diff --git a/examples/RoughCanvas.ipynb b/examples/RoughCanvas.ipynb
index f2c3f20..8857057 100644
--- a/examples/RoughCanvas.ipynb
+++ b/examples/RoughCanvas.ipynb
@@ -197,6 +197,41 @@
     "\n",
     "c"
    ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Draw thousands of shapes at once"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "n_particles = 3_000\n",
+    "\n",
+    "import numpy as np\n",
+    "\n",
+    "x = np.array(np.random.rayleigh(250, n_particles), dtype=np.int32)\n",
+    "y = np.array(np.random.rayleigh(250, n_particles), dtype=np.int32)\n",
+    "size = np.random.randint(4, 8, n_particles)\n",
+    "\n",
+    "canvas = RoughCanvas(width=800, height=500)\n",
+    "\n",
+    "canvas"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "canvas.fill_rects(x, y, size)"
+   ]
   }
  ],
  "metadata": {
@@ -215,7 +250,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.8.3"
+   "version": "3.8.5"
   }
  },
  "nbformat": 4,