diff --git a/examples/parallel_example.ipynb b/examples/parallel_example.ipynb
index 162e4f2..3db2a1c 100644
--- a/examples/parallel_example.ipynb
+++ b/examples/parallel_example.ipynb
@@ -18,9 +18,12 @@
     "SAMPLING_RATE = 16000\n",
     "import torch\n",
     "from pprint import pprint\n",
+    "\n",
     "torch.set_num_threads(1)\n",
+    "NUM_PROCESS=4 # set to the number of CPU cores in the machine\n",
+    "NUM_COPIES=8\n",
     "# download wav files, make multiple copies\n",
-    "for idx in range(4):\n",
+    "for idx in range(NUM_COPIES):\n",
     "    torch.hub.download_url_to_file('https://models.silero.ai/vad_models/en.wav', f\"en_example{idx}.wav\")\n"
    ]
   },
@@ -39,15 +42,15 @@
    "outputs": [],
    "source": [
     "model, utils = torch.hub.load(repo_or_dir='snakers4/silero-vad',\n",
-    "                              model='silero_vad',\n",
-    "                              force_reload=True,\n",
-    "                              onnx=False)\n",
+    "                                model='silero_vad',\n",
+    "                                force_reload=True,\n",
+    "                                onnx=False)\n",
     "\n",
     "(get_speech_timestamps,\n",
-    " save_audio,\n",
-    " read_audio,\n",
-    " VADIterator,\n",
-    " collect_chunks) = utils"
+    "save_audio,\n",
+    "read_audio,\n",
+    "VADIterator,\n",
+    "collect_chunks) = utils"
    ]
   },
   {
@@ -64,7 +67,12 @@
    "metadata": {},
    "outputs": [],
    "source": [
+    "def init_model(model):\n",
+    "  global vad_model\n",
+    "  vad_model = model\n",
+    "\n",
     "def vad_process(audio_file: str):\n",
+    "    global vad_model\n",
     "    with torch.no_grad():\n",
     "        wav = read_audio(audio_file, sampling_rate=SAMPLING_RATE)\n",
     "        return get_speech_timestamps(\n",
@@ -97,8 +105,10 @@
     "from concurrent.futures import ProcessPoolExecutor, as_completed\n",
     "\n",
     "futures = []\n",
-    "with ProcessPoolExecutor(max_workers=4) as ex:\n",
-    "    for i in range(4):\n",
+    "NUM_COPIES=20\n",
+    "\n",
+    "with ProcessPoolExecutor(max_workers=NUM_PROCESS) as ex:\n",
+    "    for i in range(NUM_COPIES):\n",
     "        futures.append(ex.submit(vad_process, f\"en_example{idx}.wav\"))\n",
     "\n",
     "for finished in as_completed(futures):\n",