm running a particular benchmark which calls isSpace a lot (basically wc -w). There are three ways to do the underlying space comparison - using the Haskell Data.Char.isSpace, using the C isspace, or using the C iswspace: isspace: 0.375 iswspace: 0.400 Char.isSpace: 0.672 Any chance someone could speed this up? Perhaps just replacing isSpace with a direct call to iswspace? On the particular benchmark I'm doing, C is 4 times faster than GHC - if isSpace was improved this would only be twice as slow. Thanks Neil