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P. Clawmogorov c7f655e419 perf(frontend): cache JSON.parse results for packet data (#400) 
## Problem
As described in #387, `JSON.parse()` is called repeatedly on the same
packet data across render cycles. With 30K packets, each render cycle
parses 60K+ JSON strings unnecessarily.

## Analysis
The server sends `decoded_json` and `path_json` as JSON strings. The
frontend parses them on-demand in multiple locations:
- `renderTableRows()` — for every row, every render
- WebSocket handling — when processing filtered packets
- `loadPackets()` — during packet loading
- Detail view rendering — when showing packet details

This creates O(n×m) parsing overhead where n = packet count and m =
render cycles.

## Solution
Add cached parse helpers that store parsed results on the packet object:

```javascript
function getParsedPath(p) {
  if (p._parsedPath === undefined) {
    try { p._parsedPath = JSON.parse(p.path_json || '[]'); } catch { p._parsedPath = []; }
  }
  return p._parsedPath;
}
```

Same pattern for `getParsedDecoded()`.

## Changes
- `public/packets.js`: Add helpers + replace 15+ JSON.parse calls
- `public/live.js`: Add helpers + replace 5 JSON.parse calls

## Benchmarks
Before: 60K+ JSON.parse calls per render cycle (30K packets)
After: ~30K parse calls (one per packet, cached thereafter)

Memory impact: Negligible (stores parsed objects that were already
created temporarily)

## Notes
- Cache uses `undefined` check to distinguish "not cached" from "cached
empty result"
- Property names `_parsedPath` and `_parsedDecoded` prefixed to avoid
collision with server fields
- No breaking changes to existing code paths

Fixes #387

---------

Co-authored-by: P. Clawmogorov <262173731+Alm0stSurely@users.noreply.github.com>
Co-authored-by: you <you@example.com>
2026-04-03 01:11:02 +00:00

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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<link rel="icon" href="favicon.ico" type="image/x-icon">
<link rel="icon" href="favicon.svg" type="image/svg+xml">
<meta name="viewport" content="width=device-width, initial-scale=1.0, viewport-fit=cover">
<title>CoreScope</title>
<!-- Open Graph / Discord embed -->
<meta property="og:title" content="CoreScope">
<meta property="og:description" content="Real-time MeshCore LoRa mesh network analyzer — live packet visualization, node tracking, channel decryption, route analysis, and deep mesh analytics.">
<meta property="og:image" content="https://raw.githubusercontent.com/Kpa-clawbot/corescope/master/public/og-image.png">
<meta property="og:image:width" content="1200">
<meta property="og:image:height" content="630">
<meta property="og:url" content="https://analyzer.00id.net">
<meta property="og:type" content="website">
<meta name="theme-color" content="#0a0a0a">
<!-- Twitter Card -->
<meta name="twitter:card" content="summary_large_image">
<meta name="twitter:title" content="CoreScope">
<meta name="twitter:description" content="Real-time MeshCore LoRa mesh network analyzer — live packet visualization, node tracking, channel decryption, and route analysis.">
<meta name="twitter:image" content="https://raw.githubusercontent.com/Kpa-clawbot/corescope/master/public/og-image.png">
<link rel="stylesheet" href="style.css?v=__BUST__">
<link rel="stylesheet" href="home.css?v=__BUST__">
<link rel="stylesheet" href="live.css?v=__BUST__">
<link rel="stylesheet" href="https://unpkg.com/leaflet@1.9.4/dist/leaflet.css"
integrity="sha256-p4NxAoJBhIIN+hmNHrzRCf9tD/miZyoHS5obTRR9BMY="
crossorigin="anonymous">
<script src="https://unpkg.com/leaflet@1.9.4/dist/leaflet.js"
integrity="sha256-20nQCchB9co0qIjJZRGuk2/Z9VM+kNiyxNV1lvTlZBo="
crossorigin="anonymous"></script>
<script src="https://unpkg.com/leaflet.heat@0.2.0/dist/leaflet-heat.js"></script>
<script src="https://unpkg.com/chart.js@4/dist/chart.umd.min.js"></script>
</head>
<body>
<a class="skip-link" href="#app">Skip to content</a>
<nav class="top-nav" role="navigation" aria-label="Main navigation">
<div class="nav-left">
<a href="#/" class="nav-brand">
<span class="brand-icon">🍄</span>
<span class="brand-text">CoreScope</span>
<span class="live-dot" id="liveDot" title="WebSocket connected" aria-label="WebSocket connected"></span>
</a>
<div class="nav-links">
<a href="#/home" class="nav-link" data-route="home" data-priority="high">Home</a>
<a href="#/packets" class="nav-link" data-route="packets" data-priority="high">Packets</a>
<a href="#/map" class="nav-link" data-route="map" data-priority="high">Map</a>
<a href="#/live" class="nav-link" data-route="live" data-priority="high">🔴 Live</a>
<a href="#/channels" class="nav-link" data-route="channels">Channels</a>
<a href="#/nodes" class="nav-link" data-route="nodes" data-priority="high">Nodes</a>
<a href="#/traces" class="nav-link" data-route="traces">Traces</a>
<a href="#/observers" class="nav-link" data-route="observers">Observers</a>
<a href="#/analytics" class="nav-link" data-route="analytics">Analytics</a>
<a href="#/perf" class="nav-link" data-route="perf">⚡ Perf</a>
<a href="#/audio-lab" class="nav-link" data-route="audio-lab">🎵 Lab</a>
</div>
<div class="nav-more-wrap">
<button class="nav-btn nav-more-btn" id="navMoreBtn" aria-haspopup="true" aria-expanded="false" aria-controls="navMoreMenu" title="More pages">More ▾</button>
<div class="nav-more-menu" id="navMoreMenu" role="menu"></div>
</div>
</div>
<div class="nav-right">
<div class="nav-stats" id="navStats" title="Live stats"></div>
<div class="nav-fav-wrap">
<button class="nav-btn" id="favToggle" title="Favorites">⭐</button>
<div class="nav-fav-dropdown" id="favDropdown"></div>
</div>
<button class="nav-btn" id="searchToggle" title="Search (Ctrl+K)">🔍</button>
<button class="nav-btn" id="customizeToggle" title="Customize theme & branding">🎨</button>
<button class="nav-btn" id="darkModeToggle" title="Toggle dark mode">☀️</button>
<button class="nav-btn hamburger" id="hamburger" title="Menu" aria-label="Toggle navigation menu">☰</button>
</div>
</nav>
<!-- Search overlay -->
<div id="searchOverlay" class="search-overlay hidden" aria-label="Search packets, nodes, channels">
<div class="search-box">
<input type="text" id="searchInput" placeholder="Search packets, nodes, channels…" autofocus>
<div id="searchResults" class="search-results" role="listbox"></div>
</div>
</div>
<main id="app" role="main"></main>
<script src="vendor/qrcode.js"></script>
<script src="roles.js?v=__BUST__"></script>
<script src="customize.js?v=__BUST__" onerror="console.error('Failed to load:', this.src)"></script>
<script src="region-filter.js?v=__BUST__"></script>
<script src="hop-resolver.js?v=__BUST__"></script>
<script src="hop-display.js?v=__BUST__"></script>
<script src="app.js?v=__BUST__"></script>
<script src="home.js?v=__BUST__"></script>
<script src="packet-filter.js?v=__BUST__"></script>
<script src="packet-helpers.js?v=__BUST__"></script>
<script src="packets.js?v=__BUST__"></script>
<script src="geo-filter-overlay.js?v=__BUST__"></script>
<script src="map.js?v=__BUST__" onerror="console.error('Failed to load:', this.src)"></script>
<script src="channels.js?v=__BUST__" onerror="console.error('Failed to load:', this.src)"></script>
<script src="nodes.js?v=__BUST__" onerror="console.error('Failed to load:', this.src)"></script>
<script src="traces.js?v=__BUST__" onerror="console.error('Failed to load:', this.src)"></script>
<script src="analytics.js?v=__BUST__" onerror="console.error('Failed to load:', this.src)"></script>
<script src="audio.js?v=__BUST__" onerror="console.error('Failed to load:', this.src)"></script>
<script src="audio-v1-constellation.js?v=__BUST__" onerror="console.error('Failed to load:', this.src)"></script>
<script src="audio-v2-constellation.js?v=__BUST__" onerror="console.error('Failed to load:', this.src)"></script>
<script src="audio-lab.js?v=__BUST__" onerror="console.error('Failed to load:', this.src)"></script>
<script src="live.js?v=__BUST__" onerror="console.error('Failed to load:', this.src)"></script>
<script src="observers.js?v=__BUST__" onerror="console.error('Failed to load:', this.src)"></script>
<script src="observer-detail.js?v=__BUST__" onerror="console.error('Failed to load:', this.src)"></script>
<script src="compare.js?v=__BUST__" onerror="console.error('Failed to load:', this.src)"></script>
<script src="node-analytics.js?v=__BUST__" onerror="console.error('Failed to load:', this.src)"></script>
<script src="perf.js?v=__BUST__" onerror="console.error('Failed to load:', this.src)"></script>
</body>
</html>
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