Hi all, In semi-private I have been making very bold claims about the unsuitability of the devel2 as a build flavour of choice for the aspiring developer. In order to bolster my claim I set out to find out some statistics about 1. devel2 flavour 2. default+no_profiled_libs+omit_pragmas+assertions flavour The difference between the two is essentially that flavour (2) builds each module with optimisation but disables cross-module optimisation (in particular inlining) In short the difference between the two flavours is negligible from my testing apart from one larger difference when building larger packages. Full build + test: Near identical Testsuite run: Near identical Recompile: Near identical - (2) is slower Build Cabal: 167s vs 259s So if you want to build packages use flavour 2 but otherwise it seems to make little difference. Cheers, Matt