[GHC] #12706: Collecting type info is slow

[GHC]

#12706: Collecting type info is slow
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        Reporter:  vshabanov         |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  GHCi              |              Version:  8.0.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by nomeata):

 >  Is it expected behavior and some performance improvements are planned
 or it's a bug?

 I would not be surprised to find that this is a rather rarely used feature
 and may not have gotten the necessary attention. But this might also mean
 that there is some low-hanging fruit. I would recommend building a
 profiled compiler and get a profile for this bit, just to see if there are
 obvious hotspots.

 vshabanov, are you interested in working on this, or just reporting it for
 now?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12706#comment:1>
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