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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
83
GRADE
B
FIX
3
REVIEW
3
PASS
6
INFO
3

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

Mobile Desktop
81
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
100
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.
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.

1.29 s

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

2.50 s

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

105 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.

1.29 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.

2.50 s

Page Load Progression

499 ms
997 ms
1.5 s
2.0 s
2.5 s
3.0 s
3.5 s
4.0 s
Checks
15
6 PASS 3 REVIEW 3 FIX
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 (2.0 MiB of 2.0 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Bundles
Action
26 scripts, 857 KB unused
FIX
26 scripts, 857 KB unused
Warning::
https://static.xx.fbcdn.net/rsrc.php/v4iSJ94/yk/l/...: 161 KB unused (68%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://static.xx.fbcdn.net/rsrc.php/v4iYeD4/y6/l/...: 111 KB unused (48%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://static.xx.fbcdn.net/rsrc.php/v4ipTm4/yP/l/...: 97 KB unused (78%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://static.xx.fbcdn.net/rsrc.php/v4iWlL4/yL/l/...: 87 KB unused (93%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://static.xx.fbcdn.net/rsrc.php/v4/yU/r/DcrX2...: 76 KB unused (100%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 857 KB
857 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://static.xx.fbcdn.net/rsrc.php/v4iSJ94/yk/l/en_US-j/UXWe6ta71gPqq23lXnK5fQoXp1ulKXCcSB5F_b4nAKCxVZMhThmqKfNEV_mk9z3Hho4j4SE1-LXf20Tm3rCAOd1QY0YjxOowOmBiM-3juxcHXgcjLjB4EAFc5H3hHcoEf9nrw1JtOGoHMq0Th14Xk8e9Sku4yAsukPWHDC8lbkhBm8OT49U1YTT9NT_0Z9aRAvLoiQv4bLhpa--wr3g9q4pR78qLBHl-lElGzTHOl6Gkjq0OVeavkZc4HIHnCg4LyRJkkmesJZCcc2ZP1Mq8wypiAW_bfkF94AKekI-DNAdmh5DEndjkC1LYw5WWi7I.js238 KB161 KB (68%)✓3rd
https://static.xx.fbcdn.net/rsrc.php/v4iYeD4/y6/l/en_US-j/cab2CGxVJ7W.js229 KB111 KB (48%)✓3rd
https://static.xx.fbcdn.net/rsrc.php/v4ipTm4/yP/l/en_US-j/QfCA_ELSQ5VAjEdhn01I-R1X1fDgLCzDeWJukooR-9NvKOOokj7n-WwRi7mWBMSxEcOrwUWos8AmSmEnWJrIkZO1VIPNHOqVL96Xbo5ubbMbZsZIN72SS5MnT_uK3aPyME2r.js125 KB97 KB (78%)✓3rd
https://static.xx.fbcdn.net/rsrc.php/v4iWlL4/yL/l/en_US-j/WcAF9pLKoVt.js94 KB87 KB (93%)✓3rd
https://static.xx.fbcdn.net/rsrc.php/v4/yU/r/DcrX2w7W64E.js76 KB76 KB (100%)✓3rd
https://static.xx.fbcdn.net/rsrc.php/v4ie444/y7/l/en_US-j/fjWsYWETEN5.js66 KB60 KB (91%)✓3rd
https://static.xx.fbcdn.net/rsrc.php/v4iQnF4/yb/l/en_US-j/8nWC-okWq-s.js100 KB56 KB (56%)✓3rd
https://static.xx.fbcdn.net/rsrc.php/v4iDQn4/yS/l/en_US-j/eS845CZGYn2.js55 KB47 KB (85%)✓3rd
https://static.xx.fbcdn.net/rsrc.php/v4i1NA4/yw/l/en_US-j/Ju1IKP5Z_Ru.js49 KB40 KB (81%)✓3rd
https://static.xx.fbcdn.net/rsrc.php/v4/ym/r/D86XEw3a--O.js74 KB39 KB (52%)✓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
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.

C
Page Weight Budget
Action
2.0 MB transferred, 36 requests
REVIEW
2.0 MB transferred, 36 requests
Info::
Page weighs 7.3 MB (2.0 MB transferred)
Warning::
JavaScript is 1.2 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.2 MB
Info::
CSS is 299 KB — consider purging unused styles
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
Got: 299 KB
Info::
Fonts are 208 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 208 KB
Info::
36 HTTP requests
Info::
Estimated 0.42 g CO2 per page load
2.0 MB / 2.4 MB budget
2.0 MB transferred
36 requests
0.42 g CO2 per page load
JavaScript 1.2 MiB 61%
CSS 299.2 KiB 15%
Fonts 208.4 KiB 10%
Images 192.9 KiB 9%
HTML 85.4 KiB 4%
Other 20.1 KiB 1%
Other 622 B 0%
Other 224 B 0%
0 2.4 MB 4.9 MB
Approaching limit

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

Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.

Why this matters

CSS bundle is large — purge unused styles (PurgeCSS, Tailwind JIT) to reduce CSS payload.

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
JS Execution Cost
758ms total JS execution
REVIEW
758ms total JS execution
Warning::
https://static.xx.fbcdn.net/rsrc.php/v4/ym/r/D86XE...: 391ms CPU time
Info::
https://static.xx.fbcdn.net/rsrc.php/v4iQnF4/yb/l/...: 165ms CPU time
Info::
https://www.facebook.com/: 121ms CPU time
Info::
Unattributable: 82ms CPU time
Warning::
Third-party scripts: 758ms (100% of total)

Main Thread Breakdown

Script Evaluation 42% Other 25% Script Parsing & Compilation 19% Style & Layout 8% Parse HTML & CSS 4%
ScriptTotalScriptingParse/CompileParty
https://static.xx.fbcdn.net/rsrc.php/v4/ym/r/D86XEw3a--O.js391ms356ms24ms3rd
https://static.xx.fbcdn.net/rsrc.php/v4iQnF4/yb/l/en_US-j/8nWC-okWq-s.js165ms4ms12ms3rd
https://www.facebook.com/121ms8ms0ms3rd
Unattributable82ms6ms0ms3rd
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
2 images, 0 KB saveable
PASS
2 images, 0 KB saveable
Warning::
https://static.xx.fbcdn.net/rsrc.php/y0/r/U45qBJmW... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
2 images 193 KB
0 oversized -0 KB
0 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

A+
Font Loading
2 fonts (208 KB)
PASS
2 fonts (208 KB)
Info::
2 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

2

208 KB total

Render-blocking

0

of 2

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 1.3 s LCP 2.5 shttps://static.xx.fbcdn.net/rsrc.php/yl/r/9AJbVCy4-G1.woff29AJbVCy4-G1.woff2 https://static.xx.fbcdn.net/rsrc.php/yl/r/9AJbVCy4-G1.woff2 — 29.4 KiB — 0 ms — font-display: swaphttps://static.xx.fbcdn.net/rsrc.php/yQ/r/-pkMfchyeAZ.woff2-pkMfchyeAZ.woff2 https://static.xx.fbcdn.net/rsrc.php/yQ/r/-pkMfchyeAZ.woff2 — 179.1 KiB — 0 ms — font-display: swap
9AJbVCy4-G1.woff2 woff2 swap
Size 29 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
-pkMfchyeAZ.woff2 woff2 swap
Size 179 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 ~90 KB and ~180 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
Network Waterfall
36 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 758ms · 260KB · $10/mo
static.xx.fbcdn.net
Other
Costly
Execution 391ms
Transfer 74 KB
Unused 52%
Monthly Cost $5/mo
static.xx.fbcdn.net
Other
Optional
Execution 165ms
Transfer 100 KB
Unused 56%
Monthly Cost $2/mo
www.facebook.com
Other
Optional
Execution 121ms
Transfer 85 KB
Monthly Cost $2/mo
Unattributable
Other
Optional
Execution 82ms
Transfer 0 KB
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • static.xx.fbcdn.net adds 391ms 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

static.xx.fbcdn.net takes 391ms 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

52% of static.xx.fbcdn.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

56% of static.xx.fbcdn.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

How third-party costs are calculated

Real-User Performance (CrUX)
Field metrics from the Chrome User Experience Report
INFO

Chrome User Experience (CrUX)

Real-user metrics from the Chrome UX Report (2026-03-11 — 2026-04-07)

LCP (p75)

681 ms

96% good

INP (p75)

24 ms

92% good

CLS (p75)

0.000

100% good

FCP (p75)

681 ms

TTFB (p75)

570 ms

This origin passes Core Web Vitals assessment
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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