diff --git a/README.md b/README.md
index 903d0f8..f4515bd 100644
--- a/README.md
+++ b/README.md
@@ -70,12 +70,8 @@ found anything amiss: http://akkartik.name/contact
 
 * No support yet for Unicode graphemes spanning multiple codepoints.
 
-* Undo/redo can be sluggish in large files.
-
-* Large files may grow sluggish in other ways. I've noticed in 100KB files
-  that closing the window can take a few seconds. And it seems to take longer
-  in proportion to how far down my edits are. The phenomenon persists even if
-  I take out undo history.
+* Undo/redo may be sluggish in large files. Large files may grow sluggish in
+  other ways.
 
 * If you kill the process, say by force-quitting because things things get
   sluggish, you can lose data.