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

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.

4.98 s

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

6.57 s

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

5.97 s

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

0.012

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

11.42 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.

23.76 s

Page Load Progression

921 ms

1.8 s

2.8 s

3.7 s

4.6 s

5.5 s

6.4 s

7.4 s

Checks

7 PASS 2 REVIEW 6 FIX

Page Weight Budget

Action

3.4 MB transferred, 129 requests

FIX

3.4 MB transferred, 129 requests

Page weighs 8.5 MB (3.4 MB transferred)

JavaScript is 1.8 MB — consider code splitting or lazy loading

Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.

Got: 1.8 MB

Fonts are 307 KB — consider subsetting or using system fonts

Subset fonts to include only used characters, or switch to system font stacks.

Got: 307 KB

CSS is 285 KB — consider purging unused styles

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

Got: 285 KB

129 HTTP requests — consider bundling or reducing

Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.

Estimated 0.71 g CO2 per page load

3.4 MB transferred

129 requests

0.71 g CO2 per page load

JavaScript 1.8 MiB 53%

Images 958.3 KiB 28%

Fonts 307.5 KiB 9%

CSS 285.5 KiB 8%

HTML 42.8 KiB 1%

Other 24.9 KiB 1%

Other 19.6 KiB 1%

Other 1.1 KiB 0%

Other 611 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

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

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

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 (3.4 MiB of 3.4 MiB)

Third-party blocking time is low (0 ms)

100%

First-party Third-party

JS Execution Cost

Action

11034ms total JS execution

FIX

11034ms total JS execution

https://www.thejakartapost.com/: 5098ms CPU time

https://securepubads.g.doubleclick.net/pagead/mana...: 866ms CPU time

Unattributable: 596ms CPU time

https://www.googletagmanager.com/gtm.js?id=GTM-NS4...: 432ms CPU time

https://www.googletagmanager.com/gtag/js?id=AW-108...: 429ms CPU time

Third-party scripts: 11034ms (100% of total)

Main Thread Breakdown

Script Evaluation 71% Other 10% Style & Layout 8% Script Parsing & Compilation 7%

Script	Total	Scripting	Parse/Compile	Party
https://www.thejakartapost.com/	5098ms	4104ms	10ms	3rd
https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604200101/pubads_impl.js?cb=31097964	866ms	711ms	76ms	3rd
Unattributable	596ms	39ms	0ms	3rd
https://www.googletagmanager.com/gtm.js?id=GTM-NS42SPD	432ms	352ms	73ms	3rd
https://www.googletagmanager.com/gtag/js?id=AW-10875544705	429ms	338ms	69ms	3rd
https://www.googletagmanager.com/gtag/js?id=G-VR9N6BE2RS&cx=c&gtm=4e64k0h1	401ms	333ms	64ms	3rd
https://pagead2.googlesyndication.com/pagead/managed/js/adsense/m202604170101/show_ads_impl_fy2021.js	397ms	284ms	77ms	3rd
https://www.thejakartapost.com/skin/js/lazysizes.min.js	342ms	164ms	1ms	3rd
https://www.googletagmanager.com/gtag/js?id=G-QXHTKB3WGB&cx=c&_slc=1	338ms	267ms	67ms	3rd
https://fundingchoicesmessages.google.com/i/ca-pub-7767446638291741?href=https%3A%2F%2Fwww.thejakartapost.com&ers=2	320ms	253ms	27ms	3rd

Showing top 10 of 23 scripts

JS Bundles

Action

47 scripts, 738 KB unused

FIX

47 scripts, 738 KB unused

https://pagead2.googlesyndication.com/pagead/manag...: 134 KB unused (75%)

Consider code splitting or tree shaking to reduce unused code.

https://securepubads.g.doubleclick.net/pagead/mana...: 110 KB unused (59%)

Consider code splitting or tree shaking to reduce unused code.

https://accounts.google.com/gsi/client: 80 KB unused (83%)

Consider code splitting or tree shaking to reduce unused code.

https://www.googletagmanager.com/gtag/js?id=G-QXHT...: 68 KB unused (41%)

Consider code splitting or tree shaking to reduce unused code.

https://www.googletagmanager.com/gtag/js?id=G-VR9N...: 60 KB unused (36%)

Consider code splitting or tree shaking to reduce unused code.

Total unused JavaScript: 738 KB

738 KB unused JavaScript

Downloaded but never executed on this page.

Script	Size	Unused	Minified	Party
https://pagead2.googlesyndication.com/pagead/managed/js/adsense/m202604170101/show_ads_impl_fy2021.js	178 KB	134 KB (75%)	✓	3rd
https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604200101/pubads_impl.js?cb=31097964	188 KB	110 KB (59%)	✓	3rd
https://accounts.google.com/gsi/client	96 KB	80 KB (83%)	✓	3rd
https://www.googletagmanager.com/gtag/js?id=G-QXHTKB3WGB&cx=c&_slc=1	167 KB	68 KB (41%)	✓	3rd
https://www.googletagmanager.com/gtag/js?id=G-VR9N6BE2RS&cx=c&gtm=4e64k0h1	170 KB	60 KB (36%)	✓	3rd
https://www.googletagmanager.com/gtm.js?id=GTM-NS42SPD	166 KB	59 KB (36%)	✓	3rd
https://www.googletagmanager.com/gtag/js?id=AW-10875544705	147 KB	52 KB (35%)	✓	3rd
https://news.google.com/swg/js/v1/swg.js	71 KB	47 KB (69%)	✓	3rd
https://fundingchoicesmessages.google.com/i/ca-pub-7767446638291741?href=https%3A%2F%2Fwww.thejakartapost.com&ers=2	70 KB	36 KB (52%)	✓	3rd
https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js?client=ca-pub-7767446638291741	54 KB	32 KB (58%)	✓	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

Page Weight Inventory

Action

129 resources · 3.4 MB · 738 KB savings available

FIX

129 resources · 3.4 MB · 738 KB savings available

Page weight 2.4 MB over 1MB target

Got: 3.4 MB Expected: ≤ 1 MB

~738 KB of savings available

128 third-party resources (100% of weight)

1 resources over 200KB

129 resources · 3.4 MiB · 128 third-party 2.4 MiB over 1MB target

JavaScript 53% · 1.8 MiB

Image 28% · 959.8 KiB

Font 9% · 307.5 KiB

CSS 8% · 285.5 KiB

Document 1% · 43.2 KiB

Other 1% · 41.4 KiB

~738.3 KiB of savings available

Remove unused JavaScript: 738.3 KiB

#	Resource	Type	Size	Cache	Unused	3rd party	Issues

129 resources			3.4 MiB

HTTP Caching

Action

No cache headers

FIX

No cache headers

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.

Image Optimization

26 images, 0 KB saveable

REVIEW

26 images, 0 KB saveable

All images are well-optimized

26 images 958 KB

0 oversized -0 KB

26 legacy format

0 missing dimensions CLS risk

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

All text resources are properly compressed.

A+

Font Loading

9 fonts (307 KB)

PASS

9 fonts (307 KB)

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

Web fonts

307 KB total

Render-blocking

of 9

Dominant font-display

swap

Most common across fonts

Font loading timeline

Transfer FOIT (block) FOUT (swap)

lato-v20-latin-regular.... woff2 swap

Size 23 KB

Load time 1.0 s

Start 4.0 s

Risk FOUT — text flashes from fallback to web font

lora-v35-latin_latin-ex... woff2 swap

Size 29 KB

Load time 975 ms

Start 4.0 s

Risk FOUT — text flashes from fallback to web font

fa-solid-900.woff2 woff2 swap

Size 62 KB

Load time 399 ms

Start 4.0 s

Risk FOUT — text flashes from fallback to web font

lato-v20-latin-700.woff2 woff2 swap

Size 23 KB

Load time 986 ms

Start 4.0 s

Risk FOUT — text flashes from fallback to web font

lora-v35-latin_latin-ex... woff2 swap

Size 28 KB

Load time 1.0 s

Start 4.1 s

Risk FOUT — text flashes from fallback to web font

lora-v35-latin_latin-ex... woff2 swap

Size 29 KB

Load time 983 ms

Start 4.1 s

Risk FOUT — text flashes from fallback to web font

lato-v20-latin-900.woff2 woff2 swap

Size 23 KB

Load time 989 ms

Start 4.1 s

Risk FOUT — text flashes from fallback to web font

lora-v35-latin_latin-ex... woff2 swap

Size 28 KB

Load time 974 ms

Start 4.1 s

Risk FOUT — text flashes from fallback to web font

fa-brands-400.woff2 woff2 swap

Size 63 KB

Load time 1.3 s

Start 4.1 s

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

No optimization needed

PASS

No optimization needed

No resource hint issues

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

Network Waterfall

129 requests over 8214ms

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 11034ms · 1897KB · $146/mo

Script	Category	Execution	Transfer	Unused	Monthly Cost	Verdict
www.thejakartapost.com www.thejakartapost.com	Other	5098ms	29 KB	—	$68/mo	Costly
securepubads.g.doubleclick.net securepubads.g.doubleclick.net	Other	866ms	188 KB	59%	$12/mo	Costly
Unattributable Unattributable	Other	596ms	0 KB	—	$8/mo	Costly
Google Tag Manager www.googletagmanager.com	Tag Manager	432ms	166 KB	36%	$6/mo	Costly
Google Tag Manager www.googletagmanager.com	Tag Manager	429ms	147 KB	35%	$6/mo	Costly
Google Tag Manager www.googletagmanager.com	Tag Manager	401ms	170 KB	36%	$5/mo	Costly
pagead2.googlesyndication.com pagead2.googlesyndication.com	Other	397ms	178 KB	75%	$5/mo	Costly
www.thejakartapost.com www.thejakartapost.com	Other	342ms	5 KB	—	$5/mo	Costly
Google Tag Manager www.googletagmanager.com	Tag Manager	338ms	167 KB	41%	$4/mo	Costly
fundingchoicesmessages.google.com fundingchoicesmessages.google.com	Other	320ms	70 KB	52%	$4/mo	Costly
static.chartbeat.com static.chartbeat.com	Other	275ms	16 KB	—	$4/mo	Costly
www.thejakartapost.com www.thejakartapost.com	Other	235ms	36 KB	—	$3/mo	Costly
Facebook Pixel connect.facebook.net	Advertising	234ms	47 KB	—	$3/mo	Costly
appleid.cdn-apple.com appleid.cdn-apple.com	Other	221ms	17 KB	—	$3/mo	Costly
Facebook Pixel connect.facebook.net	Advertising	173ms	97 KB	31%	$2/mo	Optional
www.thejakartapost.com www.thejakartapost.com	Other	128ms	49 KB	63%	$2/mo	Optional
pagead2.googlesyndication.com pagead2.googlesyndication.com	Other	111ms	54 KB	58%	$1/mo	Optional
securepubads.g.doubleclick.net securepubads.g.doubleclick.net	Other	94ms	34 KB	—	$1/mo	Optional
www.thejakartapost.com www.thejakartapost.com	Other	86ms	230 KB	—	$1/mo	Optional
Google Analytics www.google-analytics.com	Analytics	77ms	21 KB	—	$1/mo	Optional
accounts.google.com accounts.google.com	Other	67ms	96 KB	83%	$1/mo	Optional
static.chartbeat.com static.chartbeat.com	Other	62ms	10 KB	—	$1/mo	Optional
news.google.com news.google.com	Other	52ms	71 KB	69%	$1/mo	Optional

www.thejakartapost.com

Other

Costly

Execution 5098ms

Transfer 29 KB

Monthly Cost $68/mo

securepubads.g.doubleclick.net

Other

Costly

Execution 866ms

Transfer 188 KB

Unused 59%

Monthly Cost $12/mo

Unattributable

Other

Costly

Execution 596ms

Transfer 0 KB

Monthly Cost $8/mo

Google Tag Manager

Tag Manager

Costly

Execution 432ms

Transfer 166 KB

Unused 36%

Monthly Cost $6/mo

Google Tag Manager

Tag Manager

Costly

Execution 429ms

Transfer 147 KB

Unused 35%

Monthly Cost $6/mo

Google Tag Manager

Tag Manager

Costly

Execution 401ms

Transfer 170 KB

Unused 36%

Monthly Cost $5/mo

pagead2.googlesyndication.com

Other

Costly

Execution 397ms

Transfer 178 KB

Unused 75%

Monthly Cost $5/mo

www.thejakartapost.com

Other

Costly

Execution 342ms

Transfer 5 KB

Monthly Cost $5/mo

Google Tag Manager

Tag Manager

Costly

Execution 338ms

Transfer 167 KB

Unused 41%

Monthly Cost $4/mo

fundingchoicesmessages.google.com

Other

Costly

Execution 320ms

Transfer 70 KB

Unused 52%

Monthly Cost $4/mo

static.chartbeat.com

Other

Costly

Execution 275ms

Transfer 16 KB

Monthly Cost $4/mo

www.thejakartapost.com

Other

Costly

Execution 235ms

Transfer 36 KB

Monthly Cost $3/mo

Facebook Pixel

Advertising

Costly

Execution 234ms

Transfer 47 KB

Monthly Cost $3/mo

appleid.cdn-apple.com

Other

Costly

Execution 221ms

Transfer 17 KB

Monthly Cost $3/mo

Facebook Pixel

Advertising

Optional

Execution 173ms

Transfer 97 KB

Unused 31%

Monthly Cost $2/mo

www.thejakartapost.com

Other

Optional

Execution 128ms

Transfer 49 KB

Unused 63%

Monthly Cost $2/mo

pagead2.googlesyndication.com

Other

Optional

Execution 111ms

Transfer 54 KB

Unused 58%

Monthly Cost $1/mo

securepubads.g.doubleclick.net

Other

Optional

Execution 94ms

Transfer 34 KB

Monthly Cost $1/mo

www.thejakartapost.com

Other

Optional

Execution 86ms

Transfer 230 KB

Monthly Cost $1/mo

Google Analytics

Analytics

Optional

Execution 77ms

Transfer 21 KB

Monthly Cost $1/mo

accounts.google.com

Other

Optional

Execution 67ms

Transfer 96 KB

Unused 83%

Monthly Cost $1/mo

static.chartbeat.com

Other

Optional

Execution 62ms

Transfer 10 KB

Monthly Cost $1/mo

news.google.com

Other

Optional

Execution 52ms

Transfer 71 KB

Unused 69%

Monthly Cost $1/mo

These scripts may cost more than they're worth

www.thejakartapost.com adds 5098ms and costs ~$68/month
securepubads.g.doubleclick.net adds 866ms and costs ~$12/month
Unattributable adds 596ms and costs ~$8/month
Google Tag Manager adds 432ms and costs ~$6/month
Google Tag Manager adds 429ms and costs ~$6/month
Google Tag Manager adds 401ms and costs ~$5/month
pagead2.googlesyndication.com adds 397ms and costs ~$5/month
www.thejakartapost.com adds 342ms and costs ~$5/month
Google Tag Manager adds 338ms and costs ~$4/month
fundingchoicesmessages.google.com adds 320ms and costs ~$4/month
static.chartbeat.com adds 275ms and costs ~$4/month
www.thejakartapost.com adds 235ms and costs ~$3/month
Facebook Pixel adds 234ms and costs ~$3/month
appleid.cdn-apple.com adds 221ms and costs ~$3/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.thejakartapost.com takes 5098ms 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

securepubads.g.doubleclick.net takes 866ms 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

59% of securepubads.g.doubleclick.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

Unattributable takes 596ms 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 432ms 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 429ms 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 401ms 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

pagead2.googlesyndication.com takes 397ms 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

75% of pagead2.googlesyndication.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

www.thejakartapost.com takes 342ms 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 338ms 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

fundingchoicesmessages.google.com takes 320ms 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 fundingchoicesmessages.google.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

static.chartbeat.com takes 275ms 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.thejakartapost.com takes 235ms 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

Facebook Pixel takes 234ms 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

appleid.cdn-apple.com takes 221ms 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

63% of www.thejakartapost.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 pagead2.googlesyndication.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

83% of accounts.google.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

69% of news.google.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.