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    <p>Double buffering is a technique to reduce flickering: You draw to one buffer while another buffer is displayed, and then swap them out in a single operation, so the user doesn't see any of the drawing in a partial state.</p> <p>However, it does not really help for performance problems at all, as there is still the same amount of drawing. I would not try to use double buffering if you don't have a problem with flickering, as it requires more memory and flickering may be implicitly prevented by the system by similar or other means.</p> <p>If you think drawing the background is too expensive, there are several things that you could look into:</p> <ul> <li><p>Do you scale the background image down while drawing? If so, create a downscaled version once and use this for clearing the background, reducing the drawing costs per iteration.</p></li> <li><p>Remember the "dirty" areas and just draw the portions of the background that were obscured. This will add some management overhead but reduce the number of pixels that need to be touched significantly</p></li> <li><p>Make the background the background image of the canvas DOM element and just clear the canvas to transparency in each iteration. If the canvas is very large, you could make this faster by remembering the "dirty" areas and just clearing them.</p></li> <li><p>Are you sure painting the background is the main cause of lag? Do you still have lag when you only repaint the background and do not do much else?</p></li> </ul>
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    1. POImproving Html5 canvas with double buffering?
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    1. USStefan Haustein
    1. USStefan Haustein
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Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

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