Official haskell ide support via language server (LSP). Successor of ghcide & haskell-ide-engine.
Searching for "memory" among the open issues on haskell-language-server, yields quite a few results. From a quick glance, it seems to depend on the project, as specific projects seem to make the language server behave/leak quite bad.
UI integrations for lsp-mode
I think you should be customizing LSP-UI specifically for the grey text issue, but I haven't used it recently enough to remember: https://github.com/emacs-lsp/lsp-ui
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Learning Tidal Fundamentals - nice ground-up intro to TidalCycles by Mark Zadel
2 projects | reddit.com/r/haskell | 11 Jan 2022
haskell-language-server: Official haskell ide support via language server (LSP). Successor of ghcide & haskell-ide-engine.
1 project | reddit.com/r/planetemacs | 7 Dec 2021
Coming back to Haskell after a couple of years, what changes should I be aware of?
3 projects | reddit.com/r/haskell | 6 Dec 2021
Monthly Hask Anything (December 2021)
4 projects | reddit.com/r/haskell | 3 Dec 2021
compare `on` length of sublists to sort list..what am I missing?
1 project | reddit.com/r/haskell | 2 Dec 2021