Performence issue with large elm files

[miltonio94]

Hello,
I've been having some big performance issues with elm mode in large files. I have noticed it be particularly bad in one file in specific that is 11737 lines long. The weird thing is that it doesn't happen at all times, but the auto-indenting completely stalls emacs for seconds. I have not been able to identify what triggers it. At first, I thought it was because of me being on a zoom call or a slack call, but I get the problem even when I'm not under those circumstances.
My work machine (where I have been having this issue) is no slouch either. It has an i7 and 42Gb of RAM.
I use this package with doom emacs at the moment.

I'm new to writing issues so if anything isn't up to scratch, let me know.

[purcell]

Is that auto-indenting with elm-format (e.g. when you save), or you mean using the Emacs commands (e.g. mark whole buffer, reindent)?

[miltonio94]

yeah, on save with elm-format, it also happens when i run just the command. It keeps giving me a timeout error. I thought this was due to the size of the file, but when i run the elm-format command from the terminal it runs it fine on these large files in less than a second without any hangup. (sorry it took some time to reply, i missed the notification). I have also noticed that this happens on most files that have more than 1k lines of code, and this is after doing all the little optimization tips and tricks recommended by the lsp

[purcell]

Thanks. Would you mind sharing which emacs version you're using?

[miltonio94]

I found the issue originally on emacs 27, I'm currently using 29.0.5 which has had a slight performance boost for me