Compiling is too slow

[ksqsf]

The preprocessing step takes at least 10 minutes on a fairly recent laptop. I'm not sure what's going on though... The actual 'autogen' part seems to be relatively quick:

(from here)
creating
/private/tmp/encoding-0.8.6/dist-newstyle/build/x86_64-osx/ghc-9.0.1/encoding-0.8.6/build/Data/Encoding
Data/Encoding/MacOSRoman.hs generated from mapping
Data/Encoding/MacOSRoman.mapping
creating
/private/tmp/encoding-0.8.6/dist-newstyle/build/x86_64-osx/ghc-9.0.1/encoding-0.8.6/build/Data/Encoding
Data/Encoding/JISX0201.hs generated from mapping
Data/Encoding/JISX0201.mapping
creating
/private/tmp/encoding-0.8.6/dist-newstyle/build/x86_64-osx/ghc-9.0.1/encoding-0.8.6/build/Data/Encoding
Data/Encoding/JISX0208.hs generated from mapping
Data/Encoding/JISX0208.mapping2
creating
/private/tmp/encoding-0.8.6/dist-newstyle/build/x86_64-osx/ghc-9.0.1/encoding-0.8.6/build/Data/Encoding
Data/Encoding/JISX0212.hs generated from mapping
Data/Encoding/JISX0212.mapping2

but it's stuck somewhere above for a really long time.

[ksqsf]

I guess a simple solution is to ship the autogenerated modules with other sources... (The mapping files themselves are not updated frequently, I guess?)

[Martinsos]

Indeed it is very slow! Could we somehow make it faster?