[Haskell-cafe] Very _very_ slow compiles on Windows 10

Is anybody else experiencing really slow compilations with GHC 7.10.2 on Windows 10? I use stack to compile the project and run it under a mingw64 environment provided by Github bash. The CPU usage is very low all the time (meaning: GHC does barely use the CPU). On same computer with Ubuntu 16.04 it just compiles normally, but under Windows it is for sure 10x slower, maybe even more. Nicu