doc/README

graphmod: add config cache

Before, we'd lookup the branch for every edge segment in the entire
graph: extremely expensive. This happened even when no per-branch
settings existed.

Now we define a revision -> config cache function that's LRU-cached
and is a no-op when no configuration exists. Still not terribly fast,
but hopefully only one real branch lookup per revision. This might
degenerate for wide graphs as the LRU is hard-coded to 20 elements.

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