title: Browsing directories in Jupyter dashboard very slow
body: <p>I'm using Jupyter on Windows 7 to browse my local directories, view various files and open jupyter notebooks. However, changing from one to another directory takes around 3 up to 60 seconds, while opening the same folder using File Explorer is close to instantaneous. 
  To be specific, the inteface showing the current directory and 'Files', 'Running', 'Clusters' tabs are fast to load. It is the list of files in the current directory that takes a very long time to load.</p>
  
  <p>Is there a way to speed up browsing directories in the Jupyter dashboard? What may be reasons that make the Jupyter dashboard so slow?</p>