diff --git a/notes.md b/notes.md
index 18a0e280..16d0d45b 100644
--- a/notes.md
+++ b/notes.md
@@ -7,7 +7,6 @@
 
 * `P` duplicate objects should share same slice data unless rotated or scaled
 * `P` allow selection to be decimated on demand (context menu?)
-* `P` improve decimation speed: omit point conversion or use wasm
 * `P` explore widget vertex reloading / replacing (Onshape) (issue #48)
 * `P` move all persisted / workspace settings/data to IndexedDB (LS limitations)
 
diff --git a/src/geo/bounds.js b/src/geo/bounds.js
index 5cde101a..66ca02ce 100644
--- a/src/geo/bounds.js
+++ b/src/geo/bounds.js
@@ -62,7 +62,7 @@
      * @returns {Number} absolute delta in x,y coordinate space
      */
     PRO.delta = function(bounds) {
-        return
+        return 0 +
             Math.abs(this.minx - bounds.minx) +
             Math.abs(this.miny - bounds.miny) +
             Math.abs(this.maxx - bounds.maxx) +