Performance
· 17 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.
6.47 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
7.87 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
2.01 s
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.
6.62 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.
20.69 s
Page Load Progression
412 ms
824 ms
1.2 s
1.6 s 2.1 s
2.5 s
2.9 s
3.3 sFPage Weight BudgetAction4.5 MB transferred, 173 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
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
FJS Execution CostAction9685ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.irishtimes.com/ | 3542ms | 77ms | 409ms | 3rd |
| https://www.irishtimes.com/pf/dist/engine/react.js?d=210&mxId=00000000 | 2199ms | 1857ms | 29ms | 3rd |
| Unattributable | 1791ms | 522ms | 0ms | 3rd |
| https://www.irishtimes.com/pf/dist/components/combinations/default.js?d=210&mxId=00000000 | 470ms | 246ms | 121ms | 3rd |
| https://cdn.cookielaw.org/scripttemplates/202601.1.0/otBannerSdk.js | 425ms | 281ms | 56ms | 3rd |
| https://irishtimes.video-player.arcpublishing.com/prod/org/irishtimes.js?org=irishtimes | 411ms | 318ms | 22ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-NRHQKJ4 | 407ms | 308ms | 58ms | 3rd |
| https://fce2b75e-f11a-48ad-a60f-7e004eb1d340.edge.permutive.app/fce2b75e-f11a-48ad-a60f-7e004eb1d340-web.js | 242ms | 142ms | 79ms | 3rd |
| https://prod.webpu.sh/tEEXuB8vRMsRMzIydjRZIQjnQzT-EXwR/sdk.js | 137ms | 85ms | 34ms | 3rd |
| https://irishtimes.video-player.arcpublishing.com/prod/powaBoot.js?org=irishtimes | 61ms | 40ms | 19ms | 3rd |
FJS BundlesAction16 scripts, 524 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.irishtimes.com/pf/dist/components/combinations/default.js?d=210&mxId=00000000 | 357 KB | 211 KB (60%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-NRHQKJ4 | 184 KB | 84 KB (46%) | ✓ | 3rd |
| https://cdn.cookielaw.org/scripttemplates/202601.1.0/otBannerSdk.js | 127 KB | 59 KB (47%) | ✓ | 3rd |
| https://irishtimes.video-player.arcpublishing.com/prod/org/irishtimes.js?org=irishtimes | 83 KB | 59 KB (72%) | ✓ | 3rd |
| https://fce2b75e-f11a-48ad-a60f-7e004eb1d340.edge.permutive.app/fce2b75e-f11a-48ad-a60f-7e004eb1d340-web.js | 161 KB | 39 KB (24%) | ✓ | 3rd |
| https://www.irishtimes.com/pf/dist/engine/react.js?d=210&mxId=00000000 | 97 KB | 29 KB (31%) | ✓ | 3rd |
| https://prod.webpu.sh/tEEXuB8vRMsRMzIydjRZIQjnQzT-EXwR/sdk.js | 37 KB | 21 KB (57%) | ✓ | 3rd |
| https://prod.webpu.sh/tEEXuB8vRMsRMzIydjRZIQjnQzT-EXwR/sdk.js | 0 KB | 21 KB (57%) | ✓ | 3rd |
| https://www.queryly.com/js/queryly.v4.min.js | 8 KB | — | ✓ | 3rd |
| https://irishtimes.video-player.arcpublishing.com/prod/powaBoot.js?org=irishtimes | 6 KB | — | ✓ | 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 InventoryAction173 resources · 4.5 MB · 524 KB savings availableFIX
~524.0 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 173 resources | 4.5 MiB | ||||||
CImage OptimizationAction35 images, 0 KB saveableREVIEW
Set explicit width and height to prevent CLS.
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.
Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.
Source: web.dev / Core Web Vitals
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 Loading7 fonts (110 KB)PASS
Web fonts
7
110 KB total
Render-blocking
0
of 7
Dominant font-display
swap
Most common across fonts
Font loading timeline
- Convert to woff2 for ~30% smaller file size
- Convert to woff2 for ~30% smaller file size
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 ~6 KB and ~12 ms
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource Hints4 hints, 0 missing preconnectsPASS
Current Resource Hints
4 resource hints configured
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
AHTTP Cachingmax-age=86400 (1 day)PASS
max-age=86400
| Directive | Value | Meaning |
|---|---|---|
| max-age | 86400 | Cache for 1 day |
Network Waterfall173 requests over 2959msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.irishtimes.com www.irishtimes.com | Other | 3542ms | 787 KB | — | €19/mo | Costly |
www.irishtimes.com www.irishtimes.com | Other | 2199ms | 97 KB | 31% | €12/mo | Costly |
Unattributable Unattributable | Other | 1791ms | 0 KB | — | €9/mo | Costly |
www.irishtimes.com www.irishtimes.com | Other | 470ms | 357 KB | 60% | €2/mo | Costly |
OneTrust cdn.cookielaw.org | Consent | 425ms | 127 KB | 47% | €2/mo | Essential |
irishtimes.video-player.arcpublishing.com irishtimes.video-player.arcpublishing.com | Other | 411ms | 83 KB | 72% | €2/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 407ms | 184 KB | 46% | €2/mo | Costly |
fce2b75e-f11a-48ad-a60f-7e004eb1d340.edge.permutive.app fce2b75e-f11a-48ad-a60f-7e004eb1d340.edge.permutive.app | Other | 242ms | 161 KB | 24% | €1/mo | Costly |
prod.webpu.sh prod.webpu.sh | Other | 137ms | 0 KB | 57% | €1/mo | Optional |
irishtimes.video-player.arcpublishing.com irishtimes.video-player.arcpublishing.com | Other | 61ms | 6 KB | — | €0/mo | Optional |
These scripts may cost more than they're worth
- www.irishtimes.com adds 3542ms and costs ~€19/month
- www.irishtimes.com adds 2199ms and costs ~€12/month
- Unattributable adds 1791ms and costs ~€9/month
- www.irishtimes.com adds 470ms and costs ~€2/month
- irishtimes.video-player.arcpublishing.com adds 411ms and costs ~€2/month
- Google Tag Manager adds 407ms and costs ~€2/month
- fce2b75e-f11a-48ad-a60f-7e004eb1d340.edge.permutive.app adds 242ms and costs ~€1/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.irishtimes.com takes 3542ms 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
www.irishtimes.com takes 2199ms 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
Unattributable takes 1791ms 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
www.irishtimes.com takes 470ms 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
60% of www.irishtimes.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
irishtimes.video-player.arcpublishing.com takes 411ms 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
72% of irishtimes.video-player.arcpublishing.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
Google Tag Manager takes 407ms 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
fce2b75e-f11a-48ad-a60f-7e004eb1d340.edge.permutive.app takes 242ms 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
57% of prod.webpu.sh'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