A swarm card takes about 0.4–0.8 s to draw in release on a workstation, more on the 2 GB box. A closed week's card only changes when an account leaves, yet it shares the 64-entry LRU with every share card and badge. Measure the draw time on the production box, and keep closed weeks' PNGs longer (on disk, keyed as now by everything drawn on them) so a link posted widely is drawn once.
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