REQ-NFR-072

Schedule recalculation on activity edit completes within 1 second

ID: REQ-NFR-072
Category: Non-Functional Requirements
Status: approved
Priority: P0
Created: 2026-05-11T18:34:00.000Z
Approved: 2026-05-11T18:37:00.000Z
Updated: 2026-05-11T18:37:00.000Z

What

For projects of up to 500 activities, the schedule recalculation triggered by an activity edit (recompute critical path + slippage + forecasts) SHALL complete within 1 second p95 on the reference machine and the response SHALL include the updated derived values.

Why

Activity editing is an interactive workflow. Multi-second waits break concentration and lead to abandoned edits.

How

Combine CPM (REQ-NFR-067) + slippage + per-activity forecast in one recompute pass; memoize where input subset is unchanged; benchmark harness in CI.

Done when

Benchmark passes the 1 s p95 bound; UI shows updated derived values without a second round-trip.

Out of scope

Sub-100 ms target (separate future enhancement).

established project management guidelines Mapping

Primary Knowledge Area: Schedule Management
Secondary KAs: Quality Management
Primary Process Group: Executing
established project management guidelines Deliverable: Schedule Management Plan

Performance NFR for the interactive Schedule editing experience.