Performance
· 23 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.Performance-focused optimization plan with CWV assessment, top offenders, and time estimates
First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.
594 ms
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
1.15 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
17 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.010
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
1.58 s
Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.
1.30 s
Page Load Progression
FPage Weight BudgetAction5.6 MB transferred, 68 requestsFIX
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.
Source: web.dev
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
JavaScript bundle is large — code-split routes and lazy-load off-screen components to defer.
Source: web.dev
DThird-Party ImpactAction82% third-party, 0 ms blockingFIX
DPage Weight InventoryAction68 resources · 5.6 MB · 122 KB savings availableFIX
~121.7 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 68 resources | 5.6 MiB | ||||||
DHTTP CachingActionno-store (uncacheable)FIX
private, no-cache, no-store, max-age=0, must-revalidate
| Directive | Value | Meaning |
|---|---|---|
| private | — | Only browser cache, not CDN/proxy |
| no-cache | — | Cache but always revalidate first |
| no-store | — | Never cache this response |
| max-age | 0 | Cache for 0 seconds |
| must-revalidate | — | Must recheck with server after expiry |
BImage Optimization16 images, 0 KB saveableREVIEW
Set explicit width and height to prevent CLS.
Performance issues directly impact user engagement and conversion rates.
CJS Execution CostAction1059ms total JS executionREVIEW
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.discoveryworldtrekking.com/ | 484ms | 4ms | 3ms | 1st |
| https://www.discoveryworldtrekking.com/_next/static/immutable/chunks/1bntt6rfidl88.js | 379ms | 235ms | 5ms | 1st |
| Unattributable | 145ms | 3ms | 0ms | 1st |
| https://www.discoveryworldtrekking.com/_next/static/immutable/chunks/turbopack-1byz1flvc-bu1.js | 51ms | 51ms | 0ms | 1st |
BJS Bundles37 scripts, 122 KB unusedREVIEW
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.discoveryworldtrekking.com/_next/static/immutable/chunks/35o4yz3uhap26.js | 83 KB | 44 KB (54%) | ✓ | 1st |
| https://www.discoveryworldtrekking.com/_next/static/immutable/chunks/3lsc2esaj2e-a.js | 39 KB | 33 KB (89%) | ✓ | 1st |
| https://www.discoveryworldtrekking.com/_next/static/immutable/chunks/2g5tixr64y0aq.js | 48 KB | 24 KB (51%) | ✓ | 1st |
| https://www.discoveryworldtrekking.com/_next/static/immutable/chunks/1bntt6rfidl88.js | 65 KB | 21 KB (32%) | ✓ | 1st |
| https://www.discoveryworldtrekking.com/_next/static/immutable/chunks/29fag-hauha21.js | 7 KB | — | ✓ | 1st |
| https://www.discoveryworldtrekking.com/_next/static/immutable/chunks/16b65hb2_ijv4.js | 1 KB | — | ✓ | 1st |
| https://www.discoveryworldtrekking.com/_next/static/immutable/chunks/21bj34l-3lx-c.js | 12 KB | — | ✓ | 1st |
| https://www.discoveryworldtrekking.com/_next/static/immutable/chunks/38kes2bm6p4ga.js | 11 KB | — | ✓ | 1st |
| https://www.discoveryworldtrekking.com/_next/static/immutable/chunks/3q-rnd9s72e5q.js | 12 KB | — | ✓ | 1st |
| https://www.discoveryworldtrekking.com/_next/static/immutable/chunks/3pqpz6f2lo1_8.js | 11 KB | — | ✓ | 1st |
Consider code splitting or tree shaking to reduce unused code.
This bundle has high unused code — code-split or tree-shake to ship only what executes.
Source: web.dev / Lighthouse coverage
Consider code splitting or tree shaking to reduce unused code.
This bundle has high unused code — code-split or tree-shake to ship only what executes.
Source: web.dev / Lighthouse coverage
Consider code splitting or tree shaking to reduce unused code.
This bundle has high unused code — code-split or tree-shake to ship only what executes.
Source: web.dev / Lighthouse coverage
Consider code splitting or tree shaking to reduce unused code.
This bundle has high unused code — code-split or tree-shake to ship only what executes.
Source: web.dev / Lighthouse coverage
BHTTP/3 (QUIC)HTTP/3 not advertisedREVIEW
BServer-Timing ObservabilityNo Server-Timing header foundREVIEW
CGreen HostingActionWhether the site is served from green-energy infrastructureREVIEW
Green Hosting
No green hosting detected
A+Text CompressionAll text resources are compressedPASS
A+Font Loading2 fonts (199 KB)PASS
Web fonts
2
199 KB total
Render-blocking
0
of 2
Dominant font-display
swap
Most common across fonts
Font loading timeline
- Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
Optimization checklist
- Preload critical fonts (priority=high)
- Use woff2 format for all fonts
- Set font-display to swap, optional, or fallback
- Subset large fonts (≤100 KB each)
Fixing the unchecked items could save ~56 KB and ~112 ms
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource HintsNo optimization neededPASS
A+Document CompressionDocument response uses brotliPASS
AAsset Compression1 of 1 asset host still on gzipPASS
A+LCP Image PreloadLCP preload audit not availablePASS
A+Main HTML Cache-ControlMain HTML uses no-store -- correct for sensitive/dynamic contentPASS
A+Server Response Intelligence2 server-response signal(s) detectedPASS
Network Waterfall68 requests over 1291msINFO
Real-User Performance (CrUX)Field metrics from the Chrome User Experience ReportINFO
Chrome User Experience (CrUX)
Real-user metrics from the Chrome UX Report (2026-09-30 — 2026-10-27)
LCP (p75)
2748 ms
69% good
INP (p75)
130 ms
88% good
CLS (p75)
0.030
91% good
FCP (p75)
2102 ms
TTFB (p75)
605 ms
Image Optimization29 images, 105 KB total, 0 KB wastedINFO
Image Optimization Audit
Total Images
29
Total Size
105 KB
Oversized
1