Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.

SCORE

GRADE

FIX

REVIEW

PASS

INFO

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

Mobile Desktop

Performance

Accessibility

100

Best Practices

SEO

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

2.89 s

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

3.12 s

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

50 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.

2.89 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.

3.88 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

11 PASS 3 REVIEW 1 FIX

Third-Party Impact

Action

100% third-party, 0 ms blocking

FIX

100% third-party, 0 ms blocking

Third-party code accounts for 100% of page weight (249.5 KiB of 250.0 KiB)

Third-party blocking time is low (0 ms)

100%

First-party Third-party

Image Optimization

8 images, 0 KB saveable

REVIEW

8 images, 0 KB saveable

https://fonts.gstatic.com/s/i/productlogos/googleg... is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

8 images 7 KB

0 oversized -0 KB

3 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

JS Execution Cost

Action

1212ms total JS execution

REVIEW

1212ms total JS execution

https://www.google.com.hk/: 711ms CPU time

Unattributable: 294ms CPU time

https://www.gstatic.com/og/_/js/k=og.qtm.en_US.6_f...: 207ms CPU time

Third-party scripts: 1212ms (100% of total)

Main Thread Breakdown

Script Evaluation 34% Other 29% Style & Layout 18% Script Parsing & Compilation 9% Parse HTML & CSS 8%

Script	Total	Scripting	Parse/Compile	Party
https://www.google.com.hk/	711ms	246ms	69ms	3rd
Unattributable	294ms	14ms	0ms	3rd
https://www.gstatic.com/og/_/js/k=og.qtm.en_US.6_fIyx0zU_k.2019.O/rt=j/m=qabr,q_dnp,qcwid,qapid,qads/exm=qaaw,qadd,qaid,qein,qhaw,qhba,qhbr,qhch,qhga,qhid,qhin/d=1/ed=1/rs=AA2YrTvzGBfyZkuuYhx9qfMvTsWaK1RzSA	207ms	145ms	43ms	3rd

JS Bundles

1 scripts, 54 KB unused

REVIEW

1 scripts, 54 KB unused

https://www.gstatic.com/og/_/js/k=og.qtm.en_US.6_f...: 54 KB unused (67%)

Consider code splitting or tree shaking to reduce unused code.

Total unused JavaScript: 54 KB

54 KB unused JavaScript

Downloaded but never executed on this page.

Script	Size	Unused	Minified	Party
https://www.gstatic.com/og/_/js/k=og.qtm.en_US.6_fIyx0zU_k.2019.O/rt=j/m=qabr,q_dnp,qcwid,qapid,qads/exm=qaaw,qadd,qaid,qein,qhaw,qhba,qhbr,qhch,qhga,qhid,qhin/d=1/ed=1/rs=AA2YrTvzGBfyZkuuYhx9qfMvTsWaK1RzSA	80 KB	54 KB (67%)	✓	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

A+

Page Weight Budget

250 KB transferred, 28 requests

PASS

250 KB transferred, 28 requests

Page weighs 719 KB (250 KB transferred)

28 HTTP requests

Estimated 0.05 g CO2 per page load

250 KB transferred

28 requests

0.05 g CO2 per page load

JavaScript 79.7 KiB 32%

HTML 76.8 KiB 31%

Other 58.1 KiB 23%

Fonts 24.0 KiB 10%

Images 7.3 KiB 3%

CSS 3.7 KiB 1%

Other 362 B 0%

Other 60 B 0%

Other 0 B 0%

0 2.4 MB 4.9 MB

Under budget

A+

Text Compression

All text resources are compressed

PASS

All text resources are compressed

All text resources are properly compressed.

A+

Font Loading

1 fonts (24 KB)

PASS

1 fonts (24 KB)

1 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

24 KB total

Render-blocking

of 1

Dominant font-display

swap

Most common across fonts

Font loading timeline

Transfer FOIT (block) FOUT (swap)

4UaRrENHsxJlGDuGo1OIlJf... woff2 swap

Size 24 KB

Load time 9 ms

Start 208 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)

A+

Resource Caching

All resources properly cached

PASS

All resources properly cached

No caching issues found

All static resources have appropriate caching headers.

A+

Critical Rendering Path

No render-blocking resources

PASS

No render-blocking resources

No render-blocking resources detected

A+

Resource Hints

2 hints, 0 missing preconnects

PASS

2 hints, 0 missing preconnects

Page uses 2 resource hint(s)

Current Resource Hints

preconnect

—

preload

dns-prefetch

—

prefetch

—

2 resource hints configured

Page Weight Inventory

28 resources · 250 KB · 54 KB savings available

PASS

28 resources · 250 KB · 54 KB savings available

Within 1MB page-weight target

Got: 250 KB

~54 KB of savings available

27 third-party resources (100% of weight)

28 resources · 250.0 KiB · 27 third-party Within 1MB page-weight target

JavaScript 32% · 79.7 KiB

Document 31% · 77.4 KiB

Other 21% · 53.1 KiB

Font 10% · 24.0 KiB

Image 5% · 12.1 KiB

CSS 1% · 3.7 KiB

~53.5 KiB of savings available

Remove unused JavaScript: 53.5 KiB

#	Resource	Type	Size	Cache	Unused	3rd party	Issues

28 resources			250.0 KiB

A+

Render-Blocking Resources

No render-blocking resources detected

PASS

No render-blocking resources detected

No render-blocking resources detected in <head>

A+

Third-Party Resources

No third-party resources detected

PASS

No third-party resources detected

A+

Green Hosting

Whether the site is served from green-energy infrastructure

PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Google Cloud

HTTP Caching

max-age=2592000 (4 weeks)

PASS

max-age=2592000 (4 weeks)

Cache-Control header is set

Got: public, max-age=2592000

Effective TTL: 4 weeks (max-age=2592000)

No ETag or Last-Modified header

Conditional requests (304 Not Modified) are not possible without validators.

Cache-Control

public, max-age=2592000

Directive	Value	Meaning
public	—	Any cache may store this response
max-age	2592000	Cache for 4 weeks

Effective TTL: 2592000 seconds

Network Waterfall

28 requests over 1501ms

INFO

HTML JavaScript CSS Images Fonts XHR/Fetch Other

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 1212ms · 157KB · HK$90/mo

Script	Category	Execution	Transfer	Unused	Monthly Cost	Verdict
www.google.com.hk www.google.com.hk	Other	711ms	77 KB	—	HK$53/mo	Costly
Unattributable Unattributable	Other	294ms	0 KB	—	HK$22/mo	Costly
www.gstatic.com www.gstatic.com	Other	207ms	80 KB	67%	HK$15/mo	Costly

www.google.com.hk

Other

Costly

Execution 711ms

Transfer 77 KB

Monthly Cost HK$53/mo

Unattributable

Other

Costly

Execution 294ms

Transfer 0 KB

Monthly Cost HK$22/mo

www.gstatic.com

Other

Costly

Execution 207ms

Transfer 80 KB

Unused 67%

Monthly Cost HK$15/mo

These scripts may cost more than they're worth

www.google.com.hk adds 711ms and costs ~HK$53/month
Unattributable adds 294ms and costs ~HK$22/month
www.gstatic.com adds 207ms and costs ~HK$15/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

www.google.com.hk takes 711ms 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 294ms 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

www.gstatic.com takes 207ms 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

67% of www.gstatic.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

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.