title: Excel sheet takes up a lot of memory
body: <p>I designed a tool in Excel that contains a sheet that acts as a user input form.</p>
  
  <p>On the sheet is an active-x combo box, eight shapes with assigned macros, and a range formatted with colour and borders to display data.</p>
  
  <p>This sheet takes up around 3Mb of memory. I made a copy and after deleting this sheet the file size drops to around 200Kb and everything is much smoother.</p>
  
  <p>So far I have tried:</p>
  
  <ul>
  <li>Unhiding all rows/columns and filling all cells in with "No fill"</li>
  <li>Eliminating excessive formatting tool (Inquire tab on the ribbon)</li>
  <li>Deleting all shapes/combo box one by one</li>
  <li>Removing borders and all text</li>
  <li>'Demerging' all merged cells</li>
  <li>Removing unused styles</li>
  <li>Removing conditional formatting</li>
  </ul>
  
  <p>I was left with a completely blank sheet, and still after deleting the sheet the file size dropped by 3MB.</p>
  
  <p>Why might this  be happening?</p>