#14052: Significant GHCi speed regression with :module and `let` in GHC 8.2.1 -------------------------------------+------------------------------------- Reporter: RyanGlScott | Owner: (none) Type: bug | Status: new Priority: high | Milestone: 8.4.1 Component: GHCi | Version: 8.2.1-rc2 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: | -------------------------------------+------------------------------------- Comment (by RyanGlScott): To make things worse, this script takes even longer between GHC 8.2.1 and HEAD. As noted above, on 8.2.1 it takes about 35 seconds, but on GHC HEAD (as of commit d08b9ccdf2812e8f8fa34d0c89275deee574524c), it takes about 2 minutes 32 seconds. I still need to investigate to which commit(s) were responsible for this further regression. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14052#comment:4 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler