I have small program UULib which i use for checking some timing information. When I compile with ghc 7 and profiling information I get the timings which are more or less what I expect. If I however recompile without profiling tome consumed goes up by a factor of 20! 1) Am I misinterpreting the results? 2) If not, does this look familiar to anyone? 3) If so, whether should I look first to see what is going on here? Doaitse dyn-81-64:ProgramTests doaitse$ ghc --make UULib [1 of 2] Compiling ParseInputs ( ParseInputs.hs, ParseInputs.o ) [2 of 2] Compiling Main ( UULib.hs, UULib.o ) Linking UULib ... dyn-81-64:ProgramTests doaitse$ time ./UULib 138000 real 0m9.101s user 0m9.048s sys 0m0.038s dyn-81-64:ProgramTests doaitse$ ghc --make -prof -auto-all -rtsopts UULib [1 of 2] Compiling ParseInputs ( ParseInputs.hs, ParseInputs.o ) [2 of 2] Compiling Main ( UULib.hs, UULib.o ) Linking UULib ... dyn-81-64:ProgramTests doaitse$ time ./UULib 138000 real 0m0.418s user 0m0.376s sys 0m0.038s dyn-81-64:ProgramTests doaitse$ time ./UULib +RTS -h -p 138000 real 0m0.457s user 0m0.397s sys 0m0.034s