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.

core/autoload/memoize.el

@@ -1,4 +1,4 @@
-;;; memoize.el
+;;; core/autoload/memoize.el -*- lexical-binding: t; -*-
 
 ;;;###autoload
 (defvar doom-memoized-table (make-hash-table :test 'equal :size 10)
@@ -23,7 +23,9 @@ and the value is the function's return value.")
   "Create a memoize'd function. NAME, ARGLIST, DOCSTRING and BODY
 have the same meaning as in `defun'."
   (declare (indent defun) (doc-string 3))
-  `(progn
+  `(,(if (bound-and-true-p byte-compile-current-file)
+         'with-no-warnings
+       'progn)
      (defun ,name ,arglist ,@body)
      (doom-memoize ',name)))