[GHC] #14414: Profiled program runs 2.5x faster than non-profiled

[GHC]

#14414: Profiled program runs 2.5x faster than non-profiled
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        Reporter:  Fuuzetsu          |                Owner:  (none)
            Type:  bug               |               Status:  infoneeded
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.2.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Runtime           |  Unknown/Multiple
  performance bug                    |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by osa1):

 I also can't reproduce this with GHC 8.4.2 on Linux. When I increase the
 input by 10x (otherwise it runs too fast on my system) and call `time` I
 get these numbers:

 - Profiled: 12.18s, `-s` reports: 12.17s
 - Non-profiled: 2.00s, `-s` reports: 1.9s

 Non-threaded runtime:

 - Profiled: 3.73s, `-s` reports: 3.72s
 - Non-profiled: 1.29s, `-s` reports: 1.28s

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14414#comment:13>
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