GHC-6.4.1 much slower than GHC-6.4

[Christian Maeder]

Mirko Rahn wrote:
> I was surprised about really big differences in running times between 
> 6.4 and 6.4.1, whereby 6.4.1 is *much* slower:
> 
> *** 6.4: cpu-time interesting (3,3): 00:01:38.08
> *** 6.4.1: cpu-time interesting (3,3): 00:05:58.91 

indeed, I had similar results. You may try to find out via profiling the 
cause for this difference.

Christian