Yes we’d love help with investigating, characterising, and fixing performance bugs.

Simon

From: Haskell-Cafe [mailto:haskell-cafe-bounces@haskell.org] On Behalf Of Thomas Miedema
Sent: 07 January 2016 00:52
To: Johannes Waldmann <johannes.waldmann@htwk-leipzig.de>
Cc: Joachim Breitner <mail@joachim-breitner.de>; Haskell cafe <haskell-cafe@haskell.org>
Subject: Re: [Haskell-cafe] long-range performance comparisons (GHC over the years)

I recently noticed a performance problem 

...

What worries me is that such a regression
had been sitting there for over a year

There are 215 open runtime performance tickets (out of a total of 1655 open tickets, that makes 13%).

Compared to say new typesystem features, they don't get much attention. Only a few were fixed this year, most of them by Joachim Breitner (the new performance tsar?). He also created https://perf.haskell.org/ghc.

In case you want to help out, start here: https://ghc.haskell.org/trac/ghc/wiki/Newcomers.