title: MSEdge(IE Mode) don't release memory
body: <p>I am having a problem with gradual memory increase when browsing some pages in IE mode in Edge.
  The memory increase is caused by the iexplore.exe process.
  It seems to increase when we open some screens in showmodaldialog.
  I know that memory increases when a modal window is opened, but even after the modal window is closed, the memory has increased from before the window was displayed.
  If you have any information on the cause of this problem or similar events, we would appreciate it.</p>
  <p>Thank you in advance.</p>
  <p>I would like to know how to free memory when closing a window in IE mode.</p>