#3467 NORM First D: Unmap nonvisible windows?

[Zarro Boogs per Child]

#3467: Unmap nonvisible windows?
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  Reporter:  cjb              |       Owner:  cjb                   
      Type:  enhancement      |      Status:  new                   
  Priority:  normal           |   Milestone:  First Deployment, V1.0
 Component:  x window system  |     Version:                        
Resolution:                   |    Keywords:  performance           
  Verified:  0                |  
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Comment(by bernie):

 I have no deep knowledge of these issues, but, as far as
 I know, mapping an X window should not automatically
 translate in any allocation of video or system memory.

 The contents of windows are not normally preserved by
 the server.  I know the following exceptions, neither
 of which should apply to our environment:

  * Redirected windows (for Composite, which we don't use)

  * save unders, which is requested typically for menus,
    tooltips and other small/transient windows.  The
    buffer is only as big as the covering window.

  * backing-store, which is a server-global setting (off by
    default) and can be requested by individual clients,
    setting a window manager hint.

 When cycling through activities, very slow redraws are
 visible, which means that the windows get expose
 events from the X server.  If their content was backed
 by an off-screen buffer, they wouldn't need to repaint.

 Of course, I may be misunderstanding the issue.

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Ticket URL: <https://dev.laptop.org/ticket/3467#comment:2>
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