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Performance

· 14 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
65
GRADE
D
FIX
5
REVIEW
1
PASS
6
INFO
2

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

Mobile Desktop
25
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
97
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.

13.76 s

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

18.14 s

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

5.09 s

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

0.000

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

13.76 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.

31.42 s

Page Load Progression

912 ms
1.8 s
2.7 s
3.6 s
4.6 s
5.5 s
6.4 s
7.3 s
Checks
14
6 PASS 1 REVIEW 5 FIX
F
Page Weight Budget
Action
4.3 MB transferred, 240 requests
FIX
4.3 MB transferred, 240 requests
Critical::
Page weighs 12.5 MB (4.3 MB transferred)
Warning::
JavaScript is 3.2 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 3.2 MB
Info::
Fonts are 596 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 596 KB
Warning::
240 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.90 g CO2 per page load
4.3 MB / 2.4 MB budget
4.3 MB transferred
240 requests
0.90 g CO2 per page load
JavaScript 3.2 MiB 74%
Fonts 596.0 KiB 14%
Other 298.5 KiB 7%
Other 66.7 KiB 2%
CSS 61.1 KiB 1%
Images 59.8 KiB 1%
HTML 41.5 KiB 1%
Other 18.6 KiB 0%
Other 7.3 KiB 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

Subset fonts to include only used characters, or switch to system font stacks.

Why this matters

Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).

Source: web.dev font loading

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
99% third-party, 0 ms blocking
FIX
99% third-party, 0 ms blocking
Warning::
Third-party code accounts for 99% of page weight (4.3 MiB of 4.3 MiB)
Info::
Third-party blocking time is low (0 ms)
99%
First-party Third-party
F
JS Execution Cost
Action
12068ms total JS execution
FIX
12068ms total JS execution
Warning::
https://cdn.cookielaw.org/consent/7f944245-c5cd-4e...: 1664ms CPU time
Warning::
Unattributable: 1478ms CPU time
Warning::
https://t.contentsquare.net/uxa/12ea71a10da34.js: 1288ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=G-EVTF...: 925ms CPU time
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-NJX...: 867ms CPU time
Warning::
Third-party scripts: 11935ms (99% of total)

Main Thread Breakdown

Script Evaluation 66% Other 17% Script Parsing & Compilation 7% Style & Layout 5%
ScriptTotalScriptingParse/CompileParty
https://cdn.cookielaw.org/consent/7f944245-c5cd-4eed-a90e-dd955adfdd08/OtAutoBlock.js1664ms1583ms1ms3rd
Unattributable1478ms400ms0ms3rd
https://t.contentsquare.net/uxa/12ea71a10da34.js1288ms1180ms60ms3rd
https://www.googletagmanager.com/gtag/js?id=G-EVTFNG2S5Z&cx=c&gtm=4e6411925ms854ms48ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-NJXWQL867ms719ms82ms3rd
https://about.gitlab.com/_nuxt/DD5e-OS3.js863ms183ms3ms3rd
https://cdn.optimizely.com/js/5113954737848320.js734ms657ms52ms3rd
https://js.qualified.com/qualified.js?token=q2kjzSUxjtgnCEEB684ms487ms167ms3rd
https://cdn.cookielaw.org/scripttemplates/202512.1.0/otBannerSdk.js615ms261ms97ms3rd
https://about.gitlab.com/564ms18ms5ms3rd

Showing top 10 of 21 scripts

F
JS Bundles
Action
119 scripts, 1.0 MB unused
FIX
119 scripts, 1.0 MB unused
Warning::
https://js.qualified.com/qualified.js?token=q2kjzS...: 267 KB unused (73%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://app.cdn.lookbookhq.com/production/jukebox/...: 233 KB unused (76%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://about.gitlab.com/_nuxt/Du-QGObk.js: 93 KB unused (64%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdn.cookielaw.org/scripttemplates/202512.1...: 69 KB unused (55%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-ENFH...: 62 KB unused (38%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 1.0 MB
1045 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://js.qualified.com/qualified.js?token=q2kjzSUxjtgnCEEB370 KB267 KB (73%)✓3rd
https://app.cdn.lookbookhq.com/production/jukebox/current/jukebox.js308 KB233 KB (76%)✓3rd
https://about.gitlab.com/_nuxt/Du-QGObk.js149 KB93 KB (64%)✓3rd
https://cdn.cookielaw.org/scripttemplates/202512.1.0/otBannerSdk.js126 KB69 KB (55%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-ENFH3X7M5Y&cx=c&gtm=4e6411162 KB62 KB (38%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-EVTFNG2S5Z&cx=c&gtm=4e6411143 KB61 KB (43%)✓3rd
https://about.gitlab.com/_nuxt/DD5e-OS3.js160 KB56 KB (35%)✓3rd
https://t.contentsquare.net/uxa/12ea71a10da34.js147 KB53 KB (47%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-NJXWQL183 KB51 KB (28%)✓3rd
https://cdn.optimizely.com/js/5113954737848320.js112 KB50 KB (45%)✓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

D
HTTP Caching
Action
no-store (uncacheable)
FIX
no-store (uncacheable)
Info::
Cache-Control: no-store prevents all caching
Intentional for dynamic content, but increases server load for every page view.
Got: no-store
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

no-store

DirectiveValueMeaning
no-store—Never cache this response
C
Image Optimization
Action
31 images, 0 KB saveable
REVIEW
31 images, 0 KB saveable
Warning::
https://res.cloudinary.com/about-gitlab-com/image/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://res.cloudinary.com/about-gitlab-com/image/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://res.cloudinary.com/about-gitlab-com/image/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://res.cloudinary.com/about-gitlab-com/image/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://res.cloudinary.com/about-gitlab-com/image/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://res.cloudinary.com/about-gitlab-com/image/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://res.cloudinary.com/about-gitlab-com/image/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://res.cloudinary.com/about-gitlab-com/image/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
31 images 60 KB
0 oversized -0 KB
24 legacy format
9 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

Set explicit width and height to prevent CLS.

Why this matters

Performance issues directly impact user engagement and conversion rates.

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

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

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

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

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

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

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

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 (596 KB)
PASS
4 fonts (596 KB)
Info::
4 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

4

596 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 14.0 s 16.0 s 18.0 s FCP 13.8 s LCP 18.1 shttps://about.gitlab.com/fonts/gitlab-sans/GitLabSans.woff2GitLabSans.woff2 https://about.gitlab.com/fonts/gitlab-sans/GitLabSans.woff2 — 317.9 KiB — 0 ms — font-display: swaphttps://about.gitlab.com/fonts/gitlab-mono/GitLabMono.woff2GitLabMono.woff2 https://about.gitlab.com/fonts/gitlab-mono/GitLabMono.woff2 — 77.3 KiB — 0 ms — font-display: swaphttps://assets.qualified.com/packs/media/Inter-Regular.f1f0c35b.woff2Inter-Regular.f1f0c35b.... https://assets.qualified.com/packs/media/Inter-Regular.f1f0c35b.woff2 — 96.9 KiB — 0 ms — font-display: swaphttps://assets.qualified.com/packs/media/Inter-SemiBold.fcb100c7.woff2Inter-SemiBold.fcb100c7... https://assets.qualified.com/packs/media/Inter-SemiBold.fcb100c7.woff2 — 103.9 KiB — 0 ms — font-display: swap
GitLabSans.woff2 woff2 swap
Size 318 KB
Load time 0 ms
Start 0 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
GitLabMono.woff2 woff2 swap
Size 77 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
Inter-Regular.f1f0c35b.... woff2 swap
Size 97 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
Inter-SemiBold.fcb100c7... woff2 swap
Size 104 KB
Load time 0 ms
Start 0 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 ~211 KB and ~422 ms

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
6 hints, 0 missing preconnects
PASS
6 hints, 0 missing preconnects
Info::
Page uses 6 resource hint(s)

Current Resource Hints

preconnect
2
preload
3
dns-prefetch
1
prefetch
—

6 resource hints configured

A+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Cloudflare

Network Waterfall
240 requests over 0ms
INFO

Performance analysis not available for this result.

Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
99% of JavaScript execution is third-party
First-party Third-party 11935ms · 2030KB · €207/mo
OneTrust
Consent
Essential
Execution 1664ms
Transfer 3 KB
Monthly Cost €29/mo
Unattributable
Other
Costly
Execution 1478ms
Transfer 0 KB
Monthly Cost €26/mo
t.contentsquare.net
Other
Costly
Execution 1288ms
Transfer 147 KB
Unused 47%
Monthly Cost €22/mo
Google Tag Manager
Tag Manager
Costly
Execution 925ms
Transfer 143 KB
Unused 43%
Monthly Cost €16/mo
Google Tag Manager
Tag Manager
Costly
Execution 867ms
Transfer 183 KB
Unused 28%
Monthly Cost €15/mo
about.gitlab.com
Other
Costly
Execution 863ms
Transfer 160 KB
Unused 35%
Monthly Cost €15/mo
Optimizely
A/B Testing
Costly
Execution 734ms
Transfer 112 KB
Unused 45%
Monthly Cost €13/mo
js.qualified.com
Other
Costly
Execution 684ms
Transfer 370 KB
Unused 73%
Monthly Cost €12/mo
OneTrust
Consent
Essential
Execution 615ms
Transfer 126 KB
Unused 55%
Monthly Cost €11/mo
about.gitlab.com
Other
Costly
Execution 564ms
Transfer 35 KB
Monthly Cost €10/mo
app.cdn.lookbookhq.com
Other
Costly
Execution 542ms
Transfer 308 KB
Unused 76%
Monthly Cost €9/mo
Google Tag Manager
Tag Manager
Costly
Execution 394ms
Transfer 162 KB
Unused 38%
Monthly Cost €7/mo
client-registry.mutinycdn.com
Other
Costly
Execution 361ms
Transfer 32 KB
Monthly Cost €6/mo
Google Tag Manager
Tag Manager
Costly
Execution 314ms
Transfer 138 KB
Unused 36%
Monthly Cost €5/mo
j.6sc.co
Other
Costly
Execution 217ms
Transfer 19 KB
Monthly Cost €4/mo
cdn.bizible.com
Other
Optional
Execution 105ms
Transfer 25 KB
Monthly Cost €2/mo
about.gitlab.com
Other
Optional
Execution 103ms
Transfer 17 KB
Monthly Cost €2/mo
client-registry.mutinycdn.com
Other
Optional
Execution 91ms
Transfer 20 KB
Monthly Cost €2/mo
LinkedIn Insight
Advertising
Optional
Execution 68ms
Transfer 19 KB
Monthly Cost €1/mo
client-registry.mutinycdn.com
Other
Optional
Execution 57ms
Transfer 11 KB
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • Unattributable adds 1478ms and costs ~€26/month
  • t.contentsquare.net adds 1288ms and costs ~€22/month
  • Google Tag Manager adds 925ms and costs ~€16/month
  • Google Tag Manager adds 867ms and costs ~€15/month
  • about.gitlab.com adds 863ms and costs ~€15/month
  • Optimizely adds 734ms and costs ~€13/month
  • js.qualified.com adds 684ms and costs ~€12/month
  • about.gitlab.com adds 564ms and costs ~€10/month
  • app.cdn.lookbookhq.com adds 542ms and costs ~€9/month
  • Google Tag Manager adds 394ms and costs ~€7/month
  • client-registry.mutinycdn.com adds 361ms and costs ~€6/month
  • Google Tag Manager adds 314ms and costs ~€5/month
  • j.6sc.co adds 217ms and costs ~€4/month

99% 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

Unattributable takes 1478ms 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

t.contentsquare.net takes 1288ms 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 925ms 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 867ms 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

about.gitlab.com takes 863ms 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

Optimizely takes 734ms 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

js.qualified.com takes 684ms 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

73% of js.qualified.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

55% of OneTrust'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

about.gitlab.com takes 564ms 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

app.cdn.lookbookhq.com takes 542ms 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

76% of app.cdn.lookbookhq.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

Google Tag Manager takes 394ms 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

client-registry.mutinycdn.com takes 361ms 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 314ms 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

j.6sc.co takes 217ms 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

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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