As an aside, this is kind of what I've been worried about because this is very definitely a problem with Sibelius, Spitfire and Microsoft: all I did was do XML and patches, which work as described... which reminds me, Spitfire have a lot of documents about optimising their libraries - crackling isn't necessarily just a Sibelius thing, the Spitfire player has its own issues which people spend much time complaining about on the Spitfire forums.
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There's a demo file called "Zoids.sib" in the Documents/Sibelius Services/BBC Symphony Orchestra Core directory, along with other documents. The other best thing to do is to start using it in your own compositions and see how that goes. An idea for an optimisation that might help from my end did occur to me though, so I will be doing that next week.