diff --git a/src/common/ecs/binpack.ts b/src/common/ecs/binpack.ts
index 61a576cb..163f4c6f 100644
--- a/src/common/ecs/binpack.ts
+++ b/src/common/ecs/binpack.ts
@@ -7,6 +7,7 @@ export interface BoxConstraints {
     width: number;
     height: number;
     box?: PlacedBox;
+    label?: string;
 }
 
 enum BoxPlacement {
@@ -76,9 +77,10 @@ export class Bin {
             let dx = (f.right - f.left) - b.width;
             let dy = (f.bottom - f.top) - b.height;
             if (dx >= 0 && dy >= 0) {
-                let score = 1 / (1 + dx + dy);
+                let score = 1 / (1 + dx + dy + f.left * 0.001);
                 if (score > bestscore) {
                     best = f;
+                    bestscore = score;
                     if (score == 1) break;
                 }
             }
@@ -188,7 +190,7 @@ export class Packer {
                     box.left = parent.right - w;
                     box.right = parent.right;
                 }
-                if (debug) console.log('place',box.left,box.top,box.right,box.bottom,parent?.left,parent?.top);
+                if (debug) console.log('place',b.label,box.left,box.top,box.right,box.bottom,parent?.left,parent?.top);
                 let parents = [parent];
                 // if approx match, might overlap multiple free boxes
                 if (approx) parents = bin.getBoxes(box, 100, bin.free);
@@ -198,4 +200,40 @@ export class Packer {
         if (debug) console.log('cannot place!',  b.left,b.top,b.width,b.height);
         return null;
     }
+    toSVG() {
+        let s = '';
+        let r = {width:100,height:70}
+        for (let bin of this.bins) {
+            r.width = Math.max(r.width, bin.binbounds.right);
+            r.height = Math.max(r.height, bin.binbounds.bottom);
+        }
+        s += `<svg viewBox="0 0 ${r.width} ${r.height}" xmlns="http://www.w3.org/2000/svg"><style><![CDATA[text {font: 1px sans-serif;}]]></style>`;
+        for (let bin of this.bins) {
+            let be = bin.extents;
+            s += '<g>'
+            s += `<rect width="${be.right-be.left}" height="${be.bottom-be.top}" stroke="black" stroke-width="0.5" fill="none"/>`;
+            let textx = be.right+1;
+            let texty = 0;
+            for (let box of this.boxes) {
+                let b = box.box;
+                if (b) {
+                    if (b.bin == bin) s += `<rect width="${b.right-b.left}" height="${b.bottom-b.top}" x="${b.left}" y="${b.top}" stroke="black" stroke-width="0.25" fill="#ccc"/>`;
+                    if (b.top == texty) textx += 10; else textx = be.right+1;
+                    texty = b.top;
+                    if (box.label) s += `<text x="${textx}" y="${texty}" height="1">${box.label}</text>`;
+                }
+            }
+            /*
+            for (let b of bin.free) {
+                s += `<rect width="${b.right-b.left}" height="${b.bottom-b.top}" x="${b.left}" y="${b.top}" stroke="red" stroke-width="0.1" fill="none"/>`;
+            }
+            */
+            s += '</g>'
+        }
+        s += `</svg>`;
+        return s;
+    }
+    toSVGUrl() {
+        return `data:image/svg+xml;base64,${btoa(this.toSVG())}`;
+    }
 }
diff --git a/src/common/ecs/ecs.ts b/src/common/ecs/ecs.ts
index 2fdfa13a..c09dd9e1 100644
--- a/src/common/ecs/ecs.ts
+++ b/src/common/ecs/ecs.ts
@@ -1389,6 +1389,7 @@ export class EntityScope implements SourceLocated {
                     bottom: stats.tempendseq+1,
                     width: instance.system.tempbytes,
                     height: stats.tempendseq - stats.tempstartseq + 1,
+                    label: instance.system.name
                 };
                 pack.boxes.push(v);
             }
@@ -1404,6 +1405,7 @@ export class EntityScope implements SourceLocated {
                 //this.bss.equates[this.dialect.tempLabel(inst)] = `TEMP+${b.box?.left}`;
             }
         }
+        console.log(pack.toSVGUrl());
     }
     private analyzeEntities() {
         this.buildSegments();
@@ -1439,6 +1441,7 @@ export class EntityScope implements SourceLocated {
     }
     replaceSubroutines(code: string) {
         // TODO: bin-packing for critical code
+        // TODO: doesn't work with nested subroutines?
         let allsubs : string[] = [];
         for (let stats of Object.values(this.eventStats)) {
             if (stats.count > 1) {
diff --git a/test/ecs/sprites.txt b/test/ecs/sprites.txt
index c56905b2..0f32e4f4 100644
--- a/test/ecs/sprites.txt
+++ b/test/ecs/sprites.txt
@@ -28,11 +28,11 @@ SpriteSlot_sprite_b0:
 TEMP:
 Kernel2Sprite__2__tmp:
 Joystick__3__tmp:
+SpriteHider__9__tmp:
 .res 1
 SpriteShuffler__8__tmp:
 .res 1
 .res 1
-SpriteHider__9__tmp:
 .res 1
 .res 1
 .res 1
diff --git a/test/ecs/sprites1.txt b/test/ecs/sprites1.txt
index db5a6be4..254293c0 100644
--- a/test/ecs/sprites1.txt
+++ b/test/ecs/sprites1.txt
@@ -28,11 +28,11 @@ HasColormap_colormap_b0:
 TEMP:
 Kernel2Sprite__2__tmp:
 Joystick__3__tmp:
+SpriteHider__9__tmp:
 .res 1
 SpriteShuffler__8__tmp:
 .res 1
 .res 1
-SpriteHider__9__tmp:
 .res 1
 .res 1
 .res 1