feat(lsp): Improve lsp-mode performance, support latest 7.x version

company-lsp is no longer supported by lsp-mode for providing completions
to company, instead company-capf should be used which it built-in to
company itself.

core/siren-core-modules.el

@@ -73,7 +73,6 @@
 ;; Language Servers
 (require 'siren-lsp)
 (require 'siren-lsp-ui)
-(require 'siren-company-lsp)
 (require 'siren-helm-lsp)
 
 ;; Shell

core/siren-core-performance.el

@@ -14,7 +14,7 @@
 
   :custom
   (gcmh-idle-delay 10)
-  (gcmh-high-cons-threshold 16777216))
+  (gcmh-high-cons-threshold 104857600))
 
 (provide 'siren-core-performance)
 ;;; siren-core-performance.el ends here

modules/lsp/siren-company-lsp.el

@@ -1,16 +0,0 @@
-;;; siren-company-lsp.el --- jimeh's Emacs Siren: company-lsp configuration.
-
-;;; Commentary:
-
-;; Basic configuration for company-lsp.
-
-;;; Code:
-
-(require 'siren-company)
-(require 'siren-lsp)
-
-(use-package company-lsp
-  :defer t)
-
-(provide 'siren-company-lsp)
-;;; siren-company-lsp.el ends here

modules/lsp/siren-lsp.el

@@ -16,8 +16,18 @@
   (lsp-mode . siren-lsp-mode-setup)
 
   :custom
-  (lsp-keymap-prefix "M-;")
   (lsp-eldoc-render-all nil)
+  (lsp-enable-xref t)
+  (lsp-enable-file-watchers t)
+  (lsp-enable-imenu t)
+  (lsp-keymap-prefix "M-;")
+  (lsp-prefer-capf t)
+
+  ;; Set read process output to 1MB, instead of default 4KB. As many language
+  ;; servers produce output ranging from 800KB to 3MB, leaving it at 4KB affects
+  ;; performance. More info here:
+  ;; https://emacs-lsp.github.io/lsp-mode/page/performance/
+  (read-process-output-max (* 1024 1024))
 
   :init
   (defun siren-lsp-mode-setup ()