Performance
· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.Performance-focused optimization plan with CWV assessment, top offenders, and time estimates
First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.
2.14 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
2.47 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
1.10 s
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.013
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
3.99 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.
5.74 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 sFPage Weight BudgetAction4.2 MB transferred, 136 requestsFIX
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
JavaScript bundle is large — code-split routes and lazy-load off-screen components to defer.
Source: web.dev
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.
Source: web.dev
Subset fonts to include only used characters, or switch to system font stacks.
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.
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.
High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.
Source: web.dev
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
DJS Execution CostAction2720ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.thejakartapost.com/ | 1412ms | 1038ms | 2ms | 3rd |
| https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604160201/pubads_impl.js | 236ms | 204ms | 19ms | 3rd |
| Unattributable | 170ms | 5ms | 0ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=AW-10875544705 | 110ms | 86ms | 17ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-NS42SPD | 102ms | 81ms | 18ms | 3rd |
| https://fundingchoicesmessages.google.com/i/ca-pub-7767446638291741?href=https%3A%2F%2Fwww.thejakartapost.com&ers=2 | 100ms | 71ms | 7ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-VR9N6BE2RS&cx=c>m=4e64k0h1 | 98ms | 80ms | 16ms | 3rd |
| https://www.thejakartapost.com/skin/js/lazysizes.min.js | 88ms | 46ms | 0ms | 3rd |
| https://www.thejakartapost.com/skin/js/jquery.min.js | 88ms | 48ms | 3ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-QXHTKB3WGB&cx=c&_slc=1 | 82ms | 65ms | 16ms | 3rd |
Showing top 10 of 14 scripts
FJS BundlesAction47 scripts, 740 KB unusedFIX
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?bust=31097971 | 178 KB | 133 KB (75%) | ✓ | 3rd |
| https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604160201/pubads_impl.js | 188 KB | 109 KB (58%) | ✓ | 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 | 69 KB (42%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-VR9N6BE2RS&cx=c>m=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 | 54 KB (37%) | ✓ | 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 | 31 KB (58%) | ✓ | 3rd |
Consider code splitting or tree shaking to reduce unused code.
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.
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.
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.
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.
This bundle has high unused code — code-split or tree-shake to ship only what executes.
Source: web.dev / Lighthouse coverage
FPage Weight InventoryAction136 resources · 4.2 MB · 740 KB savings availableFIX
~740.2 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 136 resources | 4.2 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
BImage Optimization31 images, 0 KB saveableREVIEW
CGreen HostingActionWhether the site is served from green-energy infrastructureREVIEW
Green Hosting
No green hosting detected
A+Text CompressionAll text resources are compressedPASS
A+Font Loading11 fonts (357 KB)PASS
Web fonts
11
357 KB total
Render-blocking
0
of 11
Dominant font-display
swap
Most common across fonts
Font loading timeline
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 CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource HintsNo optimization neededPASS
Network Waterfall136 requests over 7868msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.thejakartapost.com www.thejakartapost.com | Other | 1412ms | 29 KB | — | $19/mo | Costly |
securepubads.g.doubleclick.net securepubads.g.doubleclick.net | Other | 236ms | 188 KB | 58% | $3/mo | Costly |
Unattributable Unattributable | Other | 170ms | 0 KB | — | $2/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 110ms | 147 KB | 37% | $1/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 102ms | 166 KB | 36% | $1/mo | Optional |
fundingchoicesmessages.google.com fundingchoicesmessages.google.com | Other | 100ms | 70 KB | 52% | $1/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 98ms | 170 KB | 36% | $1/mo | Optional |
www.thejakartapost.com www.thejakartapost.com | Other | 88ms | 5 KB | — | $1/mo | Optional |
www.thejakartapost.com www.thejakartapost.com | Other | 88ms | 36 KB | — | $1/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 82ms | 167 KB | 42% | $1/mo | Optional |
pagead2.googlesyndication.com pagead2.googlesyndication.com | Other | 81ms | 178 KB | 75% | $1/mo | Optional |
static.chartbeat.com static.chartbeat.com | Other | 52ms | 16 KB | — | $1/mo | Optional |
appleid.cdn-apple.com appleid.cdn-apple.com | Other | 51ms | 17 KB | — | $1/mo | Optional |
Facebook Pixel connect.facebook.net | Advertising | 50ms | 47 KB | — | $1/mo | Optional |
These scripts may cost more than they're worth
- www.thejakartapost.com adds 1412ms and costs ~$19/month
- securepubads.g.doubleclick.net adds 236ms and costs ~$3/month
100% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.
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 1412ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
securepubads.g.doubleclick.net takes 236ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
58% of securepubads.g.doubleclick.net's code is unused. The script may be loading features you don't use.
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev
52% of fundingchoicesmessages.google.com's code is unused. The script may be loading features you don't use.
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev
75% of pagead2.googlesyndication.com's code is unused. The script may be loading features you don't use.
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev