animation performance

Hi,

I think it would be great to have performance hints, just like rendering 
hints.

In

<!ENTITY % PresentationAttributes-Graphics

we have

shape-rendering
  (auto |
   optimizeSpeed |
   crispEdges |
   geometricPrecision |
   inherit)
text-rendering
   (auto |
    optimizeSpeed |
    optimizeLegibility |
    geometricPrecision |
    inherit)

Parallel and in addition to that I think we need someting like

<!ENTITY % animPerformanceAttrs
  "(auto |
   verySmooth |
   smooth |
   lowProcessorUsage
   inherit
   )">

"verySmooth" specifies that the player should set the highest possible 
framerate, inside an appropriate range, which also depends on the 
available resources (CPU speed, CPU usage, ...)

"smooth" should provide a good compromise between fluid animation and 
resource usage.

"lowProcessorUsage" (a better name should be chosen) assigns lowest 
priority to the fluidity of motion, and optimizes towards very low 
resource usage.

Tobi

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