Performance and kill-ring changes from https://emacsredux.com/blog/2026/04/07/stealing-from-the-best-emacs-configs/

writing.el

@@ -22,6 +22,23 @@
 
 ;;; Code:
 
+;; Save interprogram copies
+(setq save-interprogram-paste-before-kill t)
+
+;; Prevent duplicates in the kill ring
+(setq kill-do-not-save-duplicates t)
+
+;; Save kill ring between sessions
+(setq savehist-additional-variables
+      '(search-ring regexp-search-ring kill-ring))
+
+;; Remove text properties from the saved killring
+(add-hook 'savehist-save-hook
+          (lambda ()
+            (setq kill-ring
+                  (mapcar #'substring-no-properties
+                          (cl-remove-if-not #'stringp kill-ring)))))
+
 ;; Save place in file
 (save-place-mode 1)