Reduce maintenance overhead of the path cache. - #1064
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Instead of setting a timeout each time the cache is accessed, set only one timeout at a time, and keep a record of which items it should be updating.
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Instead of setting a timeout each time the cache is accessed, set only one
timeout at a time, and keep a record of which items it should be updating.
This seems to significantly improve performance in our use-case (note that the overhead of the old version is in the many many timeout functions, so you wouldn't notice it when drawing a single scene – but it adds up if you're progressively drawing a scene over time.)