Major optimization refactor, across the board

+ enable lexical-scope everywhere (lexical-binding = t): ~5-10% faster
  startup; ~5-20% general boost
+ reduce consing, function calls & garbage collection by preferring
  cl-loop & dolist over lambda closures (for mapc[ar], add-hook, and
  various cl-lib filter/map/reduce functions) -- where possible
+ prefer functions with dedicated opcodes, like assq (see byte-defop's
  in bytecomp.el for more)
+ prefer pcase & cond (faster) over cl-case
+ general refactor for code readability
+ ensure naming & style conventions are adhered to
+ appease byte-compiler by marking unused variables with underscore
+ defer minor mode activation to after-init, emacs-startup or
  window-setup hooks; a customization opportunity for users + ensures
  custom functionality won't interfere with startup.

modules/ui/nav-flash/autoload.el

@@ -0,0 +1,21 @@
+;;; ui/nav-flash/autoload.el -*- lexical-binding: t; -*-
+
+;;;###autoload
+(defun +doom*blink-cursor-maybe (orig-fn &rest args)
+  "Blink current line if the window has moved."
+  (let ((point (save-excursion (goto-char (window-start))
+                               (point-marker))))
+    (apply orig-fn args)
+    (unless (equal point
+                   (save-excursion (goto-char (window-start))
+                                   (point-marker)))
+      (+doom/blink-cursor))))
+
+;;;###autoload
+(defun +doom/blink-cursor (&rest _)
+  "Blink current line using `nav-flash'."
+  (interactive)
+  (unless (minibufferp)
+    (nav-flash-show)
+    ;; only show in the current window
+    (overlay-put compilation-highlight-overlay 'window (selected-window))))