length of module name affecting performance??

Hi While trying to see if I could make some code run faster I stumbled upon something that looks weird to me: 2x-3x performance loss when a module is renamed to a longer name! Here's what I see with the attached examples: #diff long-modname-ver.hs short-modname-ver.hs 2c2 < import VeryLongModuleName ---

import ShortM

#diff VeryLongModuleName.hs ShortM.hs 1c1 < module VeryLongModuleName ---

module ShortM

#ghc --make -O2 -Wall long-modname-ver.hs #ghc --make -O2 -Wall short-modname-ver.hs #time -p ./long-modname-ver > /dev/null real 55.90 user 55.17 sys 0.51 #time -p ./short-modname-ver > /dev/null real 22.23 user 21.97 sys 0.10 I'm using GHC 6.10.1 on OS X. Any ideas on what may be going on? Thanks Daniel