diff --git a/notes.md b/notes.md
index 4294bec1..dec822aa 100644
--- a/notes.md
+++ b/notes.md
@@ -99,8 +99,9 @@
 
 * `P` common part pre-analyze to speed up 'slice' and improve shadow (overhangs)
 * `P` redo all path route / planning in prepare to account for terrain before camOut
-* `P` detect render message backlog and pause or warn
+* `P` detect render message backlog and pause or warn?
 * `P` allow faster z movements when contouring (not plunging)
+* `P` common / faster shadow generator using vertices shared with ledges
 
 # Laser
 
diff --git a/src/kiri/init.js b/src/kiri/init.js
index 3b6c45a6..db42243c 100644
--- a/src/kiri/init.js
+++ b/src/kiri/init.js
@@ -1999,9 +1999,17 @@
                 xv = parseFloat(UI.sizeX.was),
                 yv = parseFloat(UI.sizeY.was),
                 zv = parseFloat(UI.sizeZ.was),
-                xr = (UI.lockX.checked ? ra : 1),
-                yr = (UI.lockY.checked ? ra : 1),
-                zr = (UI.lockZ.checked ? ra : 1);
+                ta = e.target,
+                xc = UI.lockX.checked,
+                yc = UI.lockY.checked,
+                zc = UI.lockZ.checked,
+                xt = ta === UI.sizeX,
+                yt = ta === UI.sizeY,
+                zt = ta === UI.sizeZ,
+                tl = (xt && xc) || (yt && yc) || (zt && zc),
+                xr = ((tl && xc) || (!tl && xt) ? ra : 1),
+                yr = ((tl && yc) || (!tl && yt) ? ra : 1),
+                zr = ((tl && zc) || (!tl && zt) ? ra : 1);
             API.selection.scale(xr,yr,zr);
             UI.sizeX.was = UI.sizeX.value = xv * xr;
             UI.sizeY.was = UI.sizeY.value = yv * yr;
@@ -2015,9 +2023,17 @@
                 xv = parseFloat(UI.scaleX.was),
                 yv = parseFloat(UI.scaleY.was),
                 zv = parseFloat(UI.scaleZ.was),
-                xr = (UI.lockX.checked ? ra : 1),
-                yr = (UI.lockY.checked ? ra : 1),
-                zr = (UI.lockZ.checked ? ra : 1);
+                ta = e.target,
+                xc = UI.lockX.checked,
+                yc = UI.lockY.checked,
+                zc = UI.lockZ.checked,
+                xt = ta === UI.scaleX,
+                yt = ta === UI.scaleY,
+                zt = ta === UI.scaleZ,
+                tl = (xt && xc) || (yt && yc) || (zt && zc),
+                xr = ((tl && xc) || (!tl && xt) ? ra : 1),
+                yr = ((tl && yc) || (!tl && yt) ? ra : 1),
+                zr = ((tl && zc) || (!tl && zt) ? ra : 1);
             API.selection.scale(xr,yr,zr);
             UI.scaleX.was = UI.scaleX.value = xv * xr;
             UI.scaleY.was = UI.scaleY.value = yv * yr;
@@ -2053,6 +2069,22 @@
             $('rot_z'),       selectionRotate
         ]);
 
+        $('lab-axis').onclick = () => {
+            UI.lockX.checked =
+            UI.lockY.checked =
+            UI.lockZ.checked = !(
+                UI.lockX.checked ||
+                UI.lockY.checked ||
+                UI.lockZ.checked
+            );
+        };
+
+        $('lab-scale').onclick = () => {
+            API.selection.scale(1 / UI.scaleX.was, 1 / UI.scaleY.was, 1 / UI.scaleZ.was);
+            UI.scaleX.value = UI.scaleY.value = UI.scaleZ.value =
+            UI.scaleX.was = UI.scaleY.was = UI.scaleZ.was = 1;
+        };
+
         UC.onBlur([
             UI.toolName,
             UI.toolNum,
diff --git a/web/kiri/index.css b/web/kiri/index.css
index 2d07ad6c..f4a6211e 100644
--- a/web/kiri/index.css
+++ b/web/kiri/index.css
@@ -1500,3 +1500,11 @@ th, tr, td, label {
     border-top: 1px solid #ddd;
     margin: 5px 0 5px 0;
 }
+
+#lab-axis, #lab-scale {
+    padding: 0 6px 0 6px;
+    border-radius: 3px;
+}
+#lab-axis:hover, #lab-scale:hover {
+    background-color: rgba(0,0,0,0.2);
+}
diff --git a/web/kiri/index.html b/web/kiri/index.html
index b6cf9d1d..e3760d58 100644
--- a/web/kiri/index.html
+++ b/web/kiri/index.html
@@ -222,9 +222,9 @@
                         <div><input id="scale_z" xsize="8" class="value" value="1"/></div>
                     </div>
                     <div class="f-col j-center">
-                        <div><label>axis</label></div>
-                        <div><label>size</label></div>
-                        <div><label>scale</label></div>
+                        <div><label id="lab-axis">axis</label></div>
+                        <div><label id="lab-size">size</label></div>
+                        <div><label id="lab-scale">scale</label></div>
                     </div>
                 </div>
             </div>