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### Type pile-up
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Some programs can produce very deeply nested types of non-linear size. See Scrap your type applications? for a way to improve these bad cases
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Some programs can produce very deeply nested types of non-linear size. See [ Scrap your type applications](http://research.microsoft.com/en-us/um/people/simonpj/papers/variant-f/index.htm) for a way to improve these bad cases
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- [\#9198](https://gitlab.haskell.org//ghc/ghc/issues/9198): large performance regression in type checker speed in 7.8
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... | ... | @@ -250,6 +250,7 @@ While it's possible to fix (1) and (2), (3) is inherent. |
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- [\#10800](https://gitlab.haskell.org//ghc/ghc/issues/10800): vector-0.11 compile time increased substantially with 7.10.1
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- Regression in `vector` testsuite perhaps due to change in inlinings
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- [\#13639](https://gitlab.haskell.org//ghc/ghc/issues/13639): Skylighting package compilation is glacial
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## nofib results
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... | ... | @@ -282,7 +283,7 @@ While it's possible to fix (1) and (2), (3) is inherent. |
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(NB: Sporadically updated)
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**As of April 22nd**:
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**As of April 22nd, 2016**:
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- GHC HEAD: 14m9s (via 7.8.3) (because of Joachim's call-arity improvements)
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- GHC 7.10: 15m43s (via 7.8.3)
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