memo-parser cautionary note

Author: benmosher

memo-parser/README.md

@@ -1,5 +1,13 @@
 # eslint-plugin-import/memo-parser
 
+
+## NOTE!
+
+This used to improve performance, but as of ESLint 5 and v2 of this plugin, it seems to just consume a bunch of memory and slightly increase lint times.
+
+**Not recommended for use at this time!**
+
+
 This parser is just a memoizing wrapper around some actual parser.
 
 To configure, just add your _actual_ parser to the `parserOptions`, like so: