[Trac #259] sketch activity is laggy drawing on the tablet.

[Zarro Boogs per Child]

#259: sketch activity is laggy drawing on the tablet.
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 Reporter:  jg       |        Owner:  blizzard
     Type:  defect   |       Status:  new     
 Priority:  high     |    Milestone:  BTest-2 
Component:  sugar    |   Resolution:          
 Keywords:  relnote  |  
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Comment (by marco):

 Btw I suspect this is actually due to the fact that the sketchpad code
 stupidly redraw the whole canvas rather than just the changed part. If
 it's that it should be pretty easy to fix.

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Ticket URL: <http://dev.laptop.org/ticket/259#comment:7>
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