Reuse formatted job data only while its inputs remain unchanged
Date and duration formatting dominates repeated filters. A broad memoization patch reuses labels after the schedule time zone changes.
- Focused work estimate
- 3h + prerequisites
- Priority in the scenario
- Medium
- Engineering practice
- Memoization · Invalidation
Estimated field mix
- Performance engineering60%
- Frontend40%
Field percentages are editorial estimates of the ticket's engineering focus. They total 100%; they are not measured time, proficiency scores, or ownership evidence.
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Project context
A fictional repair coordinator opens a week containing 2,000 jobs. The initial page loads, but filtering and selecting a job can freeze the interface. Build a synthetic scheduling screen with keyboard operation before measuring changes.
Setup prerequisites
- Create a local schedule UI with 2,000 synthetic jobs, long labels, empty results and deterministic responses.
- Record browser version, viewport, device emulation, CPU/network throttling and build mode for every comparison.
Preceding work
Complete these dependencies, or supply their agreed outputs before taking this ticket.
Acceptance criteria
- Cache or precompute expensive formatting with all relevant inputs, including locale and time zone, in the invalidation rule.
- Bound retained derived data and remove entries for jobs no longer present.
- Keep visible labels identical to the uncached formatter across updates and daylight-saving boundary fixtures.
Implementation constraints
- Measure formatting calls and interaction time together; memoization alone is not evidence of a useful improvement.
Verification to include
- Change the time zone and job start time independently, comparing every visible label with the baseline formatter.
- Replace the dataset repeatedly and check that retained derived entries stay within the declared bound.
Deliverables
- Derived-data cache, invalidation regressions and profiling comparison
Rollout and recovery
Disable derived-data reuse through one path if stale labels appear; the original formatter remains the reference behavior.
Value of the work
For the engineer: Connect bundle, rendering and interaction measurements to user-visible behavior without losing accessibility.
For the team: Produce a bounded performance investigation and regression workflow for dense operational interfaces.
Evidence boundaries
Outcome Evidence: Tests, patches, and runbooks are requested deliverables. They become Outcome Evidence only through a qualified Mission and immutable Evidence IDs.
Ownership Evidence: Independent adaptation must be observed under a declared verification policy and cite immutable Evidence IDs. Completing a planning ticket establishes no Ownership Evidence.