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https://angular.dev

Performance

· 14 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
81
GRADE
B
FIX
1
REVIEW
4
PASS
7
INFO
2

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

Mobile Desktop
33
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.
100
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
92
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.

6.23 s

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

6.53 s

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

2.06 s

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

0.054

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

6.23 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.

8.81 s

Page Load Progression

375 ms
750 ms
1.1 s
1.5 s
1.9 s
2.2 s
2.6 s
3.0 s
Checks
14
7 PASS 4 REVIEW 1 FIX
F
JS Execution Cost
Action
7668ms total JS execution
FIX
7668ms total JS execution
Warning::
https://angular.dev/: 3486ms CPU time
Warning::
Unattributable: 2904ms CPU time
Warning::
https://angular.dev/main-ODORI6IS.js: 819ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=G-XB6N...: 459ms CPU time
Info::
Third-party scripts: 3363ms (44% of total)

Main Thread Breakdown

Script Evaluation 41% Style & Layout 31% Other 17% Rendering 8%
ScriptTotalScriptingParse/CompileParty
https://angular.dev/3486ms18ms2ms1st
Unattributable2904ms2090ms0ms3rd
https://angular.dev/main-ODORI6IS.js819ms691ms9ms1st
https://www.googletagmanager.com/gtag/js?id=G-XB6NEVW32B459ms353ms99ms3rd
B
Page Weight Budget
1.3 MB transferred, 27 requests
REVIEW
1.3 MB transferred, 27 requests
Info::
Page weighs 3.7 MB (1.3 MB transferred)
Warning::
JavaScript is 656 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 656 KB
Info::
Fonts are 510 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 510 KB
Info::
27 HTTP requests
Info::
Estimated 0.26 g CO2 per page load
1.3 MB / 2.4 MB budget
1.3 MB transferred
27 requests
0.26 g CO2 per page load
JavaScript 656.3 KiB 51%
Fonts 509.6 KiB 40%
Images 87.8 KiB 7%
HTML 14.7 KiB 1%
CSS 11.8 KiB 1%
Other 4.0 KiB 0%
Other 1.1 KiB 0%
Other 540 B 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

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

B
Third-Party Impact
52% third-party, 0 ms blocking
REVIEW
52% third-party, 0 ms blocking
Warning::
Third-party code accounts for 52% of page weight (667.9 KiB of 1.3 MiB)
Info::
Third-party blocking time is low (0 ms)
48%
52%
First-party Third-party
C
JS Bundles
Action
10 scripts, 185 KB unused
REVIEW
10 scripts, 185 KB unused
Warning::
https://angular.dev/main-ODORI6IS.js: 121 KB unused (45%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-XB6N...: 64 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 185 KB
185 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://angular.dev/main-ODORI6IS.js267 KB121 KB (45%)✓1st
https://www.googletagmanager.com/gtag/js?id=G-XB6NEVW32B156 KB64 KB (41%)✓3rd
https://angular.dev/chunk-CONbj4sA.js3 KB—✓1st
https://angular.dev/chunk-UPzlWjdi.js6 KB—✓1st
https://angular.dev/chunk-CGY2Lzob.js3 KB—✓1st
https://angular.dev/chunk-DDxS0XVV.js72 KB—✓1st
https://angular.dev/chunk-Dm15vQv9.js1 KB—✓1st
https://angular.dev/chunk-DqNpavbC.js2 KB—✓1st
https://angular.dev/chunk-DOE0vbFw.js1 KB—✓1st
https://angular.dev/chunk-D_aHl8k9.js146 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

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
Image Optimization
3 images, 0 KB saveable
PASS
3 images, 0 KB saveable
Info::
All images are well-optimized
3 images 88 KB
0 oversized -0 KB
2 legacy format
0 missing dimensions CLS risk
A+
Font Loading
6 fonts (510 KB)
PASS
6 fonts (510 KB)
Info::
6 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

6

510 KB total

Render-blocking

0

of 6

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 6.0 s FCP 6.2 s LCP 6.5 shttps://fonts.gstatic.com/s/inter/v20/UcC73FwrK3iLTeHuS_nVMrMxCp50SjIa1ZL7W0Q5nw.woff2UcC73FwrK3iLTeHuS_nVMrM... https://fonts.gstatic.com/s/inter/v20/UcC73FwrK3iLTeHuS_nVMrMxCp50SjIa1ZL7W0Q5nw.woff2 — 47.3 KiB — 0 ms — font-display: swaphttps://fonts.gstatic.com/s/materialsymbolsoutlined/v323/kJF1BvYX7BgnkSrUwT8OhrdQw4oELdPIeeII9v6oDMzByHX9rA6RzaxHMPdY43zj-jCxv3fzvRNU22ZXGJpEpjC_1v-p_4MrImHCIJIZrDCvHOejbdhzrA.woff2kJF1BvYX7BgnkSrUwT8Ohrd... https://fonts.gstatic.com/s/materialsymbolsoutlined/v323/kJF1BvYX7BgnkSrUwT8OhrdQw4oELdPIeeII9v6oDMzByHX9rA6RzaxHMPdY43zj-jCxv3fzvRNU22ZXGJpEpjC_1v-p_4MrImHCIJIZrDCvHOejbdhzrA.woff2 — 308.2 KiB — 0 ms — font-display: swaphttps://fonts.gstatic.com/s/intertight/v9/NGSwv5HMAFg6IuGlBNMjxLsH8ahuQ2e8.woff2NGSwv5HMAFg6IuGlBNMjxLs... https://fonts.gstatic.com/s/intertight/v9/NGSwv5HMAFg6IuGlBNMjxLsH8ahuQ2e8.woff2 — 43.9 KiB — 0 ms — font-display: swaphttps://fonts.gstatic.com/s/inter/v20/UcC73FwrK3iLTeHuS_nVMrMxCp50SjIa25L7W0Q5n-wU.woff2UcC73FwrK3iLTeHuS_nVMrM... https://fonts.gstatic.com/s/inter/v20/UcC73FwrK3iLTeHuS_nVMrMxCp50SjIa25L7W0Q5n-wU.woff2 — 83.3 KiB — 0 ms — font-display: swaphttps://fonts.gstatic.com/s/inter/v20/UcC73FwrK3iLTeHuS_nVMrMxCp50SjIa0ZL7W0Q5n-wU.woff2UcC73FwrK3iLTeHuS_nVMrM... https://fonts.gstatic.com/s/inter/v20/UcC73FwrK3iLTeHuS_nVMrMxCp50SjIa0ZL7W0Q5n-wU.woff2 — 18.3 KiB — 0 ms — font-display: swaphttps://fonts.gstatic.com/s/dmmono/v16/aFTU7PB1QTsUX8KYthqQBK6PYK0.woff2aFTU7PB1QTsUX8KYthqQBK6... https://fonts.gstatic.com/s/dmmono/v16/aFTU7PB1QTsUX8KYthqQBK6PYK0.woff2 — 8.5 KiB — 0 ms — font-display: swap
UcC73FwrK3iLTeHuS_nVMrM... woff2 swap
Size 47 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
kJF1BvYX7BgnkSrUwT8Ohrd... woff2 swap
Size 308 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
NGSwv5HMAFg6IuGlBNMjxLs... woff2 swap
Size 44 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
UcC73FwrK3iLTeHuS_nVMrM... woff2 swap
Size 83 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
UcC73FwrK3iLTeHuS_nVMrM... woff2 swap
Size 18 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
aFTU7PB1QTsUX8KYthqQBK6... woff2 swap
Size 9 KB
Load time 0 ms
Start 0 ms
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)

Fixing the unchecked items could save ~154 KB and ~308 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
2 hints, 0 missing preconnects
PASS
2 hints, 0 missing preconnects
Info::
Page uses 2 resource hint(s)

Current Resource Hints

preconnect
2
preload
—
dns-prefetch
—
prefetch
—

2 resource hints configured

A+
HTTP Caching
max-age=3600 (1 hour)
PASS
max-age=3600 (1 hour)
Info::
Cache-Control header is set
Got: max-age=3600
Info::
Effective TTL: 1 hour (max-age=3600)
Info::
ETag present — enables conditional (304) responses
Info::
Last-Modified header present
Cache-Control

max-age=3600

DirectiveValueMeaning
max-age3600Cache for 1 hour
Effective TTL: 3600 seconds
Network Waterfall
27 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
44% of JavaScript execution is third-party
First-party Third-party 3363ms · 156KB · $45/mo
Unattributable
Other
Costly
Execution 2904ms
Transfer 0 KB
Monthly Cost $39/mo
Google Tag Manager
Tag Manager
Costly
Execution 459ms
Transfer 156 KB
Unused 41%
Monthly Cost $6/mo

These scripts may cost more than they're worth

  • Unattributable adds 2904ms and costs ~$39/month
  • Google Tag Manager adds 459ms and costs ~$6/month

44% of JavaScript execution time comes from third-party scripts.

Why this matters

Third-party scripts (analytics, ads, social, A/B testing) often dominate execution time — every one is a perf-and-privacy tax.

Learn more ▾

Each third-party script is a black box: you don't control when it loads, what it executes, or how much it grows. They often account for a major share of total blocking time on average sites (HTTP Archive's Web Almanac documents the trend). Audit which ones you actually need, defer the rest, and use facade patterns (lite-youtube, lite-vimeo) for embedded media.

Source: web.dev / HTTP Archive Web Almanac

Unattributable takes 2904ms 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 459ms 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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