In order for things to run quickly you need an Nvidia GPU. Training on a CPU is extremely slow. Your best bet is to use Colab, Kaggle or Paperspace. Colab and Kaggle have a modified version of Jupyter and I believe you can use Jupyterlab on Paperspace. If you click the links in GitHub - fastai/fastbook: The fastai book, published as Jupyter Notebooks it will open in Colab which is interactive.
There is a getting started guide in Lesson 1 of the 2022 course here: Practical Deep Learning for Coders - 1: Getting started
You will also probably find these live coding sessions helpful: Live coding 1