{"i":19,"slug":"prompt-cache-across-sessions","chart":{"id":"cache-sessions-turn-time","title":"Claude Sonnet 5.5 · Claude Code: time per turn, by setup","subtitle":"Median of 3 sessions; whiskers = fastest and slowest of the 3","kind":"dot-range","unit":"seconds","yLabel":"Seconds","series":[{"name":"Turn 1 (the ledger and question 1)","points":{"$k":["label","value","lo","hi","n"],"$r":[["A: new folder each time",1.56,1.34,1.62,3],["B: fixed folder",1.76,1.71,1.86,3],["C: fixed folder, ledger in system prompt",1.77,1.69,1.78,3]]}},{"name":"Turn 2 (question 2)","points":{"$k":["label","value","lo","hi","n"],"$r":[["A: new folder each time",1.02,0.88,1.14,3],["B: fixed folder",1.33,1.31,1.37,3],["C: fixed folder, ledger in system prompt",1.13,1.09,1.29,3]]}}],"note":"Whiskers are a range (fastest and slowest of 3 sessions), not a confidence interval. Turn 2 read the cache in every setup. This design does not isolate a cache effect on speed. Ledger seed and call order also differ. The Mac also ran other agent work during these calls.","whisker":"minmax","sourceIds":["agent-cache-sessions"]}}