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---
name: ztc-product-configurator-preview-performance
description: "Focused implementation and verification of preview performance in Interactive Product Configurator."
---
# Preview Performance
Parent: `ztc-product-configurator` — read its acceptance gate and `../../src/configurator.mjs` before editing.
## Required implementation
Warm reusable textures where appropriate, cancel stale loads and release replaced GPU assets.
### Exact workflow
1. Inspect current code ownership and versions; write down the affected components, selectors, assets and timeline owners.
2. Reproduce baseline at 320px/390px/768px/1440px, with pointer/touch, navigation, RTL if applicable, and reduced-motion.
3. Integrate the smallest change confined to this responsibility. Use typed/validated props and explicit lifecycle cleanup. Ensure failed assets, missing browser APIs and aborted interactions degrade gracefully.
4. Instrument observable state (progress, time, active selection, DOMRect, material parameters or frame index). Avoid non-deterministic quality claims.
5. Verify start, mid, end and reverse progress; resize after loading fonts/images; test one failure path and repeated navigation; inspect browser console and screenshots.
6. Compare user-facing behavior and performance to baseline. If a regression is observed, roll back just this change and record the cause.
## Contract
- **Input:** authenticated/validated application state, viewport, user preference, and dependencies explicitly available in target project.
- **Output:** meaningful accessible DOM and stable optional visual enhancement; no hidden input-only navigation.
- **Acceptance:** Reject invalid option combinations; valid update/undo/URL restore work; preview remains correct after rapid selection and mobile orientation change.
- **Limitations:** No payment, price truth or stock verification is implemented by this local preview module.
- **Evidence:** file paths, screenshot artifact paths, browser/driver, commands, actual test results, and unresolved TODOs.
## References
- https://threejs.org/docs/pages/GLTFLoader.html
