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Introduction

Throughout my time using GNU Emacs and its package ecosystem, I've found some annoying quirks that took a while to figure out, and I'm documenting them here. This will be a living document.

Fixes

General Stutters (Caused by Garbage Collection)

Garbage collection stutters is a common problem among Emacs users, and I have a constroversial solution which has worked for me. Basically: only garbage collect when you are idle (even for short periods of time). Read more about it here.

(defun my-minibuffer-setup-hook ()
  (setq gc-cons-threshold most-positive-fixnum))

(defun my-minibuffer-exit-hook ()
  (setq gc-cons-threshold 800000000))

(setq gc-cons-threshold most-positive-fixnum)

(run-with-idle-timer 1.2 t 'garbage-collect)

Lsp-Mode Gives Bad Completion Results

Sometimes completion results won't refresh or refilter. This one pissed me off for a while because I couldn't quite nail down whose fault it was. It turns out that it was lsp-mode being overzealous with caching. There is a cape transformer which breaks the cache and fixes the results. Here's part of my config:

(use-package cape
  :init
  (defun my/lsp-capf-busted ()
    "Return an uncached LSP completion function."
    (cape-capf-buster #'lsp-completion-at-point))
  (add-hook 'lsp-completion-mode-hook
            (lambda ()
              (setq-local completion-at-point-functions
                          (list (my/lsp-capf-busted))))))

General Advice

Which Lsp Client?

I use lsp-mode. I would love to switch to eglot, but I really like lsp-ui's peek feature and it hasn't been ported to eglot yet. There are several other lsp clients meant to increase speed (such as lsp-bridge), but I've got the best results on lsp-mode with lsp-booster.

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