Have you checked how changing the optimization level affects build times?
Are you using template Haskell?
On Tuesday, September 29, 2015, aditya siram
Hi all, Since upgrading to 7.10.2 from 7.8.4 I'm seeing a significant increase in compilation time. I understand this is a known issue but since I'm seeing something like a 3x slowdown but not across the board, I thought I'd ask.
Compilation time for the library I'm writing has remained about the same. I am seeing the slowdown when compiling executables that use the library. There are no other dependencies except base so I'm guessing it something in my library causing the issue.
I lean heavily on the FFI, OverlappingInstances and HList style programming in my library which leads me to believe that one of these is causing it. I am seeing no difference in compilation speeds by adding the per instance OVERLAPPING pragmas.
Can anyone advise or instruct me on how to profile the compiler?
Thanks! -deech