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I was working on a grass animation with a wind force field.
First the animation in the 3D view was running at normal speed (~20 fps) then I adjusted a few settings like Stiffness and Bending. And now the animation is running very slow (~0.8 fps).
I loaded an old save file that worked just fine before, but even there the animation speed is now achingly slow. Do I have to clean up or refresh something I don't know about? Is this a known problem and is their a way to solve it?

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    $\begingroup$ An example file at least would be very helpful for others to see what's going on. You can upload it to Pasteall.org. $\endgroup$ – Leon Cheung Nov 19 '14 at 1:24
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    $\begingroup$ Blender caches things like cloth physics so that they can be played back quickly, but changing settings will invalidate this cache. The only thing to be done is to re-simulate and cache it (by playing the animation through once) or bake it (by pressing Bake in the cache panel). Baking will simulate and "lock" the cache and prevent it from being invalidated, but as such you won't be able to change settings. $\endgroup$ – gandalf3 Nov 19 '14 at 2:17
  • $\begingroup$ Thank you for your answers. I tried playing through the animation again and baking it. But even with all the frames in memory there is still no change :/ I uploaded an example file pasteall.org/blend/32947 $\endgroup$ – user8080 Nov 19 '14 at 9:23

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