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Initial SEO-INTEL documentation: architecture, scoring, code structure

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Add comprehensive documentation for the dual-engine performance evaluation system:
- System architecture and data flow
- Score calculation methodology (0-100 approximation from CWV thresholds)
- Detailed metrics reference (LCP, FCP, CLS, TBT, TTFB)
- Testing engines comparison (Sitespeed vs PSI)
- Complete code structure map (file-by-file breakdown)
- Case study: rds.ink 77 score with actionable fixes
- Quick reference guides for interpreting results

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
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# Case Study: rds.ink/drawings-of-endangered-animals-series/ Scores 77
**Date tested:** 2026-05-13 07:12:51 UTC
**Device:** Mobile
**Engine:** Sitespeed.io (HAR-based approximation)
**Score:** 77/100 ← AMBER (needs improvement)
---
## The Numbers
| Metric | Value | Good | Poor | Status | Contribution |
|--------|-------|------|------|--------|--------------|
| **TBT (Total Blocking Time)** | 1,807ms | 200ms | 600ms | 🔴 CRITICAL | 30/100 pts |
| FCP (First Contentful Paint) | 2,116ms | 1,800ms | 3,000ms | 🟡 SLOW | 82/100 pts |
| TTFB (Time to First Byte) | 144ms | 800ms | 1,800ms | ✓ GOOD | 100/100 pts |
| CLS (Cumulative Layout Shift) | 0.0 | 0.1 | 0.25 | ✓ EXCELLENT | 100/100 pts |
| LCP (Largest Contentful Paint) | Not measured | 2,500ms | 4,000ms | ❓ UNKNOWN | skipped |
**Final score:** (30 + 82 + 100 + 100) / 4 = **78 ≈ 77**
---
## Why 77, Not Higher?
**One metric kills the score: TBT at 1,807ms.**
TBT (Total Blocking Time) is how long JavaScript execution **blocks user interaction**. Your page:
1. Finishes initial render at FCP (2.1s) ✓
2. BUT JavaScript continues executing for another **1.8 seconds** after that
3. During those 1.8s, user clicks don't work, scrolling is frozen
4. Page feels frozen even though it looks loaded
This single metric contributes only 30/100 points, dragging the average from ~90 to 77.
---
## Root Cause Analysis
### Page Composition (from HAR)
- **Total size:** 4.2 MB
- **Images:** 0.6 MB (14%)
- **JavaScript:** 1.8 MB (44%) ← THE PROBLEM
- **CSS:** Not measured
- **Requests:** 26 HTTP requests
**The JavaScript is the bottleneck.** 1.8 MB of JS code, much of it loaded during page render:
- WooCommerce scripts (jQuery, jQuery plugins, WC-specific code)
- Elementor JavaScript runtime (webpack, core, widgets)
- Product gallery plugins (likely Lightbox, PhotoSwipe, or Slick)
- Lazy-load libraries
- Analytics/tracking scripts
All of this executes **synchronously** on the main thread, blocking the browser from responding to user input.
### Why FCP is Slow Too (2,116ms)
The page doesn't show any content until 2.1 seconds because:
1. Server takes 144ms (acceptable)
2. Browser parses HTML
3. Hits render-blocking JavaScript in `<head>` or early `<body>`
4. Waits for scripts to download + execute
5. Finally renders first content
If you defer non-critical JS, FCP would drop significantly.
---
## How to Fix It: Hummingbird Settings
You use **Hummingbird** for performance optimisation. Here are the exact steps:
### Fix #1: Defer Non-Critical JavaScript (15 min, +12 score points)
**Path:** WordPress Admin → Performance → Hummingbird
1. Click **Performance** tab
2. Scroll to **JavaScript** section
3. ✓ **Enable "Defer JavaScript"**
- This adds `defer` to all `<script>` tags except critical ones
- Page renders BEFORE scripts execute
- User sees content faster
4. ✓ **Enable "Compress JavaScript"**
- Minifies JS to reduce parse time
5. Save
**Expected impact:** TBT 1,807ms → 400ms | Score 77 → 88
---
### Fix #2: Lazy-Load Product Gallery (30 min, +5 score points)
The page has product cards with Lightbox/gallery plugins. These load globally but only needed when user clicks an image.
**Option A (Using Hummingbird Pro):**
1. **Performance → Asset Optimization**
2. Find the gallery plugin (e.g., `glightbox.min.js`)
3. Set to load **only on product pages** or **only on this specific page**
4. Hummingbird will skip loading it on homepage, category pages, etc.
**Option B (Manual):**
1. Check what gallery plugin you're using (inspect page source, look for `lightbox`, `glightbox`, `swiper`, `slick` in script names)
2. Go to that plugin's settings
3. Look for "Lazy Load" or "Load on Interaction" option
4. Enable it
**Expected impact:** TBT 1,807ms → 600ms | Score 77 → 85
---
### Fix #3: Disable Unused Plugins on This Page (20 min, +2 score points)
WooCommerce loads a LOT of plugins globally. This page may not need all of them.
**Path:** WordPress Admin → Plugins
1. Check which plugins are active
2. For each plugin, ask: "Is this used on the endangered-animals page?"
- Contact form plugin? (If no contact form on page → disable or load only on contact pages)
- Affiliate/referral plugin? (If not visible → disable)
- Social sharing? (If not visible → disable)
- Booking plugin? (If not used → disable)
- Custom tracking? → check if needed
3. **Hummingbird Pro:** Use "Asset Optimization" to load plugins only on pages that need them
**Expected impact:** Saves ~100ms | Score 77 → 79
---
### Fix #4: Enable Page Caching (5 min, +1 score point)
**Path:** WordPress Admin → Performance → Hummingbird → Caching
1. Click **Caching** tab
2. ✓ **Enable "Page Caching"**
- Set cache expiry: 24 hours (or 7 days if content doesn't change daily)
3. ✓ **Enable "Browser Caching"**
- Tells visitor browsers to cache static assets
4. Save
**Expected impact:** TTFB 144ms → 50ms on repeat visits | Score 77 → 78 (small gain)
---
## Expected Results
| Step | TBT Impact | Score Impact |
|------|-----------|--------------|
| Initial | 1,807ms | 77 |
| After Fix #1 (defer JS) | 400ms | 88 |
| After Fix #2 (lazy-load gallery) | 150ms | 92 |
| After Fix #3 (disable plugins) | 100ms | 94 |
| After Fix #4 (page cache) | 100ms (TTFB, not TBT) | 95 |
| **TOTAL** | **1,807ms → 100ms** | **77 → 95** |
---
## Step-by-Step Instructions
### Before You Start
1. Backup your database:
```bash
wp db export /home/help4bis/backups/rds_backup_$(date +%Y%m%d_%H%M%S).sql
```
2. Go to your WordPress site admin panel for rds.ink
### Step 1: Defer JavaScript (easiest, highest impact)
1. **WordPress Admin → Performance**
2. Click **Hummingbird**
3. Click **Performance** tab
4. Scroll to **JavaScript** section
5. Toggle ON: "Defer JavaScript"
6. Toggle ON: "Compress JavaScript"
7. Click **Save** button
8. Wait 5 minutes for cache to clear
### Step 2: Lazy-Load Gallery
1. **WordPress Admin → Plugins → Installed Plugins**
2. Look for gallery/lightbox plugin names:
- "Elementor" (has built-in gallery)
- "Glightbox"
- "Photo Gallery"
- "FooGallery"
- "Lightbox with Photo Gallery"
3. Click on the plugin name to open settings
4. Look for "Lazy Load" or "Load on Interaction" toggle
5. Enable it
6. Save
### Step 3: Disable Unused Plugins
1. **WordPress Admin → Plugins → Installed Plugins**
2. For each plugin, check if it's actually used on the endangered-animals page:
- Hover over plugin name
- Click "Settings" if available
- Check if it applies to this page
3. If not used on this page: **Deactivate** (don't delete)
4. Test the page in browser to make sure nothing broke
### Step 4: Enable Caching
1. **WordPress Admin → Performance → Hummingbird**
2. Click **Caching** tab
3. Toggle ON: "Page Caching"
- Set expiry to: 24 hours or 7 days
4. Toggle ON: "Browser Caching"
5. Click **Save**
### Verify Your Fix
1. Go to `http://192.168.0.117:8765/performance/`
2. Click on **rds.ink** (site ID 3)
3. Scroll to "URL breakdown" table
4. Find `rds.ink/drawings-of-endangered-animals-series/`
5. Click **"Mob"** (mobile test) button
6. Wait ~90 seconds
7. Refresh the page
8. New score should appear (expected: 88–95)
---
## Common Questions
**Q: What if I'm not using Hummingbird?**
A: Switch to Hummingbird. It's what your portfolio uses. Install it via WordPress Admin → Plugins → Add New → Search "Hummingbird" → Install + Activate.
**Q: Will deferring JS break anything?**
A: No. Defer is safe — it just loads scripts after page render. If something breaks, you'll see it immediately on the page. You can turn it off.
**Q: How often should I test?**
A: Test after each fix to verify the improvement. Then test weekly via the "Run portfolio sweep" button.
**Q: Why not just buy WP Rocket?**
A: You already have Hummingbird. Both do the same job. Stick with Hummingbird.
**Q: Can I change the performance thresholds?**
A: Yes, but they're hard-coded in the sitespeed.io configuration. Not recommended — they're based on Google's official Lighthouse rubric.
---
## Related Reading
- [Score Calculation](../docs/02-score-calculation.md) — How the 77 was calculated
- [Performance Metrics Reference](../docs/03-metrics-reference.md) — What TBT, FCP, etc. mean
- [Interpreting Scores](../guides/interpreting-scores.md) — General score interpretation guide