Is there something that changed in 7.4.1 that would cause it to decide to interpret .hs files instead of loading their .o files? E.g.: % ghc -c T.hs % ghci GHCi, version 7.4.1: http://www.haskell.org/ghc/ :? for help Loading package ghc-prim ... linking ... done. Loading package integer-gmp ... linking ... done. Loading package base ... linking ... done. Loading package filepath-1.3.0.0 ... linking ... done. Prelude> :l T [1 of 1] Compiling T ( T.hs, interpreted ) Ok, modules loaded: T. *T> Versus how this works with 7.0.3: % ghc-7.0.3 -c T.hs % ghci-7.0.3 GHCi, version 7.0.3: http://www.haskell.org/ghc/ :? for help Loading package ghc-prim ... linking ... done. Loading package integer-gmp ... linking ... done. Loading package base ... linking ... done. Loading package ffi-1.0 ... linking ... done. Loading package filepath-1.2.0.0 ... linking ... done. Prelude> :l T Ok, modules loaded: T. Prelude T> It makes a big difference when ghci decides to go interpret 100 files vs just sucking in the .o files. This is OS X, 10.6.8. Anyone else see this?