Add flx to list of default packages

README.md

@@ -430,6 +430,18 @@ you don't like that simply add this to your personal config:
                 'move-beginning-of-line)
 ```
 
+### Poor ido matching performance on large datasets
+
+Prelude swaps the default `ido` flex matching with the more powerful
+[ido-flx](https://github.com/lewang/flx). This might introduce some
+performance problems with huge datasets. If you experience lag in
+`ido`, please, report an issue upstream. You can always disable the
+improved matching algorithm like this:
+
+```lisp
+(flx-ido-mode -1)
+```
+
 ### Windows compatibility
 
 While everything in Prelude should work fine in Windows, I test it only

core/prelude-editor.el

@@ -213,6 +213,7 @@ Will only occur if prelude-whitespace is also enabled."
 ;; ido-mode
 (require 'ido)
 (require 'ido-ubiquitous)
+(require 'flx-ido)
 (setq ido-enable-prefix nil
       ido-enable-flex-matching t
       ido-create-new-buffer 'always
@@ -222,6 +223,10 @@ Will only occur if prelude-whitespace is also enabled."
       ido-default-file-method 'selected-window)
 (ido-mode +1)
 (ido-ubiquitous +1)
+;; smarter fuzzy matching for ido
+(flx-ido-mode +1)
+;; disable ido faces to see flx highlights
+(setq ido-use-faces nil)
 
 ;; smex, remember recently and most frequently used commands
 (require 'smex)

core/prelude-packages.el

@@ -42,7 +42,7 @@
 
 (defvar prelude-packages
   '(ace-jump-mode ack-and-a-half dash diminish elisp-slime-nav
-    expand-region flycheck gist
+    expand-region flx flycheck gist
     git-commit-mode gitconfig-mode gitignore-mode grizzl
     guru-mode helm helm-projectile ido-ubiquitous
     key-chord magit rainbow-mode

init.el

@@ -72,6 +72,10 @@ by Prelude.")
 (add-to-list 'load-path prelude-vendor-dir)
 (prelude-add-subfolders-to-load-path prelude-vendor-dir)
 
+;; reduce the frequency of garbage collection by making it happen on
+;; each 50MB of allocated data (the default is on every 0.76MB)
+(setq gc-cons-threshold 50000000)
+
 ;; the core stuff
 (require 'prelude-packages)
 (require 'prelude-ui)