ImageMagick 6.3.5 compile flags big performance drop

Hello list,

Im running debian and until recently I used their ImageMagick package  
with version 6.2.4.

Using this package I converted a 8 MB psd file to png in 3 seconds.

Now I downloaded and compiled the latest source 6.3.5 code.

Using the same convert command on the same file takes 17 seconds(!)

Has anyone the slightest idea what could be wrong and what configure  
flags that could have this much impact.

The systems is a Intel P4 2.8GHz, with 1GB ram running debian etch.

Thanks,
Henrik