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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
83
GRADE
B
FIX
3
REVIEW
3
PASS
8
INFO
3

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

Mobile Desktop
50
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
80
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.

6.02 s

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

7.94 s

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

432 ms

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

0.022

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

6.02 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.

9.77 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
17
8 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 (903.9 KiB of 904.1 KiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Execution Cost
Action
2278ms total JS execution
FIX
2278ms total JS execution
Warning::
https://z-m-static.xx.fbcdn.net/rsrc.php/v4/yR/r/g...: 654ms CPU time
Warning::
https://m.facebook.com/ig/login_via/app/?lid=1ZyaS...: 519ms CPU time
Warning::
https://z-m-static.xx.fbcdn.net/rsrc.php/v4/y7/r/x...: 467ms CPU time
Warning::
Unattributable: 348ms CPU time
Info::
https://z-m-static.xx.fbcdn.net/rsrc.php/v4/yN/r/P...: 91ms CPU time
Warning::
Third-party scripts: 2278ms (100% of total)

Main Thread Breakdown

Script Evaluation 55% Other 18% Script Parsing & Compilation 15% Style & Layout 7%
ScriptTotalScriptingParse/CompileParty
https://z-m-static.xx.fbcdn.net/rsrc.php/v4/yR/r/g2ZaHD-GDwx.js654ms457ms112ms3rd
https://m.facebook.com/ig/login_via/app/?lid=1ZyaSLfke7IbvuoCx&bn=Y29tLmFuZHJvaWQuY2hyb21l&tade=Q7fLBQFqe0EAVn3tgaIGv8RXFOq9jkBUtGUDnp%2B%2Fghc%2BtYWV4N0UshQwMl5CU3pXpBmSTSeTuMlHDJH0CJFyhEMEj3bKAlwjGCSbk8CYwPD8f1EWiqkPjuFe73l9M0Zc375yz8p%2FKg%3D%3D519ms272ms59ms3rd
https://z-m-static.xx.fbcdn.net/rsrc.php/v4/y7/r/xtQcZ7ngAFd.js467ms335ms75ms3rd
Unattributable348ms27ms0ms3rd
https://z-m-static.xx.fbcdn.net/rsrc.php/v4/yN/r/PTIcotwBK8l.js91ms83ms6ms3rd
https://z-m-static.xx.fbcdn.net/rsrc.php/v4iLl54/yI/l/en_US-j/PGkgmDG_Xd0.js83ms72ms7ms3rd
https://z-m-static.xx.fbcdn.net/rsrc.php/v4iczx4/yi/l/en_US-j/f2S8cvI5JnB.js61ms13ms27ms3rd
https://z-m-static.xx.fbcdn.net/rsrc.php/v4/yo/r/1c5BvaDlz8l.js56ms8ms46ms3rd
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
Image Optimization
Action
9 images, 0 KB saveable
REVIEW
9 images, 0 KB saveable
Warning::
https://z-m-static.xx.fbcdn.net/rsrc.php/yh/r/iXKR... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://z-m-static.xx.fbcdn.net/rsrc.php/ys/r/lBaB... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://z-m-static.xx.fbcdn.net/rsrc.php/yS/r/kHeV... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://z-m-static.xx.fbcdn.net/rsrc.php/yU/r/0gFm... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
9 images 4 KB
0 oversized -0 KB
4 legacy format
4 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

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

C
JS Bundles
Action
23 scripts, 232 KB unused
REVIEW
23 scripts, 232 KB unused
Warning::
https://z-m-static.xx.fbcdn.net/rsrc.php/v4/yR/r/g...: 92 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://z-m-static.xx.fbcdn.net/rsrc.php/v4/yo/r/1...: 67 KB unused (74%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://z-m-static.xx.fbcdn.net/rsrc.php/v4iczx4/y...: 38 KB unused (74%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://z-m-static.xx.fbcdn.net/rsrc.php/v4/y7/r/x...: 33 KB unused (47%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 232 KB
232 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://z-m-static.xx.fbcdn.net/rsrc.php/v4/yR/r/g2ZaHD-GDwx.js190 KB92 KB (49%)✓3rd
https://z-m-static.xx.fbcdn.net/rsrc.php/v4/yo/r/1c5BvaDlz8l.js91 KB67 KB (74%)✓3rd
https://z-m-static.xx.fbcdn.net/rsrc.php/v4iczx4/yi/l/en_US-j/f2S8cvI5JnB.js52 KB38 KB (74%)✓3rd
https://z-m-static.xx.fbcdn.net/rsrc.php/v4/y7/r/xtQcZ7ngAFd.js70 KB33 KB (47%)✓3rd
https://z-m-static.xx.fbcdn.net/rsrc.php/v4/yY/r/w_zXWwkDai5.js2 KB—✓3rd
https://www.googletagmanager.com/gtag/js?id=AW-1032622309142 KB—✓3rd
https://z-m-static.xx.fbcdn.net/rsrc.php/v4/yu/r/3M28pRZAj9B.js0 KB—✓3rd
https://z-m-static.xx.fbcdn.net/rsrc.php/v4/yJ/r/T-cu1f83Bjy.js0 KB—✓3rd
https://z-m-static.xx.fbcdn.net/rsrc.php/v4/yg/r/OqUIcVN3AQO.js0 KB—✓3rd
https://z-m-static.xx.fbcdn.net/rsrc.php/v4/yX/r/34X2YpLaKen.js0 KB—✓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

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

Green Hosting

No green hosting detected

A
Page Weight Budget
904 KB transferred, 64 requests
PASS
904 KB transferred, 64 requests
Info::
Page weighs 2.7 MB (904 KB transferred)
Warning::
JavaScript is 627 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 627 KB
Info::
Fonts are 201 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 201 KB
Info::
64 HTTP requests
Info::
Estimated 0.19 g CO2 per page load
904 KB / 2.4 MB budget
904 KB transferred
64 requests
0.19 g CO2 per page load
JavaScript 626.8 KiB 69%
Fonts 201.3 KiB 22%
HTML 51.9 KiB 6%
CSS 10.8 KiB 1%
Images 5.4 KiB 1%
Other 4.0 KiB 0%
Other 2.2 KiB 0%
Other 1.1 KiB 0%
Other 677 B 0%
Other 82 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

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
2 fonts (201 KB)
PASS
2 fonts (201 KB)
Info::
2 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

2

201 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 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s 8.0 s FCP 6.0 s LCP 7.9 shttps://z-m-static.xx.fbcdn.net/rsrc.php/y2/r/6YirsaXqsap.woff26YirsaXqsap.woff2 https://z-m-static.xx.fbcdn.net/rsrc.php/y2/r/6YirsaXqsap.woff2 — 22.2 KiB — 0 ms — font-display: swaphttps://z-m-static.xx.fbcdn.net/rsrc.php/yQ/r/-pkMfchyeAZ.woff2-pkMfchyeAZ.woff2 https://z-m-static.xx.fbcdn.net/rsrc.php/yQ/r/-pkMfchyeAZ.woff2 — 179.1 KiB — 0 ms — font-display: swap
6YirsaXqsap.woff2 woff2 swap
Size 22 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
14 hints, 0 missing preconnects
PASS
14 hints, 0 missing preconnects
Info::
Page uses 14 resource hint(s)

Current Resource Hints

preconnect
—
preload
+4
14
dns-prefetch
—
prefetch
—

14 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
64 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 2278ms · 480KB · $30/mo
z-m-static.xx.fbcdn.net
Other
Costly
Execution 654ms
Transfer 190 KB
Unused 49%
Monthly Cost $9/mo
m.facebook.com
Other
Costly
Execution 519ms
Transfer 51 KB
Monthly Cost $7/mo
z-m-static.xx.fbcdn.net
Other
Costly
Execution 467ms
Transfer 70 KB
Unused 47%
Monthly Cost $6/mo
Unattributable
Other
Costly
Execution 348ms
Transfer 0 KB
Monthly Cost $5/mo
z-m-static.xx.fbcdn.net
Other
Optional
Execution 91ms
Transfer 10 KB
Monthly Cost $1/mo
z-m-static.xx.fbcdn.net
Other
Optional
Execution 83ms
Transfer 15 KB
Monthly Cost $1/mo
z-m-static.xx.fbcdn.net
Other
Optional
Execution 61ms
Transfer 52 KB
Unused 74%
Monthly Cost $1/mo
z-m-static.xx.fbcdn.net
Other
Optional
Execution 56ms
Transfer 91 KB
Unused 74%
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • z-m-static.xx.fbcdn.net adds 654ms and costs ~$9/month
  • m.facebook.com adds 519ms and costs ~$7/month
  • z-m-static.xx.fbcdn.net adds 467ms and costs ~$6/month
  • Unattributable adds 348ms 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

z-m-static.xx.fbcdn.net takes 654ms 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

m.facebook.com takes 519ms 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

z-m-static.xx.fbcdn.net takes 467ms 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 348ms 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

74% of z-m-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

74% of z-m-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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