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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
34
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.

4.10 s

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

4.86 s

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

615 ms

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.

4.10 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.

8.93 s

Page Load Progression

743 ms
1.5 s
2.2 s
3.0 s
3.7 s
4.5 s
5.2 s
5.9 s
Checks
14
6 PASS 1 REVIEW 5 FIX
F
Page Weight Budget
Action
4.4 MB transferred, 243 requests
FIX
4.4 MB transferred, 243 requests
Critical::
Page weighs 12.6 MB (4.4 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::
243 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.92 g CO2 per page load
4.4 MB / 2.4 MB budget
4.4 MB transferred
243 requests
0.92 g CO2 per page load
JavaScript 3.2 MiB 72%
Fonts 596.0 KiB 13%
Other 298.6 KiB 7%
Images 149.1 KiB 3%
Other 66.6 KiB 1%
CSS 61.0 KiB 1%
HTML 41.5 KiB 1%
Other 18.6 KiB 0%
Other 7.1 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 (4.4 MiB of 4.4 MiB)
Info::
Third-party blocking time is low (0 ms)
99%
First-party Third-party
D
JS Execution Cost
Action
2917ms total JS execution
FIX
2917ms total JS execution
Warning::
Unattributable: 468ms CPU time
Warning::
https://cdn.cookielaw.org/consent/7f944245-c5cd-4e...: 430ms CPU time
Warning::
https://about.gitlab.com/: 333ms CPU time
Warning::
https://about.gitlab.com/_nuxt/DD5e-OS3.js: 264ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-NJX...: 239ms CPU time
Warning::
Third-party scripts: 2917ms (100% of total)

Main Thread Breakdown

Script Evaluation 62% Other 19% Style & Layout 8% Script Parsing & Compilation 7%
ScriptTotalScriptingParse/CompileParty
Unattributable468ms147ms0ms3rd
https://cdn.cookielaw.org/consent/7f944245-c5cd-4eed-a90e-dd955adfdd08/OtAutoBlock.js430ms403ms0ms3rd
https://about.gitlab.com/333ms33ms1ms3rd
https://about.gitlab.com/_nuxt/DD5e-OS3.js264ms90ms1ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-NJXWQL239ms200ms21ms3rd
https://js.qualified.com/qualified.js?token=q2kjzSUxjtgnCEEB205ms135ms42ms3rd
https://www.googletagmanager.com/gtag/js?id=G-EVTFNG2S5Z&cx=c&gtm=4e6420h2200ms184ms12ms3rd
https://app.cdn.lookbookhq.com/production/jukebox/current/jukebox.js165ms122ms43ms3rd
https://t.contentsquare.net/uxa/12ea71a10da34.js131ms114ms16ms3rd
https://cdn.optimizely.com/js/5113954737848320.js106ms90ms15ms3rd

Showing top 10 of 15 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...: 260 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://t.contentsquare.net/uxa/12ea71a10da34.js: 84 KB unused (58%)
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.
Info::
Total unused JavaScript: 1.0 MB
1070 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://js.qualified.com/qualified.js?token=q2kjzSUxjtgnCEEB370 KB260 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://t.contentsquare.net/uxa/12ea71a10da34.js147 KB84 KB (58%)✓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=4e6420h2163 KB63 KB (39%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-EVTFNG2S5Z&cx=c&gtm=4e6420h2143 KB61 KB (43%)✓3rd
https://about.gitlab.com/_nuxt/DD5e-OS3.js160 KB55 KB (35%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-NJXWQL183 KB52 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
35 images, 0 KB saveable
REVIEW
35 images, 0 KB saveable
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.
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.
35 images 149 KB
0 oversized -0 KB
25 legacy format
9 missing dimensions CLS risk

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

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 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s FCP 4.1 s LCP 4.9 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
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
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
243 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
100% of JavaScript execution is third-party
First-party Third-party 2917ms · 1929KB · €51/mo
Unattributable
Other
Costly
Execution 468ms
Transfer 0 KB
Monthly Cost €8/mo
OneTrust
Consent
Essential
Execution 430ms
Transfer 3 KB
Monthly Cost €7/mo
about.gitlab.com
Other
Costly
Execution 333ms
Transfer 35 KB
Monthly Cost €6/mo
about.gitlab.com
Other
Costly
Execution 264ms
Transfer 160 KB
Unused 35%
Monthly Cost €5/mo
Google Tag Manager
Tag Manager
Costly
Execution 239ms
Transfer 183 KB
Unused 28%
Monthly Cost €4/mo
js.qualified.com
Other
Costly
Execution 205ms
Transfer 370 KB
Unused 73%
Monthly Cost €4/mo
Google Tag Manager
Tag Manager
Optional
Execution 200ms
Transfer 143 KB
Unused 43%
Monthly Cost €3/mo
app.cdn.lookbookhq.com
Other
Optional
Execution 165ms
Transfer 308 KB
Unused 76%
Monthly Cost €3/mo
t.contentsquare.net
Other
Optional
Execution 131ms
Transfer 147 KB
Unused 58%
Monthly Cost €2/mo
Optimizely
A/B Testing
Optional
Execution 106ms
Transfer 112 KB
Unused 45%
Monthly Cost €2/mo
OneTrust
Consent
Essential
Execution 94ms
Transfer 126 KB
Unused 55%
Monthly Cost €2/mo
Google Tag Manager
Tag Manager
Optional
Execution 89ms
Transfer 139 KB
Unused 36%
Monthly Cost €2/mo
Google Tag Manager
Tag Manager
Optional
Execution 72ms
Transfer 163 KB
Unused 39%
Monthly Cost €1/mo
j.6sc.co
Other
Optional
Execution 62ms
Transfer 19 KB
Monthly Cost €1/mo
client-registry.mutinycdn.com
Other
Optional
Execution 58ms
Transfer 21 KB
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • Unattributable adds 468ms and costs ~€8/month
  • about.gitlab.com adds 333ms and costs ~€6/month
  • about.gitlab.com adds 264ms and costs ~€5/month
  • Google Tag Manager adds 239ms and costs ~€4/month
  • js.qualified.com adds 205ms and costs ~€4/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

Unattributable takes 468ms 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 333ms 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 264ms 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 239ms 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 205ms 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

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

58% of t.contentsquare.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

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

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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