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Random note: GHC 7.10's build system actually disabled DPH (half a dozen more packages and probably a hundred extra modules), yet things \*still\* got slower over time!
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## Performance-related tickets
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Relevant tickets
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## Relevant tickets
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- [\#2346](https://gitlab.haskell.org//ghc/ghc/issues/2346): desugaring let-bindings
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- [\#7428](https://gitlab.haskell.org//ghc/ghc/issues/7428): Non-linear compile time: addFingerprint??
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- [\#10370](https://gitlab.haskell.org//ghc/ghc/issues/10370): OpenGLRaw
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- [\#8095](https://gitlab.haskell.org//ghc/ghc/issues/8095): TypeFamilies painfully slow
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[ https://ghc.haskell.org/trac/ghc/query?status=!closed&failure=Runtime+performance+bug&type=bug](https://ghc.haskell.org/trac/ghc/query?status=!closed&failure=Runtime+performance+bug&type=bug)
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## Compile time
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- [\#9557](https://gitlab.haskell.org//ghc/ghc/issues/9557): Deriving instances is slow
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- [\#8731](https://gitlab.haskell.org//ghc/ghc/issues/8731): long compilation time for module with large data type and partial record selectors
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- [\#7258](https://gitlab.haskell.org//ghc/ghc/issues/7258): Compiling DynFlags is jolly slow
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