diff --git a/release.md b/release.md
index 6456fe8d..5f04d58d 100644
--- a/release.md
+++ b/release.md
@@ -5,6 +5,7 @@ Full docs @ https://docs.grid.space/projects/kiri-moto
 
 # Release 3.6
 
+* threaded task and message passing performance improvements
 * refactor FDM supports and synthetic widgets to use more common code
 * allow FDM mixing of automatic and manual / detected supports
 * improve CAM animation speeds using shared array buffers
diff --git a/src/geo/polygon.js b/src/geo/polygon.js
index 1a9fe9a8..d6be990c 100644
--- a/src/geo/polygon.js
+++ b/src/geo/polygon.js
@@ -1448,9 +1448,9 @@ class Polygon {
             out = inout || [];
         out.push(poly.points.map(p => p.toClipper()));
         if (poly.inner) {
-            poly.inner.forEach(p => {
-                p.toClipper(out);
-            });
+            for (let inner of poly.inner) {
+                inner.toClipper(out);
+            }
         }
         return out;
     }