- In short
- Modeling cache economics means weighing cache write overhead against call frequency and prefix size rather than enabling caching by default. Whether caching a prefix pays off depends on how often it is reused and how large it is, and must be modeled, not assumed. A cache time-to-live that is too short forces repeated writes for a prefix reused often enough to have paid off with a longer TTL, and low-frequency, small-prefix requests are exactly where write overhead can exceed savings.
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