sugar start-up profiling

[Benjamin M. Schwartz]

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Eben Eliason wrote:
| Spread layout should:
...
| * Have a low big-O (O(n)? O(nlogn)? But, as we've seen, it also needs a
| fairly low constant)

Surely the layout should be cached on disk, so that the algorithm is not
invoked on boot?  The layout algorithm should only be invoked when the
list of Activities changes.

- --Ben

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