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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
69
GRADE
D
FIX
6
REVIEW
2
PASS
7
INFO
2

Performance-focused optimization plan with CWV assessment, top offenders, and time estimates

Mobile Desktop
29
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
95
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
77
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
100
SEO Measures basic SEO optimizations: meta tags, crawlability, link text, and mobile friendliness.

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

4.82 s

Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.

12.88 s

Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.

3.29 s

Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.

0.006

Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.

8.11 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.

21.71 s

Page Load Progression

600 ms
1.2 s
1.8 s
2.4 s
3.0 s
3.6 s
4.2 s
4.8 s
Checks
17
7 PASS 2 REVIEW 6 FIX
F
Page Weight Budget
Action
3.6 MB transferred, 135 requests
FIX
3.6 MB transferred, 135 requests
Warning::
Page weighs 7.7 MB (3.6 MB transferred)
Warning::
JavaScript is 1.5 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.5 MB
Warning::
135 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.75 g CO2 per page load
3.6 MB / 2.4 MB budget
3.6 MB transferred
135 requests
0.75 g CO2 per page load
JavaScript 1.5 MiB 41%
Other 1.0 MiB 29%
Images 601.7 KiB 16%
HTML 284.5 KiB 8%
Fonts 150.7 KiB 4%
CSS 42.6 KiB 1%
Other 8.2 KiB 0%
Other 7.3 KiB 0%
Other 5.1 KiB 0%
Other 2.4 KiB 0%
Other 646 B 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Over 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

Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.

Why this matters

High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.

Source: web.dev

D
Third-Party Impact
Action
100% third-party, 0 ms blocking
FIX
100% third-party, 0 ms blocking
Warning::
Third-party code accounts for 100% of page weight (3.6 MiB of 3.6 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
15562ms total JS execution
FIX
15562ms total JS execution
Warning::
https://d27scpai1jcyi9.cloudfront.net/613aa2a92c8b...: 6131ms CPU time
Warning::
https://www.alltrails.com/: 2572ms CPU time
Warning::
Unattributable: 1337ms CPU time
Warning::
https://cmp.osano.com/AzZqakTb9cVIa3Ok9/ca957679-3...: 972ms CPU time
Warning::
https://cdn.amplitude.com/libs/analytics-browser-2...: 602ms CPU time
Warning::
Third-party scripts: 15562ms (100% of total)

Main Thread Breakdown

Script Evaluation 63% Other 17% Style & Layout 8% Script Parsing & Compilation 5% Rendering 4%
ScriptTotalScriptingParse/CompileParty
https://d27scpai1jcyi9.cloudfront.net/613aa2a92c8b3f4226563689dada553a81b2bf6c/_next/static/chunks/6337-5805f447cbad85bb.js6131ms5033ms40ms3rd
https://www.alltrails.com/2572ms25ms67ms3rd
Unattributable1337ms173ms0ms3rd
https://cmp.osano.com/AzZqakTb9cVIa3Ok9/ca957679-3953-4131-9f80-8e7ef8f97a4f/osano.js?language=en972ms872ms29ms3rd
https://cdn.amplitude.com/libs/analytics-browser-2.9.3-min.js.gz602ms508ms8ms3rd
https://d27scpai1jcyi9.cloudfront.net/613aa2a92c8b3f4226563689dada553a81b2bf6c/_next/static/chunks/3390.cb118c71c26a0972.js545ms511ms0ms3rd
https://www.googletagmanager.com/gtag/js?id=G-V6WJN779TY483ms369ms107ms3rd
https://analytics.tiktok.com/i18n/pixel/static/main.MWE0ZWQ3ZWQwMQ.js344ms274ms65ms3rd
https://www.redditstatic.com/ads/pixel.js300ms252ms7ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-W6N3M9195ms150ms41ms3rd

Showing top 10 of 27 scripts

F
JS Bundles
Action
48 scripts, 551 KB unused
FIX
48 scripts, 551 KB unused
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-W6N...: 72 KB unused (58%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://accounts.google.com/gsi/client: 68 KB unused (72%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-V6WJ...: 68 KB unused (40%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://analytics.tiktok.com/i18n/pixel/static/mai...: 59 KB unused (55%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://connect.facebook.net/en_US/fbevents.js: 47 KB unused (48%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 551 KB
551 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtm.js?id=GTM-W6N3M9125 KB72 KB (58%)✓3rd
https://accounts.google.com/gsi/client96 KB68 KB (72%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-V6WJN779TY170 KB68 KB (40%)✓3rd
https://analytics.tiktok.com/i18n/pixel/static/main.MWE0ZWQ3ZWQwMQ.js110 KB59 KB (55%)✓3rd
https://connect.facebook.net/en_US/fbevents.js97 KB47 KB (48%)✓3rd
https://d27scpai1jcyi9.cloudfront.net/613aa2a92c8b3f4226563689dada553a81b2bf6c/_next/static/chunks/3305-c321d514955700a0.js65 KB36 KB (56%)✓3rd
https://d27scpai1jcyi9.cloudfront.net/613aa2a92c8b3f4226563689dada553a81b2bf6c/_next/static/chunks/6337-5805f447cbad85bb.js71 KB32 KB (45%)✓3rd
https://www.datadoghq-browser-agent.com/us1/v5/datadog-rum.js52 KB28 KB (55%)✓3rd
https://d27scpai1jcyi9.cloudfront.net/613aa2a92c8b3f4226563689dada553a81b2bf6c/_next/static/chunks/app/%5Blocale%5D/page-2651b129ba65efd7.js92 KB27 KB (29%)✓3rd
https://d27scpai1jcyi9.cloudfront.net/613aa2a92c8b3f4226563689dada553a81b2bf6c/_next/static/chunks/861.be67df40b123aee5.js39 KB27 KB (69%)✓3rd

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

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

F
Page Weight Inventory
Action
135 resources · 3.6 MB · 551 KB savings available
FIX
135 resources · 3.6 MB · 551 KB savings available
Warning::
Page weight 2.6 MB over 1MB target
Got: 3.6 MB Expected: ≤ 1 MB
Info::
~551 KB of savings available
Warning::
134 third-party resources (100% of weight)
Info::
2 resources over 200KB
135 resources · 3.6 MiB · 134 third-party 2.6 MiB over 1MB target
JavaScript 41% · 1.5 MiB
Media 29% · 1.0 MiB
Image 17% · 610.9 KiB
Document 8% · 286.7 KiB
Font 4% · 150.7 KiB
CSS 1% · 42.6 KiB
Other 0% · 12.3 KiB

~551.4 KiB of savings available

Remove unused JavaScript: 551.4 KiB
F
HTTP Caching
Action
No cache headers
FIX
No cache headers
Warning::
No Cache-Control header found
Browsers will use heuristic caching, which can be unpredictable. Set explicit cache headers.

No Cache-Control header

Adding a Cache-Control header can significantly improve repeat-visit performance.

B
Image Optimization
27 images, 0 KB saveable
REVIEW
27 images, 0 KB saveable
Warning::
https://d27scpai1jcyi9.cloudfront.net/613aa2a92c8b... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
27 images 602 KB
0 oversized -0 KB
5 legacy format
1 missing dimensions CLS risk

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Text Compression
All text resources are compressed
PASS
All text resources are compressed
Info::
All text resources are compressed
All text resources are properly compressed.
A+
Font Loading
4 fonts (151 KB)
PASS
4 fonts (151 KB)
Info::
4 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

4

151 KB total

Render-blocking

0

of 4

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s FCP 4.8 s LCP 12.9 shttps://cdn-assets-2.alltrails.com/assets/aeonik-medium-81496b49e1e345e2a7803ddfe8e98ddd695b66f385f43b66975fa53d8215abeb.woff2aeonik-medium-81496b49e... https://cdn-assets-2.alltrails.com/assets/aeonik-medium-81496b49e1e345e2a7803ddfe8e98ddd695b66f385f43b66975fa53d8215abeb.woff2 — 68.7 KiB — 84 ms — font-display: swaphttps://cdn-assets-2.alltrails.com/assets/aeonik-regular-ee9d02127cfdb2aef717576a3881369ecc5e5f5c940bd2cc61a077c848c40b69.woff2aeonik-regular-ee9d0212... https://cdn-assets-2.alltrails.com/assets/aeonik-regular-ee9d02127cfdb2aef717576a3881369ecc5e5f5c940bd2cc61a077c848c40b69.woff2 — 66.2 KiB — 71 ms — font-display: swaphttps://static.captcha-delivery.com/common/fonts/roboto/roboto.woff2roboto.woff2 https://static.captcha-delivery.com/common/fonts/roboto/roboto.woff2 — 15.8 KiB — 16 ms — font-display: swaphttps://static.captcha-delivery.com/common/fonts/roboto/roboto.woff2roboto.woff2 https://static.captcha-delivery.com/common/fonts/roboto/roboto.woff2 — 0 B — 0 ms — font-display: swap
aeonik-medium-81496b49e... woff2 swap
Size 69 KB
Load time 84 ms
Start 405 ms
Risk FOUT — text flashes from fallback to web font
aeonik-regular-ee9d0212... woff2 swap
Size 66 KB
Load time 71 ms
Start 408 ms
Risk FOUT — text flashes from fallback to web font
roboto.woff2 woff2 swap
Size 16 KB
Load time 16 ms
Start 2.6 s
Risk FOUT — text flashes from fallback to web font
roboto.woff2 woff2 swap
Size 0 KB
Load time 0 ms
Start 4.6 s
Risk FOUT — text flashes from fallback to web font
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)
A+
Resource Caching
All resources properly cached
PASS
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+
Critical Rendering Path
No render-blocking resources
PASS
No render-blocking resources
Info::
No render-blocking resources detected
A+
Resource Hints
10 hints, 0 missing preconnects
PASS
10 hints, 0 missing preconnects
Info::
Page uses 10 resource hint(s)

Current Resource Hints

preconnect
5
preload
5
dns-prefetch
—
prefetch
—

10 resource hints configured

A+
Render-Blocking Resources
No render-blocking resources detected
PASS
No render-blocking resources detected
Info::
No render-blocking resources detected in <head>
A+
Third-Party Resources
No third-party resources detected
PASS
No third-party resources detected
Network Waterfall
135 requests over 4784ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s FCP 4.8 s LCP 12.9 shttps://alltrails.com// https://alltrails.com/ — 301 — 242 B — 73 ms — h2https://www.alltrails.com/www.alltrails.com/ https://www.alltrails.com/ — 200 — 56.5 KiB — 157 ms — h2https://d27scpai1jcyi9.cloudfront.net/613aa2a92c8b3f4226563689dada553a81b2bf6c/_next/static/css/01897a355a21ac33.cssd27scpai1jcyi9.cloudfront.net/613aa... https://d27scpai1jcyi9.cloudfront.net/613aa2a92c8b3f4226563689dada553a81b2bf6c/_next/static/css/01897a355a21ac33.css — 200 — 5.6 KiB — 55 ms — h2https://www.alltrails.com/mugen/image/root?url=https%3A%2F%2Fd27scpai1jcyi9.cloudfront.net%2F613aa2a92c8b3f4226563689dada553a81b2bf6c%2F_next%2Fstatic%2Fmedia%2Fhero-1.6b82a319.avif&w=750&q=75www.alltrails.com/mugen/image/root?... https://www.alltrails.com/mugen/image/root?url=https%3A%2F%2Fd27scpai1jcyi9.cloudfront.net%2F613aa2a92c8b3f4226563689dada553a81b2bf6c%2F_next%2Fstatic%2Fmedia%2Fhero-1.6b82a319.avif&w=750&q=75 — 200 — 70.9 KiB — 41 ms — h2https://d27scpai1jcyi9.cloudfront.net/613aa2a92c8b3f4226563689dada553a81b2bf6c/_next/static/css/18e0751e2ae0ea2b.cssd27scpai1jcyi9.cloudfront.net/613aa... https://d27scpai1jcyi9.cloudfront.net/613aa2a92c8b3f4226563689dada553a81b2bf6c/_next/static/css/18e0751e2ae0ea2b.css — 200 — 14.4 KiB — 53 ms — h2https://d27scpai1jcyi9.cloudfront.net/613aa2a92c8b3f4226563689dada553a81b2bf6c/_next/static/css/d802f324c0af086c.cssd27scpai1jcyi9.cloudfront.net/613aa... https://d27scpai1jcyi9.cloudfront.net/613aa2a92c8b3f4226563689dada553a81b2bf6c/_next/static/css/d802f324c0af086c.css — 200 — 6.5 KiB — 49 ms — h2https://d27scpai1jcyi9.cloudfront.net/613aa2a92c8b3f4226563689dada553a81b2bf6c/_next/static/css/824fad702f99084d.cssd27scpai1jcyi9.cloudfront.net/613aa... https://d27scpai1jcyi9.cloudfront.net/613aa2a92c8b3f4226563689dada553a81b2bf6c/_next/static/css/824fad702f99084d.css — 200 — 3.3 KiB — 51 ms — h2https://www.datadoghq-browser-agent.com/us1/v5/datadog-rum.jswww.datadoghq-browser-agent.com/us1... https://www.datadoghq-browser-agent.com/us1/v5/datadog-rum.js — 200 — 52.0 KiB — 82 ms — h2https://www.googletagmanager.com/gtag/js?id=G-V6WJN779TYwww.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-V6WJN779TY — 200 — 169.9 KiB — 133 ms — h2https://cmp.osano.com/AzZqakTb9cVIa3Ok9/ca957679-3953-4131-9f80-8e7ef8f97a4f/osano.js?language=encmp.osano.com/AzZqakTb9cVIa3Ok9/ca9... https://cmp.osano.com/AzZqakTb9cVIa3Ok9/ca957679-3953-4131-9f80-8e7ef8f97a4f/osano.js?language=en — 200 — 73.7 KiB — 115 ms — h3https://www.alltrails.com/mugen/image/root?url=https%3A%2F%2Fd27scpai1jcyi9.cloudfront.net%2F613aa2a92c8b3f4226563689dada553a81b2bf6c%2F_next%2Fstatic%2Fmedia%2Fhero-2.7aedfc05.avif&w=750&q=75www.alltrails.com/mugen/image/root?... https://www.alltrails.com/mugen/image/root?url=https%3A%2F%2Fd27scpai1jcyi9.cloudfront.net%2F613aa2a92c8b3f4226563689dada553a81b2bf6c%2F_next%2Fstatic%2Fmedia%2Fhero-2.7aedfc05.avif&w=750&q=75 — 200 — 28.8 KiB — 247 ms — h2https://www.alltrails.com/mugen/image/root?url=https%3A%2F%2Fd27scpai1jcyi9.cloudfront.net%2F613aa2a92c8b3f4226563689dada553a81b2bf6c%2F_next%2Fstatic%2Fmedia%2Fhero-3.bfe46014.avif&w=750&q=75www.alltrails.com/mugen/image/root?... https://www.alltrails.com/mugen/image/root?url=https%3A%2F%2Fd27scpai1jcyi9.cloudfront.net%2F613aa2a92c8b3f4226563689dada553a81b2bf6c%2F_next%2Fstatic%2Fmedia%2Fhero-3.bfe46014.avif&w=750&q=75 — 200 — 45.4 KiB — 70 ms — h2https://www.alltrails.com/mugen/image/root?url=https%3A%2F%2Fd27scpai1jcyi9.cloudfront.net%2F613aa2a92c8b3f4226563689dada553a81b2bf6c%2F_next%2Fstatic%2Fmedia%2Fhero-4.bc5e1496.avif&w=750&q=75www.alltrails.com/mugen/image/root?... https://www.alltrails.com/mugen/image/root?url=https%3A%2F%2Fd27scpai1jcyi9.cloudfront.net%2F613aa2a92c8b3f4226563689dada553a81b2bf6c%2F_next%2Fstatic%2Fmedia%2Fhero-4.bc5e1496.avif&w=750&q=75 — 200 — 29.1 KiB — 241 ms — h2https://www.alltrails.com/mugen/image/root?url=https%3A%2F%2Fd27scpai1jcyi9.cloudfront.net%2F613aa2a92c8b3f4226563689dada553a81b2bf6c%2F_next%2Fstatic%2Fmedia%2Fhero-5.1a63e236.avif&w=750&q=75www.alltrails.com/mugen/image/root?... https://www.alltrails.com/mugen/image/root?url=https%3A%2F%2Fd27scpai1jcyi9.cloudfront.net%2F613aa2a92c8b3f4226563689dada553a81b2bf6c%2F_next%2Fstatic%2Fmedia%2Fhero-5.1a63e236.avif&w=750&q=75 — 200 — 42.7 KiB — 301 ms — h2https://www.alltrails.com/manifest.jsonwww.alltrails.com/manifest.json https://www.alltrails.com/manifest.json — 200 — 646 B — 86 ms — h2https://d27scpai1jcyi9.cloudfront.net/613aa2a92c8b3f4226563689dada553a81b2bf6c/_next/static/media/phone-body.9e149ae3.avifd27scpai1jcyi9.cloudfront.net/613aa... 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https://px.mountain.com/st?ga_tracking_id=G-V6WJN779TY&ga_client_id=1835991664.1776804078&shpt=AllTrails%3A%20Trail%20Guides%20%26%20Maps%20for%20Hiking%20Camping%20and%20Running%20%7C%20AllTrails&dcm_cid=s1776804077%24o1%24g0%24t1776804077%24j60%24l0%24h0.undefined&available_ga=%5B%7B%22id%22%3A%22G-V6WJN779TY%22%2C%22sess_id%22%3A%221776804077%22%7D%5D&ga_info=%7B%22status%22%3A%22OK%22%2C%22available_ga%22%3A%5B%7B%22id%22%3A%22G-V6WJN779TY%22%2C%22sess_id%22%3A%221776804077%22%7D%5D%2C%22hardcoded_ga%22%3A%22G-V6WJN779TY%22%2C%22ga_tracking_id%22%3A%22G-V6WJN779TY%22%2C%22ga_client_id%22%3A%221835991664.1776804078%22%2C%22shpt%22%3A%22AllTrails%3A%20Trail%20Guides%20%26%20Maps%20for%20Hiking%20Camping%20and%20Running%20%7C%20AllTrails%22%2C%22dcm_cid%22%3A%22s1776804077%24o1%24g0%24t1776804077%24j60%24l0%24h0.undefined%22%2C%22mntnis%22%3A%22wVm8do3Buu7P8Uz93zqqPItN45J6xkIS%22%2C%22execution_workflow%22%3A%7B%22iteration%22%3A2%2C%22getClientIdByCookie%22%3A%22OK%22%2C%22shpt%22%3A%22OK%22%2C%22dcm_cid%22%3A%22OK%22%7D%7D&hardcoded_ga=G-V6WJN779TY&meta_tag_data=%5B%7B%22description.content%22%3A%22Explore%20the%20outdoors%20with%20AllTrails%2C%20the%20best%20app%20for%20hiking%2C%20biking%2C%20and%20running.%20Discover%20curated%20guides%2C%20trail%20maps%2C%20photos%2C%20and%20reviews%20for%20over%20500%2C000%20trails%20worldwide.%22%7D%2C%7B%22title.content%22%3A%22AllTrails%3A%20Trail%20Guides%20%26%20Maps%20for%20Hiking%2C%20Camping%2C%20and%20Running%20%7C%20AllTrails%22%7D%5D&dxver=4.0.0&shaid=38321&plh=https%3A%2F%2Fwww.alltrails.com%2F&shadditional=googletagmanager%3Dtrue%2Cga4%3Dtrue&cb=1776804079372874&shguid=8fbcb9d3-a56e-3176-8056-574203c9ff3b&shgts=1776804079465 — 200 — 582 B — 112 ms — h2https://ct.pinterest.com/static/ct/token_create.jsct.pinterest.com/static/ct/token_cr... https://ct.pinterest.com/static/ct/token_create.js — 200 — 3.9 KiB — 7 ms — h3https://ct.pinterest.com/ct.htmlct.pinterest.com/ct.html https://ct.pinterest.com/ct.html — 200 — 604 B — 85 ms — h2https://api.sprig.com/sdk/1/environments/slnFv1rd2aaf/configapi.sprig.com/sdk/1/environments/sl... https://api.sprig.com/sdk/1/environments/slnFv1rd2aaf/config — 200 — 817 B — 88 ms — http/1.1https://api2.amplitude.com/2/httpapiapi2.amplitude.com/2/httpapi https://api2.amplitude.com/2/httpapi — 200 — 0 B — 96 ms — h2https://geo.captcha-delivery.com/interstitial/geo.captcha-delivery.com/interstiti... https://geo.captcha-delivery.com/interstitial/ — 200 — 876 B — 13 ms — http/1.1https://geo.captcha-delivery.com/captcha/?initialCid=AHrlqAAAAAMAgauHvDkbQNMAXCaVCw==&cid=eg64XoUxdR9hMdvUKPBejyWj8y9tAeoyGjYoJA~cSlxlFH_BON~kAPng_2agW462Kqp8yPmDH_uvthRAZn7iCrAEbKeQZxTxWyEa2oEU9yyNSERKVQb~OjRuvVNGrstv&referer=https%3A%2F%2Fwww.alltrails.com%2F&hash=9D463B509A4C91FDFF39B265B3E2BC&t=bv&s=30067&e=b21ea6ab0adf270924243d7fdd7ea84db0bd5c5b8d63e8efc9ad4e6f58d22bbf26dbbe4c960c1aaff1dcae114d2f4b7b&ir=40%2C13%2C12%2C91%2C29%2C32%2C37%2C512482&dm=dc_ir&b=13725geo.captcha-delivery.com/captcha/?i... https://geo.captcha-delivery.com/captcha/?initialCid=AHrlqAAAAAMAgauHvDkbQNMAXCaVCw==&cid=eg64XoUxdR9hMdvUKPBejyWj8y9tAeoyGjYoJA~cSlxlFH_BON~kAPng_2agW462Kqp8yPmDH_uvthRAZn7iCrAEbKeQZxTxWyEa2oEU9yyNSERKVQb~OjRuvVNGrstv&referer=https%3A%2F%2Fwww.alltrails.com%2F&hash=9D463B509A4C91FDFF39B265B3E2BC&t=bv&s=30067&e=b21ea6ab0adf270924243d7fdd7ea84db0bd5c5b8d63e8efc9ad4e6f58d22bbf26dbbe4c960c1aaff1dcae114d2f4b7b&ir=40%2C13%2C12%2C91%2C29%2C32%2C37%2C512482&dm=dc_ir&b=13725 — 200 — 6.9 KiB — 7 ms — http/1.1https://static.captcha-delivery.com/common/fonts/roboto/font-face.cssstatic.captcha-delivery.com/common/... https://static.captcha-delivery.com/common/fonts/roboto/font-face.css — 200 — 0 B — 0 ms — h2https://static.captcha-delivery.com/captcha/assets/tpl/6dc485c0c428c35b53577b146dc6f9179f55ef9ad41b327a2a179998839364bf/index.cssstatic.captcha-delivery.com/captcha... https://static.captcha-delivery.com/captcha/assets/tpl/6dc485c0c428c35b53577b146dc6f9179f55ef9ad41b327a2a179998839364bf/index.css — 200 — 1.8 KiB — 10 ms — h2https://static.captcha-delivery.com/captcha/assets/set/70be94963ffd469e3ad12ebf1ffb3d8354cb8a8e/logo.png?update_cache=-1037348883666380757static.captcha-delivery.com/captcha... https://static.captcha-delivery.com/captcha/assets/set/70be94963ffd469e3ad12ebf1ffb3d8354cb8a8e/logo.png?update_cache=-1037348883666380757 — 200 — 7.9 KiB — 159 ms — h2https://static.captcha-delivery.com/common/fonts/roboto/roboto.woff2static.captcha-delivery.com/common/... https://static.captcha-delivery.com/common/fonts/roboto/roboto.woff2 — 200 — 0 B — 0 ms — h2
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
100% of JavaScript execution is third-party
First-party Third-party 15562ms · 1292KB · €249/mo
d27scpai1jcyi9.cloudfront.net
Other
Costly
Execution 6131ms
Transfer 71 KB
Unused 45%
Monthly Cost €98/mo
www.alltrails.com
Other
Costly
Execution 2572ms
Transfer 57 KB
Monthly Cost €41/mo
Unattributable
Other
Costly
Execution 1337ms
Transfer 0 KB
Monthly Cost €21/mo
cmp.osano.com
Other
Costly
Execution 972ms
Transfer 74 KB
Unused 30%
Monthly Cost €16/mo
Amplitude
Analytics
Costly
Execution 602ms
Transfer 19 KB
Monthly Cost €10/mo
d27scpai1jcyi9.cloudfront.net
Other
Costly
Execution 545ms
Transfer 1 KB
Monthly Cost €9/mo
Google Tag Manager
Tag Manager
Costly
Execution 483ms
Transfer 170 KB
Unused 40%
Monthly Cost €8/mo
analytics.tiktok.com
Other
Costly
Execution 344ms
Transfer 110 KB
Unused 55%
Monthly Cost €6/mo
www.redditstatic.com
Other
Costly
Execution 300ms
Transfer 19 KB
Monthly Cost €5/mo
Google Tag Manager
Tag Manager
Optional
Execution 195ms
Transfer 125 KB
Unused 58%
Monthly Cost €3/mo
utt.impactcdn.com
Other
Optional
Execution 194ms
Transfer 21 KB
Monthly Cost €3/mo
www.datadoghq-browser-agent.com
Other
Optional
Execution 192ms
Transfer 52 KB
Unused 55%
Monthly Cost €3/mo
dx.mountain.com
Other
Optional
Execution 190ms
Transfer 6 KB
Monthly Cost €3/mo
Facebook Pixel
Advertising
Optional
Execution 166ms
Transfer 97 KB
Unused 48%
Monthly Cost €3/mo
d27scpai1jcyi9.cloudfront.net
Other
Optional
Execution 150ms
Transfer 65 KB
Unused 56%
Monthly Cost €2/mo
Bing UET
Advertising
Optional
Execution 147ms
Transfer 16 KB
Monthly Cost €2/mo
datadome.alltrails.com
Other
Optional
Execution 145ms
Transfer 41 KB
Monthly Cost €2/mo
d27scpai1jcyi9.cloudfront.net
Other
Optional
Execution 133ms
Transfer 29 KB
Monthly Cost €2/mo
d27scpai1jcyi9.cloudfront.net
Other
Optional
Execution 126ms
Transfer 59 KB
Monthly Cost €2/mo
s.pinimg.com
Other
Optional
Execution 119ms
Transfer 27 KB
Monthly Cost €2/mo
websdk.appsflyersdk.com
Other
Optional
Execution 115ms
Transfer 16 KB
Monthly Cost €2/mo
cdn.sprig.com
Other
Optional
Execution 80ms
Transfer 29 KB
Unused 71%
Monthly Cost €1/mo
d27scpai1jcyi9.cloudfront.net
Other
Optional
Execution 79ms
Transfer 3 KB
Monthly Cost €1/mo
d27scpai1jcyi9.cloudfront.net
Other
Optional
Execution 63ms
Transfer 3 KB
Monthly Cost €1/mo
analytics.tiktok.com
Other
Optional
Execution 62ms
Transfer 40 KB
Monthly Cost €1/mo
accounts.google.com
Other
Optional
Execution 62ms
Transfer 96 KB
Unused 72%
Monthly Cost €1/mo
js.appboycdn.com
Other
Optional
Execution 59ms
Transfer 49 KB
Unused 48%
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • d27scpai1jcyi9.cloudfront.net adds 6131ms and costs ~€98/month
  • www.alltrails.com adds 2572ms and costs ~€41/month
  • Unattributable adds 1337ms and costs ~€21/month
  • cmp.osano.com adds 972ms and costs ~€16/month
  • Amplitude adds 602ms and costs ~€10/month
  • d27scpai1jcyi9.cloudfront.net adds 545ms and costs ~€9/month
  • Google Tag Manager adds 483ms and costs ~€8/month
  • analytics.tiktok.com adds 344ms and costs ~€6/month
  • www.redditstatic.com adds 300ms and costs ~€5/month

100% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.

Why this matters

When third-party JS execution time exceeds your own, performance gains from frontend work are capped by code you don't own.

Learn more ▾

Every millisecond of third-party JS competes with your own for main-thread time. If their share is bigger than yours, optimization on your code base barely moves the needle. Audit, defer, or remove third-parties before further frontend optimization. Use Lighthouse's third-party audit to identify the worst offenders.

Source: web.dev

d27scpai1jcyi9.cloudfront.net takes 6131ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

www.alltrails.com takes 2572ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

Unattributable takes 1337ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

cmp.osano.com takes 972ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

Amplitude takes 602ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

d27scpai1jcyi9.cloudfront.net takes 545ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

Google Tag Manager takes 483ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

analytics.tiktok.com takes 344ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

55% of analytics.tiktok.com's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

www.redditstatic.com takes 300ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

58% of Google Tag Manager's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

55% of www.datadoghq-browser-agent.com's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

56% of d27scpai1jcyi9.cloudfront.net's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

71% of cdn.sprig.com's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

72% of accounts.google.com's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

How third-party costs are calculated

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

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