title: Jupyter notebook has become very slow suddenly
body: <p>I used to run jupyter in an anaconda environment very well.
  After showing a warning on</p>
  
  <pre><code>IOPub data rate exceeded.
  The notebook server will temporarily stop sending output
  to the client in order to avoid crashing it.
  To change this limit, set the config variable
  `--NotebookApp.iopub_data_rate_limit`.
  </code></pre>
  
  <p>once I changed it by this command:</p>
  
  <pre><code>$jupyter notebook --NotebookApp.iopub_data_rate_limit=2147483647
  </code></pre>
  
  <p>it has suddenly become very slow, even it is not opening the content of the notebook. In the left bottom of Google chrome browser shows :</p>
  
  <p><a href="https://i.stack.imgur.com/X7LQF.png" rel="noreferrer"><img src="https://i.stack.imgur.com/X7LQF.png" alt="enter image description here"></a></p>
  
  <p>And take long time to open the notebook, and the color of the opened notebook in <code>Home</code> is not green. I do not know why?
  What is the reason and how can I restart Jupyter Notebook configuration?</p>
  
  <p>Could you please help me with this? </p>