[sldev] Viewer optimization patch.

[Jason Giglio]

While I've worked on some patches to optimize particular areas of the
client, I decided to try a more holistic approach.

It seems to be working.  The attached patch retains all of the current
usefulness of the client, and should be fully backward compatible.
Benchmarking has shown a speedup ranging from 5-10x compared to the
standard client.

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