perf: cache formatted date strings in EmailListScreen (P5) #51

2026-05-14T09:17:20Z

guettlibot commented

2026-05-14 09:17:20 +00:00

(Migrated from codeberg.org)

Summary

Add a module-level Map<int, String> that memoises DateFormat.format() keyed by local calendar day
In a 50-item list where many emails share the same date (e.g. all of today's mail), reduces format() calls from O(n) per rebuild to O(distinct days)
Zero overhead for emails with a plain-text body (cache hit after the first call per day)

Test plan

Existing widget tests pass unchanged
task check-fast green

🤖 Generated with Claude Code

## Summary - Add a module-level `Map<int, String>` that memoises `DateFormat.format()` keyed by local calendar day - In a 50-item list where many emails share the same date (e.g. all of today's mail), reduces `format()` calls from O(n) per rebuild to O(distinct days) - Zero overhead for emails with a plain-text body (cache hit after the first call per day) ## Test plan - [x] Existing widget tests pass unchanged - [x] `task check-fast` green 🤖 Generated with [Claude Code](https://claude.com/claude-code)

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Reference: guettli/sharedinbox#51