https://www.discoveryworldtrekking.com
Performance
· 27 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.SCORE
85
GRADE
B
FIX
2
REVIEW
8
PASS
14
INFO
3
Performance-focused optimization plan with CWV assessment, top offenders, and time estimates
80
100
100
100
First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.
1.24 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
4.24 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
282 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.014
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
2.74 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.
7.25 s
Page Load Progression
Checks
2714 PASS 8 REVIEW 2 FIX
FJS Execution CostAction4992ms total JS executionFIX
JS Execution Cost
Action4992ms total JS execution
4992ms total JS execution
Warning::
https://www.discoveryworldtrekking.com/: 2661ms CPU time
Warning::
https://www.discoveryworldtrekking.com/_next/stati...: 1475ms CPU time
Warning::
Unattributable: 404ms CPU time
Warning::
https://www.discoveryworldtrekking.com/_next/stati...: 274ms CPU time
Info::
https://www.discoveryworldtrekking.com/_next/stati...: 67ms CPU time
Main Thread Breakdown
Other 38% Script Evaluation 26% Style & Layout 16% Rendering 14%
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.discoveryworldtrekking.com/ | 2661ms | 13ms | 9ms | 1st |
| https://www.discoveryworldtrekking.com/_next/static/immutable/chunks/1bntt6rfidl88.js | 1475ms | 901ms | 14ms | 1st |
| Unattributable | 404ms | 12ms | 0ms | 1st |
| https://www.discoveryworldtrekking.com/_next/static/immutable/chunks/36sdvupvrg2xa.js | 274ms | 254ms | 10ms | 1st |
| https://www.discoveryworldtrekking.com/_next/static/immutable/chunks/38kes2bm6p4ga.js | 67ms | 3ms | 3ms | 1st |
| https://www.discoveryworldtrekking.com/_next/static/immutable/chunks/3e5_obrl4ywlc.js | 60ms | 47ms | 7ms | 1st |
| https://www.discoveryworldtrekking.com/_next/static/immutable/chunks/26skjm5y_qdlo.js | 50ms | 16ms | 7ms | 1st |
DHTTP CachingActionno-store (uncacheable)FIX
HTTP Caching
Actionno-store (uncacheable)
no-store (uncacheable)
Info::
Cache-Control: no-store prevents all caching
Intentional for dynamic content, but increases server load for every page view.
Got: private, no-cache, no-store, max-age=0, must-revalidate
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control
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 |
BPage Weight Budget1.4 MB transferred, 60 requestsREVIEW
Page Weight Budget
1.4 MB transferred, 60 requests
1.4 MB transferred, 60 requests
Info::
Page weighs 3.0 MB (1.4 MB transferred)
Warning::
JavaScript is 581 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 581 KB
Info::
60 HTTP requests
Info::
Estimated 0.30 g CO2 per page load
1.4 MB transferred
60 requests
0.30 g CO2 per page load
JavaScript 580.6 KiB 39%
Images 545.6 KiB 37%
Fonts 198.8 KiB 13%
HTML 71.0 KiB 5%
Other 59.6 KiB 4%
CSS 14.2 KiB 1%
Other 3.7 KiB 0%
0 2.4 MB 4.9 MB
Under budget
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Why this matters
JavaScript bundle is large — code-split routes and lazy-load off-screen components to defer.
Source: web.dev
BImage Optimization11 images, 0 KB saveableREVIEW
Image Optimization
11 images, 0 KB saveable
11 images, 0 KB saveable
Warning::
is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
11 images 546 KB
0 oversized -0 KB
4 legacy format
1 missing dimensions CLS risk
Set explicit width and height to prevent CLS.
Why this matters
Performance issues directly impact user engagement and conversion rates.
BJS Bundles37 scripts, 121 KB unusedREVIEW
JS Bundles
37 scripts, 121 KB unused
37 scripts, 121 KB unused
Warning::
https://www.discoveryworldtrekking.com/_next/stati...: 44 KB unused (54%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.discoveryworldtrekking.com/_next/stati...: 33 KB unused (89%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.discoveryworldtrekking.com/_next/stati...: 24 KB unused (51%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.discoveryworldtrekking.com/_next/stati...: 20 KB unused (31%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 121 KB
121 KB unused JavaScript
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 | 38 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 | 20 KB (31%) | ✓ | 1st |
| https://www.discoveryworldtrekking.com/_next/static/immutable/chunks/29fag-hauha21.js | 6 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.
Why this matters
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.
Why this matters
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.
Why this matters
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.
Why this matters
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
HTTP/3 (QUIC)
HTTP/3 not advertised
HTTP/3 not advertised
Info::
HTTP/3 (QUIC) is not advertised
HTTP/3 isn't advertised via Alt-Svc and the worker didn't negotiate h3. HTTP/3 reduces handshake latency (1-RTT instead of 2-3 RTTs) and is more resilient on lossy connections. Most modern CDNs (Cloudflare, Fastly, AWS CloudFront, Google Cloud CDN) support HTTP/3 with a single config switch -- consider enabling for mobile-heavy workloads.
BServer-Timing ObservabilityNo Server-Timing header foundREVIEW
Server-Timing Observability
No Server-Timing header found
No Server-Timing header found
Info::
No Server-Timing header found
Server-Timing exposes backend timing breakdowns to browser DevTools (e.g., `db: 45ms; render: 120ms; cache: 2ms`). Useful for diagnosing slow pages without backend log access. Most modern frameworks (Next.js, Cloudflare Workers, Fastly) emit it automatically; absence on a managed platform usually means telemetry headers are stripped at the edge.
CPage Weight InventoryAction60 resources · 1.4 MB · 121 KB savings availableREVIEW
Page Weight Inventory
Action60 resources · 1.4 MB · 121 KB savings available
60 resources · 1.4 MB · 121 KB savings available
Warning::
Page weight 1.4 MB exceeds 1 MB target by 449 KB
Got: 1.4 MB Expected: ≤ 1 MB
Info::
~121 KB of savings available
Info::
6 third-party resources (33% of weight)
60 resources · 1.4 MiB · 6 third-party 449.4 KiB over 1MB target
Image 41% · 605.2 KiB
JavaScript 39% · 580.6 KiB
Font 13% · 198.8 KiB
Document 5% · 71.0 KiB
CSS 1% · 14.2 KiB
Other 0% · 3.7 KiB
~121.4 KiB of savings available
Remove unused JavaScript: 121.4 KiB
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 60 resources | 1.4 MiB | ||||||
BJavaScript Blocking2 JS blocking issue(s) detectedREVIEW
JavaScript Blocking
2 JS blocking issue(s) detected
2 JS blocking issue(s) detected
Warning::
21 render-blocking <script src> tag(s) without async/defer
Each `<script src=...>` without `async`, `defer`, or `type="module"` blocks HTML parsing while the browser fetches and executes it. The block lasts the entire round-trip + execution time -- on slow networks this translates directly into LCP delay. Add `defer` (executes after parse, in source order) for scripts that interact with the DOM, or `async` (executes whenever ready) for analytics / independent scripts. Module scripts (`type="module"`) are deferred by default.
Warning::
Total JS execution time is 5.0 s -- over the 3.5s budget
Total JavaScript execution (parse + compile + run) across all scripts exceeds 3.5 seconds. On low-end devices that becomes 7-15+ seconds and shows up directly in TBT and INP. Reduce by: tree-shaking unused dependencies, code-splitting (dynamic `import()`), removing or deferring third-party tracking, and replacing heavy frameworks where they're not needed.
CGreen HostingActionWhether the site is served from green-energy infrastructureREVIEW
Green Hosting
ActionWhether the site is served from green-energy infrastructure
Green Hosting
No green hosting detected
AThird-Party Impact33% third-party, 0 ms blockingPASS
Third-Party Impact
33% third-party, 0 ms blocking
33% third-party, 0 ms blocking
Info::
Third-party code accounts for 33% of page weight (490.8 KiB of 1.4 MiB)
Info::
Third-party blocking time is low (0 ms)
67%
33%
First-party Third-party
A+Text CompressionAll text resources are compressedPASS
Text Compression
All text resources are compressed
All text resources are compressed
Info::
All text resources are compressed
All text resources are properly compressed.
A+Font Loading2 fonts (199 KB)PASS
Font Loading
2 fonts (199 KB)
2 fonts (199 KB)
Info::
2 font(s) use font-display: swap (FOUT risk but functional)
Web fonts
2
199 KB total
Render-blocking
0
of 2
Dominant font-display
swap
Most common across fonts
Font loading timeline
Transfer FOIT (block) FOUT (swap)
DMSans_Variable-s.p.435... woff2 swap
Size 88 KB
Load time 36 ms
Start 100 ms
Risk FOUT — text flashes from fallback to web font
DMSans_Italic_Variable.... woff2 swap
Size 110 KB
Load time 50 ms
Start 236 ms
Risk FOUT — text flashes from fallback to web font
- 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 ~55 KB and ~110 ms
A+Resource CachingAll resources properly cachedPASS
Resource Caching
All resources properly cached
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+Critical Rendering PathNo render-blocking resourcesPASS
Critical Rendering Path
No render-blocking resources
No render-blocking resources
Info::
No render-blocking resources detected
AResource Hints17 hints, 0 missing preconnectsPASS
Resource Hints
17 hints, 0 missing preconnects
17 hints, 0 missing preconnects
Info::
1 dns-prefetch redundant with preconnect on same origin
preconnect already does the DNS lookup; adding dns-prefetch to the same origin is at best a no-op. Sample: https://js.driftt.com. Remove the redundant dns-prefetch entries.
Info::
1 URL(s) appear in multiple hints
The same href shouldn't appear in multiple hint rels -- one wins, the others are wasted markup and may confuse cache behavior. Sample: https://js.driftt.com (dns-prefetch+preconnect).
Info::
Page uses 17 resource hint(s)
Current Resource Hints
preconnect 1
preload
+5
15dns-prefetch 1
prefetch—
17 resource hints configured
preconnect already does the DNS lookup; adding dns-prefetch to the same origin is at best a no-op. Sample: https://js.driftt.com. Remove the redundant dns-prefetch entries.
Why this matters
Performance issues directly impact user engagement and conversion rates.
The same href shouldn't appear in multiple hint rels -- one wins, the others are wasted markup and may confuse cache behavior. Sample: https://js.driftt.com (dns-prefetch+preconnect).
Why this matters
Performance issues directly impact user engagement and conversion rates.
A+Document CompressionDocument response uses brotliPASS
Document Compression
Document response uses brotli
Document response uses brotli
Info::
Main HTML response uses brotli (Content-Encoding: br)
Brotli is the best text-compression algorithm for general use, ~20% smaller than gzip on average (40% on smaller files). Modern browsers all support it.
AAsset Compression1 of 1 asset host still on gzipPASS
Asset Compression
1 of 1 asset host still on gzip
1 of 1 asset host still on gzip
Info::
cms.discoveryworldtrekking.com serves assets with gzip; brotli would be ~20% smaller (assets: 24)
Every current browser accepts brotli. On a CDN this is a per-pull-zone toggle (Cloudflare, Fastly, CloudFront, CDN77, Bunny all expose it); on an origin it needs the brotli module (nginx-brotli, Apache mod_brotli). The saving lands on the assets this host serves, not on the HTML document -- the document's own encoding is reported separately.
Got: cms.discoveryworldtrekking.com (image/svg+xml)
A+LCP Image PreloadLCP preload audit not availablePASS
LCP Image Preload
LCP preload audit not available
LCP preload audit not available
Info::
LCP image preload audit not available for this scan
A+Main HTML Cache-ControlMain HTML uses no-store -- correct for sensitive/dynamic contentPASS
Main HTML Cache-Control
Main HTML uses no-store -- correct for sensitive/dynamic content
Main HTML uses no-store -- correct for sensitive/dynamic content
Info::
Main HTML uses no-store -- correct for sensitive/dynamic content
Got: private, no-cache, no-store, max-age=0, must-revalidate
A+Server Response Intelligence2 server-response signal(s) detectedPASS
Server Response Intelligence
2 server-response signal(s) detected
2 server-response signal(s) detected
Info::
`Vary` header declared: rsc, next-router-state-tree, next-router-prefetch, next-router-segment-prefetch
The page declares a `Vary` header, telling downstream caches which request headers the response varies on. Critical for content-negotiated responses (compression, language, cookies, device class).
Info::
No `ETag` or `Last-Modified` -- conditional GET not supported
Without either header, browsers can't issue conditional GETs and refresh always re-downloads the full response body even when nothing changed. Add `ETag: "<hash>"` (or `Last-Modified: <date>`) on cacheable responses; the server returns 304 Not Modified when the client's cached copy is still valid, saving bandwidth.
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
Render-Blocking Resources
No render-blocking resources detected
No render-blocking resources detected
Info::
No render-blocking resources detected in <head>
A+Third-Party ResourcesNo third-party resources detectedPASS
Third-Party Resources
No third-party resources detected
No third-party resources detected
ACSS Performance Depth1 CSS depth issue(s) detectedPASS
CSS Performance Depth
1 CSS depth issue(s) detected
1 CSS depth issue(s) detected
Warning::
4 render-blocking stylesheet(s) -- recommended: <=3
Each `<link rel="stylesheet">` without a non-blocking `media` attribute holds up the first paint. Browsers download all of them before painting any content. Consolidate into 1-2 critical-path stylesheets; defer non-critical CSS via `<link rel="stylesheet" media="print" onload="this.media='all'">` or via the loadCSS pattern; inline above-the-fold CSS in `<style>` to short-circuit the request entirely.
Network Waterfall60 requests over 1221msINFO
Network Waterfall
60 requests over 1221ms
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Real-User Performance (CrUX)Field metrics from the Chrome User Experience ReportINFO
Real-User Performance (CrUX)
Field metrics from the Chrome User Experience Report
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
29 images, 105 KB total, 0 KB wasted
Image Optimization Audit
Total Images
29
Total Size
105 KB
Oversized
1
3 missing dimensions
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.