[Haskell-cafe] haskell build phase is very slow

Hi Cafe, I came from the C/C++ world, recently I play with a haskell editor named yi-editor, I find haskell build phase is very slow: 1.Compile one .hs file is slow 2. When change a little, it will recompile many many files Compare to c, compile a c source file seems much quick then compile a haskell source file. And if i change a .c file, it only recompile the file i changed, and relink, it's awesome. How can i make my build phase more quick? Thanks!