diff --git a/content/slides.ipynb b/content/slides.ipynb
index 41622d8..cd426a8 100644
--- a/content/slides.ipynb
+++ b/content/slides.ipynb
@@ -11,7 +11,7 @@
     "tags": []
    },
    "source": [
-    "<pre> &#8593;&#8593;&#8593;&#8593;&#8593;&#8593;</pre>\n",
+    "&#8593;&#8593;&#8593;&#8593;&#8593;&#8593;  <p style=\"text-align: right;\">&#8593;&#8593;&#8593;&#8593;&#8593;&#8593;</p>\n",
     "\n",
     "**To view this notebook as a slideshow click on the deck icon ![deck](https://raw.githubusercontent.com/deathbeds/jupyterlab-deck/main/docs/_static/deck.svg) above.**\n",
     "\n",
@@ -53,7 +53,7 @@
     "- Introduction and motivation for RNTuple.\n",
     "- Status of RNTuple support in Uproot.\n",
     "- Hands-on demo.\n",
-    "- Future work and outlook"
+    "- Future work and outlook."
    ]
   },
   {
@@ -735,7 +735,7 @@
    "source": [
     "### We can already ready complex files\n",
     "\n",
-    "Here is an example of a file produced by an ATLAS workflow."
+    "Here is an example of a file produced with an ATLAS workflow."
    ]
   },
   {
@@ -758,8 +758,8 @@
     "\n",
     "# For WASM we need some workarounds\n",
     "import requests\n",
-    "r = requests.get(f\"https://corsproxy.io/?{url}\") # Please be careful when using a CORS proxy\n",
-    "open(\"DAOD_TRUTH3_RC2.root\", \"wb\").write(r.content)\n",
+    "#r = requests.get(f\"https://corsproxy.io/?{url}\") # Please be careful when using a CORS proxy\n",
+    "#open(\"DAOD_TRUTH3_RC2.root\", \"wb\").write(r.content)\n",
     "f = uproot.open(\"DAOD_TRUTH3_RC2.root\")"
    ]
   },
@@ -856,50 +856,16 @@
    },
    "outputs": [],
    "source": [
+    "# 4M events\n",
     "url = \"http://root.cern/files/tutorials/ntpl004_dimuon_v1rc2.root\"\n",
     "\n",
     "# When not using WASM we can read the file directly\n",
     "# f = uproot.open(f\"simplecache::{url}\")\n",
+    "# ntpl = f[\"Events\"]\n",
+    "# arrays = ntpl.arrays() # Takes ~1 second\n",
     "\n",
-    "# For WASM we need some workarounds\n",
-    "import requests\n",
-    "r = requests.get(f\"https://corsproxy.io/?{url}\") # Please be careful when using a CORS proxy\n",
-    "open(\"ntpl004_dimuon_v1rc2.root\", \"wb\").write(r.content)\n",
-    "f = uproot.open(\"ntpl004_dimuon_v1rc2.root\")"
-   ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": null,
-   "id": "b63b5c19-d84f-491a-9622-2d3d5f6fc1f3",
-   "metadata": {
-    "editable": true,
-    "slideshow": {
-     "slide_type": "fragment"
-    },
-    "tags": []
-   },
-   "outputs": [],
-   "source": [
-    "f.classnames()"
-   ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": null,
-   "id": "65757acb-1c47-42f4-9198-1a89267b3aa3",
-   "metadata": {
-    "editable": true,
-    "slideshow": {
-     "slide_type": "fragment"
-    },
-    "tags": []
-   },
-   "outputs": [],
-   "source": [
-    "ntpl = f[\"Events\"]\n",
-    "arrays = ntpl.arrays()\n",
-    "arrays"
+    "# Performance is still not very good on WASM so we'll skip it here,\n",
+    "# but you can try it with your native install."
    ]
   },
   {
@@ -932,8 +898,8 @@
     "import awkward as ak\n",
     "from hist import Hist\n",
     "\n",
-    "h = Hist.new.Regular(50, 0, 70, name=\"pt\", label=\"Muon $p_T$\").Double()\n",
-    "h.fill(pt=ak.flatten(arrays.Muon_pt))\n",
+    "h = Hist.new.Regular(50, 0, 70000, name=\"pt\", label=\"Muon $p_T$\").Double()\n",
+    "h.fill(pt=ak.flatten(arrays[\"AntiKt4TruthDressedWZJetsAux:\"].pt))\n",
     "h.plot();"
    ]
   },
@@ -976,7 +942,7 @@
     "tags": []
    },
    "source": [
-    "- Lazy-reading will be implemented with `dask`, just how it has been done for `TTree`."
+    "- Lazy-reading will be implemented with `dask`, just how it was done for `TTree`."
    ]
   },
   {
@@ -1018,7 +984,7 @@
     "tags": []
    },
    "source": [
-    "- `uproot` will become even more useful since it should support almost 100% of the `RNTuple` spec, and so should be almost equivalent to `ROOT` for reading and writing.\n",
+    "- `uproot` will become even more useful since it should support almost 100% of the `RNTuple` spec, and so should be almost equivalent (albeit slower) to `ROOT` for reading and writing.\n",
     "\n",
     "<center><img src=\"https://raw.githubusercontent.com/ariostas-talks/2024-07-02-pyhep-uproot-rntuple/main/images/rntuple_goal.svg\" style=\"height:400px;\"/></center>"
    ]