Further housekeeping, bring the initial load down to under 1500 ms

Make the editor load faster by deferring as much as possible until
later use. For example, LSP load is now deferred until first use and
no longer blocking.

Use only elixir-format from elixir-mode, for similar speed
reasons. The rest of the package has been taken over by the treesitter
version of the mode.

lisp/icejam-lsp.el

@@ -4,8 +4,11 @@
 ;;; Code:
 (require 'icejam-blocking)
 
-;; (use-package lsp-mode :ensure (:depth 5) :requires (company))
-(with-eval-after-load 'lsp-mode
+;; https://emacs-lsp.github.io/lsp-mode/page/performance/#use-plists-for-deserialization
+;; This supposedly makes it faster.
+(setenv "LSP_USE_PLISTS" "true")
+(use-package lsp-mode :ensure t :defer t
+  :config
   (add-to-list 'lsp-disabled-clients '(typescript-ts-mode . vue-semantic-server))
   (add-to-list 'lsp-disabled-clients '(js-mode . vue-semantic-server))
   (add-to-list 'lsp-disabled-clients '(css-mode . vue-semantic-server))
@@ -60,8 +63,8 @@
   (unbind-key "s-l s r" lsp-mode-map)
   (unbind-key "s-l s s" lsp-mode-map))
 
-(use-package lsp-ui :ensure t :after (lsp-mode))
-(with-eval-after-load 'lsp-ui
+(use-package lsp-ui :ensure t :after (lsp-mode) :defer t
+  :config
   (setopt lsp-ui-doc-enable t
           lsp-ui-header t
           lsp-ui-delay 0.5 ;; Wait half a second to display documentation
@@ -69,7 +72,7 @@
           lsp-ui-doc-include-signature t))
 
 ;; Lsp debugger mode
-(use-package dap-mode :ensure t :after (lsp-mode lsp-ui))
+(use-package dap-mode :ensure t :after (lsp-mode lsp-ui) :defer t)
 
 (provide 'icejam-lsp)
 ;;; icejam-lsp.el ends here