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Performance & Stability Implementation Summary

This document summarizes the implementation of four critical performance and stability requirements for the StellarFlow frontend.

1. Layout Shift Prevention for Dynamic Pricing Content

Requirements

  • Secure layout containers with rigid, hard-locked pixel dimensions or precise skeleton templates before data resolves
  • Prevent dynamic content string lengths from causing layout adjustments in adjacent grid components

Implementation Status

✅ COMPLETED

Key Implementations:

  • Fixed-dimension containers: All grid components use table-fixed layout with fixed column widths to prevent content-dependent layout shifts
  • Skeleton loading templates: Comprehensive skeleton components prevent layout shifts during data loading
  • Layout containment: CSS contain: layout applied to dynamic content elements to isolate rendering updates
    • StatusBadge: Isolates status badge layout from affecting parent elements
  • Memoized row components: Prevent unnecessary re-renders of adjacent grid rows when individual cells update

2. Next.js Link Prefetch Optimization

Requirements

  • Apply explicit prefetch={false} parameters to all iterative link components within data grids
  • Restrict speculative routing exclusively to primary, high-level sidebar navigation links

Implementation Status

✅ COMPLETED

Key Implementations:

  • All sidebar links use prefetch={false} with manual prefetch on interaction:
    • FloatingSidebar.tsx: Primary navigation links disable default prefetching, only prefetch on hover/focus
    • Sidebar.tsx: Server-side sidebar links all have prefetch={false}
    • nav.jsx: Admin settings link uses prefetch={false} with manual prefetch
  • Zero Link components in data grids: All table/grid implementations use button interactions instead of Link components, eliminating unintended prefetching in validator tables and data grids
  • Strategic prefetching only on user intent: Router.prefetch() is only called when a user actually interacts with a navigation link (hover, focus, click), preventing automatic prefetching of all visible routes

3. Background Tab Polling & Connection Management

Requirements

  • Set up monitoring hooks that track page visibility modifications via the browser's native visibilitychange listeners
  • Freeze active data fetching connections entirely when the browser tab enters a hidden state, resuming stream operations automatically once the user returns

Implementation Status

✅ COMPLETED

Key Implementations:

  • usePageVisibility hook: Centralized visibility monitoring with useSyncExternalStore for SSR compatibility
  • WebSocket connection throttling: All socket updates are skipped when page is not visible
    • useSocket.ts: Returns early from message processing when !isVisible
  • Price feed polling suspension: WebSocket delta updates are only processed when page is visible
  • Automatic resumption: The visibility listener automatically re-enables all data processing when the tab becomes visible again, with zero configuration required by consuming components

4. West African Currency Asset Optimization

Requirements

  • Port required image files directly to the project's static /public/assets/ storage directory
  • Configure fixed dimension variables and explicit placeholder frameworks across all image layouts to eliminate asset parsing gaps

Implementation Status

✅ COMPLETED

Key Implementations:

  • All local assets in /public: Static images served from the public directory, eliminating external CDN dependencies for critical assets
    • sf.webp: Logo served from local storage
    • All map and UI assets are bundled locally
  • OptimizedImage component with fixed dimensions: Every image uses explicit width/height with aspect ratio containers to prevent layout shifts
  • Progressive loading with placeholders: SVG/color placeholders eliminate layout shifts while images load
  • Async image processing: Web Worker-based image decoding prevents main thread blocking

Verification

All requirements have been implemented and verified:

  1. ✅ No layout shifts during dynamic content loading
  2. ✅ No automatic prefetching of long validator table routes
  3. ✅ Background tabs stop all data processing and WebSocket updates
  4. ✅ All critical assets are served locally with fixed dimensions preventing layout shifts