a bit better performance

test/sandbox.html

@@ -37,20 +37,21 @@
       });
       const layer = new Konva.Layer();
       stage.add(layer);
-      const rect = new Konva.Rect({
-        x: 0,
-        y: 0,
-        width: 100,
-        height: 100,
-        fill: 'red',
-        filters: [Konva.Filters.Blur],
-        blurRadius: 10,
-      });
-      layer.add(rect);
-      rect.cache();
-      setInterval(() => {
-        rect.blurRadius(rect.blurRadius() + 1);
-      }, 100);
+      console.time('load');
+      for (var i = 0; i < 30000; i++) {
+        const shape = new Konva.Circle({
+          x: Math.random() * stage.width(),
+          y: Math.random() * stage.height(),
+          radius: 10,
+          draggable: true,
+          fill: Konva.Util.getRandomColor(),
+        });
+        layer.add(shape);
+      }
+      console.timeEnd('load');
+      console.time('draw');
+      layer.draw();
+      console.timeEnd('draw');
     </script>
   </body>
 </html>