title: Rendering performance in case of embedded containers
body: <p>I have an application which displays a web-cam output in a widget using SDL. I am getting output of order of 20-25 frames per second with this.</p>
  
  <p>This output is then embedded into a QX11EmbedWidget container created in another process.
  ( or in another implementation using XLib I re-parented this output of SDL window to a native X11 window ).</p>
  
  <p>Output I am obtaining in this case is around 2-5 frames per second.</p>
  
  <p>Platform: Ubuntu on I.MX-53</p>
  
  <p>Q1. Can some give an explanation of this difference in performance for these two cases.</p>
  
  <p>Q2. When we embed an application's output into another's window, is it that rendering happens twice ? Once, by the application which is getting embedded, and then by the applications in which this window was embedded ?</p>