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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
88
GRADE
B
FIX
1
REVIEW
3
PASS
9
INFO
2

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

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

1.62 s

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

2.39 s

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

0 ms

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

0.006

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

1.62 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.

2.39 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
15
9 PASS 3 REVIEW 1 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 (1.0 MiB of 1.0 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
B
Page Weight Budget
1.0 MB transferred, 28 requests
REVIEW
1.0 MB transferred, 28 requests
Info::
Page weighs 1.8 MB (1.0 MB transferred)
Info::
28 HTTP requests
Info::
Estimated 0.22 g CO2 per page load
1.0 MB / 2.4 MB budget
1.0 MB transferred
28 requests
0.22 g CO2 per page load
Images 557.0 KiB 52%
JavaScript 230.0 KiB 22%
Fonts 173.5 KiB 16%
CSS 87.3 KiB 8%
HTML 13.2 KiB 1%
Other 5.2 KiB 0%
Other 1.9 KiB 0%
0 2.4 MB 4.9 MB
Under budget
B
JS Bundles
7 scripts, 133 KB unused
REVIEW
7 scripts, 133 KB unused
Warning::
https://accounts.google.com/gsi/client: 68 KB unused (71%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.ziprecruiter.ie/assets/application-e9d...: 65 KB unused (66%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 133 KB
133 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://accounts.google.com/gsi/client96 KB68 KB (71%)✓3rd
https://www.ziprecruiter.ie/assets/application-e9ddc4d6149f42da7d8fe5b28105f8dc29f685eec53320c4a43e59e5b1c0540e.js98 KB65 KB (66%)✓3rd
https://www.ziprecruiter.ie/assets/location_autocomplete-d8010398bb3404d5243166df0b1ca1ee304bd69450490b2cfecf14b2bf4ff85a.js1 KB—✓3rd
https://www.ziprecruiter.ie/cdn-cgi/scripts/5c5dd728/cloudflare-static/email-decode.min.js1 KB—✓3rd
https://consent.trustarc.com/notice?gtm=1&domain=ziprecruiter.ie&c=teconsent&js=nj&noticeType=bb10 KB—✓3rd
https://static.cloudflareinsights.com/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da177152312451611 KB—✓3rd
https://www.ziprecruiter.ie/cdn-cgi/challenge-platform/h/b/scripts/jsd/0b8fb825cb67/main.js?14 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

B
HTTP Caching
private,max-age=0,must-revalidate
REVIEW
private,max-age=0,must-revalidate
Info::
Cache-Control header is set
Got: private,max-age=0,must-revalidate
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

private,max-age=0,must-revalidate

DirectiveValueMeaning
private—Only browser cache, not CDN/proxy
max-age0Cache for 0 seconds
must-revalidate—Must recheck with server after expiry
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
Image Optimization
4 images, 0 KB saveable
PASS
4 images, 0 KB saveable
Warning::
https://www.ziprecruiter.ie/uploads/tenant/logo/12... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
4 images 557 KB
0 oversized -0 KB
2 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

A+
JS Execution Cost
250ms total JS execution
PASS
250ms total JS execution
Info::
https://www.ziprecruiter.ie/cdn-cgi/challenge-plat...: 101ms CPU time
Info::
https://www.ziprecruiter.ie/: 84ms CPU time
Info::
Unattributable: 66ms CPU time
Warning::
Third-party scripts: 250ms (100% of total)

Main Thread Breakdown

Script Evaluation 46% Style & Layout 23% Other 18% Script Parsing & Compilation 7% Parse HTML & CSS 5%
ScriptTotalScriptingParse/CompileParty
https://www.ziprecruiter.ie/cdn-cgi/challenge-platform/scripts/jsd/main.js101ms97ms1ms3rd
https://www.ziprecruiter.ie/84ms13ms2ms3rd
Unattributable66ms2ms0ms3rd
A+
Font Loading
4 fonts (173 KB)
PASS
4 fonts (173 KB)
Info::
4 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

4

173 KB total

Render-blocking

0

of 4

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 1.6 s LCP 2.4 shttps://www.ziprecruiter.ie/fonts/aeonik/Aeonik-Regular.woff2Aeonik-Regular.woff2 https://www.ziprecruiter.ie/fonts/aeonik/Aeonik-Regular.woff2 — 41.9 KiB — 34 ms — font-display: swaphttps://www.ziprecruiter.ie/fonts/aeonik/Aeonik-Light.woff2Aeonik-Light.woff2 https://www.ziprecruiter.ie/fonts/aeonik/Aeonik-Light.woff2 — 43.2 KiB — 39 ms — font-display: swaphttps://www.ziprecruiter.ie/fonts/aeonik/Aeonik-Bold.woff2Aeonik-Bold.woff2 https://www.ziprecruiter.ie/fonts/aeonik/Aeonik-Bold.woff2 — 44.5 KiB — 16 ms — font-display: swaphttps://www.ziprecruiter.ie/fonts/aeonik/Aeonik-Medium.woff2Aeonik-Medium.woff2 https://www.ziprecruiter.ie/fonts/aeonik/Aeonik-Medium.woff2 — 43.8 KiB — 19 ms — font-display: swap
Aeonik-Regular.woff2 woff2 swap
Size 42 KB
Load time 34 ms
Start 1.1 s
Risk FOUT — text flashes from fallback to web font
Aeonik-Light.woff2 woff2 swap
Size 43 KB
Load time 39 ms
Start 1.1 s
Risk FOUT — text flashes from fallback to web font
Aeonik-Bold.woff2 woff2 swap
Size 45 KB
Load time 16 ms
Start 1.1 s
Risk FOUT — text flashes from fallback to web font
Aeonik-Medium.woff2 woff2 swap
Size 44 KB
Load time 19 ms
Start 1.1 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
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
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
A
Page Weight Inventory
28 resources · 1.0 MB · 133 KB savings available
PASS
28 resources · 1.0 MB · 133 KB savings available
Warning::
Page weight 44 KB over 1MB target
Got: 1.0 MB Expected: ≤ 1 MB
Info::
~133 KB of savings available
Warning::
27 third-party resources (100% of weight)
Info::
1 resources over 200KB
28 resources · 1.0 MiB · 27 third-party 44.2 KiB over 1MB target
Image 52% · 559.5 KiB
JavaScript 22% · 230.0 KiB
Font 16% · 173.5 KiB
CSS 8% · 87.3 KiB
Document 2% · 16.1 KiB
Other 0% · 1.7 KiB

~132.7 KiB of savings available

Remove unused JavaScript: 132.7 KiB
A+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Cloudflare

Network Waterfall
28 requests over 1459ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 1.6 s LCP 2.4 shttps://ziprecruiter.com// https://ziprecruiter.com/ — 301 — 650 B — 256 ms — h3https://www.ziprecruiter.com/www.ziprecruiter.com/ https://www.ziprecruiter.com/ — 307 — 1.6 KiB — 330 ms — h3https://www.ziprecruiter.ie/www.ziprecruiter.ie/ https://www.ziprecruiter.ie/ — 200 — 13.2 KiB — 325 ms — h3https://www.ziprecruiter.ie/assets/application-e9ddc4d6149f42da7d8fe5b28105f8dc29f685eec53320c4a43e59e5b1c0540e.jswww.ziprecruiter.ie/assets/applicat... https://www.ziprecruiter.ie/assets/application-e9ddc4d6149f42da7d8fe5b28105f8dc29f685eec53320c4a43e59e5b1c0540e.js — 200 — 98.1 KiB — 32 ms — h3https://www.ziprecruiter.ie/assets/application-783d8dbf082be181fc7639c3a200832be68433effeb947bf1811457b94c5bf7d.csswww.ziprecruiter.ie/assets/applicat... https://www.ziprecruiter.ie/assets/application-783d8dbf082be181fc7639c3a200832be68433effeb947bf1811457b94c5bf7d.css — 200 — 20.9 KiB — 20 ms — h3https://www.ziprecruiter.ie/assets/boards/ziprecruiter-theme-9239bdd31f88c45ec2748c63e4c5759c64b75a20bbe8547dca219f7ddbffb9e1.csswww.ziprecruiter.ie/assets/boards/z... https://www.ziprecruiter.ie/assets/boards/ziprecruiter-theme-9239bdd31f88c45ec2748c63e4c5759c64b75a20bbe8547dca219f7ddbffb9e1.css — 200 — 65.8 KiB — 24 ms — h3https://www.ziprecruiter.ie/uploads/tenant/logo/12218/ziprecruiter-whitetext.png?v=20260319www.ziprecruiter.ie/uploads/tenant/... https://www.ziprecruiter.ie/uploads/tenant/logo/12218/ziprecruiter-whitetext.png?v=20260319 — 200 — 2.0 KiB — 28 ms — h3https://www.ziprecruiter.ie/assets/location_autocomplete-d8010398bb3404d5243166df0b1ca1ee304bd69450490b2cfecf14b2bf4ff85a.jswww.ziprecruiter.ie/assets/location... https://www.ziprecruiter.ie/assets/location_autocomplete-d8010398bb3404d5243166df0b1ca1ee304bd69450490b2cfecf14b2bf4ff85a.js — 200 — 1.2 KiB — 27 ms — h3https://www.ziprecruiter.ie/intl_assets/images/uk/mobile_and_desktop_alerts.svgwww.ziprecruiter.ie/intl_assets/ima... https://www.ziprecruiter.ie/intl_assets/images/uk/mobile_and_desktop_alerts.svg — 200 — 18.1 KiB — 13 ms — h3https://www.ziprecruiter.ie/cdn-cgi/scripts/5c5dd728/cloudflare-static/email-decode.min.jswww.ziprecruiter.ie/cdn-cgi/scripts... https://www.ziprecruiter.ie/cdn-cgi/scripts/5c5dd728/cloudflare-static/email-decode.min.js — 200 — 726 B — 5 ms — h3https://consent.trustarc.com/notice?gtm=1&domain=ziprecruiter.ie&c=teconsent&js=nj&noticeType=bbconsent.trustarc.com/notice?gtm=1&d... https://consent.trustarc.com/notice?gtm=1&domain=ziprecruiter.ie&c=teconsent&js=nj&noticeType=bb — 200 — 9.7 KiB — 16 ms — h2https://accounts.google.com/gsi/clientaccounts.google.com/gsi/client https://accounts.google.com/gsi/client — 200 — 96.0 KiB — 38 ms — h2https://static.cloudflareinsights.com/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da1771523124516static.cloudflareinsights.com/beaco... https://static.cloudflareinsights.com/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da1771523124516 — 200 — 10.7 KiB — 56 ms — h2https://www.ziprecruiter.ie/uploads/widget/search_widget/image/50408/ezgif.png?v=20260319www.ziprecruiter.ie/uploads/widget/... https://www.ziprecruiter.ie/uploads/widget/search_widget/image/50408/ezgif.png?v=20260319 — 200 — 536.9 KiB — 74 ms — h3https://www.ziprecruiter.ie/fonts/aeonik/Aeonik-Regular.woff2www.ziprecruiter.ie/fonts/aeonik/Ae... https://www.ziprecruiter.ie/fonts/aeonik/Aeonik-Regular.woff2 — 200 — 41.9 KiB — 34 ms — h3https://www.ziprecruiter.ie/fonts/aeonik/Aeonik-Light.woff2www.ziprecruiter.ie/fonts/aeonik/Ae... https://www.ziprecruiter.ie/fonts/aeonik/Aeonik-Light.woff2 — 200 — 43.2 KiB — 39 ms — h3data:image/svg+xml;charset=utf-8,%3Csvg%20xmlns%3D%22http%3A//www.w3.org/2000/svg%22%20width%3D%221…data:image/svg+xml;charset=utf-8,%3... data:image/svg+xml;charset=utf-8,%3Csvg%20xmlns%3D%22http%3A//www.w3.org/2000/svg%22%20width%3D%221… — 200 — 0 B — 0 ms — datadata:image/svg+xml;charset=utf-8,%3Csvg%20xmlns%3D%22http%3A//www.w3.org/2000/svg%22%20width%3D%221…data:image/svg+xml;charset=utf-8,%3... data:image/svg+xml;charset=utf-8,%3Csvg%20xmlns%3D%22http%3A//www.w3.org/2000/svg%22%20width%3D%221… — 200 — 0 B — 0 ms — datahttps://www.ziprecruiter.ie/fonts/aeonik/Aeonik-Bold.woff2www.ziprecruiter.ie/fonts/aeonik/Ae... https://www.ziprecruiter.ie/fonts/aeonik/Aeonik-Bold.woff2 — 200 — 44.5 KiB — 16 ms — h3https://www.ziprecruiter.ie/fonts/aeonik/Aeonik-Medium.woff2www.ziprecruiter.ie/fonts/aeonik/Ae... https://www.ziprecruiter.ie/fonts/aeonik/Aeonik-Medium.woff2 — 200 — 43.8 KiB — 19 ms — h3https://www.ziprecruiter.ie/site_notificationswww.ziprecruiter.ie/site_notificati... https://www.ziprecruiter.ie/site_notifications — 200 — 652 B — 297 ms — h3https://www.ziprecruiter.ie/cdn-cgi/challenge-platform/scripts/jsd/main.jswww.ziprecruiter.ie/cdn-cgi/challen... https://www.ziprecruiter.ie/cdn-cgi/challenge-platform/scripts/jsd/main.js — 302 — 455 B — 18 ms — h3https://www.ziprecruiter.ie/cdn-cgi/challenge-platform/h/b/scripts/jsd/0b8fb825cb67/main.js?www.ziprecruiter.ie/cdn-cgi/challen... https://www.ziprecruiter.ie/cdn-cgi/challenge-platform/h/b/scripts/jsd/0b8fb825cb67/main.js? — 200 — 13.6 KiB — 12 ms — h3https://accounts.google.com/gsi/styleaccounts.google.com/gsi/style https://accounts.google.com/gsi/style — 200 — 642 B — 17 ms — h2https://www.ziprecruiter.ie/cdn-cgi/challenge-platform/h/b/jsd/oneshot/0b8fb825cb67/0.9554077391725713:1776816681:3RMSvTX9aWW6mfNoQJc2PUHK-15iU2UtITg63dWewiU/9f00adba9e32e10awww.ziprecruiter.ie/cdn-cgi/challen... https://www.ziprecruiter.ie/cdn-cgi/challenge-platform/h/b/jsd/oneshot/0b8fb825cb67/0.9554077391725713:1776816681:3RMSvTX9aWW6mfNoQJc2PUHK-15iU2UtITg63dWewiU/9f00adba9e32e10a — 200 — 1.0 KiB — 10 ms — h3https://accounts.google.com/gsi/log?client_id=1061202444654-8u7b62a3f33a2dh04a4n45fak8tta186.apps.googleusercontent.com&as=mJnR%2BshYOOq30WcPh3C7qG6Uoa0RSHdTrjUtBlrXB2w&bs=bpNnyp1dUvMMT3EWQXlXAFj7dGNxNOpiKw1JdHkuouI&event=onetap.card.prompt.apiCall&enable_itp_optimization=18accounts.google.com/gsi/log?client_... https://accounts.google.com/gsi/log?client_id=1061202444654-8u7b62a3f33a2dh04a4n45fak8tta186.apps.googleusercontent.com&as=mJnR%2BshYOOq30WcPh3C7qG6Uoa0RSHdTrjUtBlrXB2w&bs=bpNnyp1dUvMMT3EWQXlXAFj7dGNxNOpiKw1JdHkuouI&event=onetap.card.prompt.apiCall&enable_itp_optimization=18 — 200 — 23 B — 16 ms — h3https://www.ziprecruiter.ie/cdn-cgi/rum?www.ziprecruiter.ie/cdn-cgi/rum? https://www.ziprecruiter.ie/cdn-cgi/rum? — 204 — 199 B — 6 ms — h3https://www.ziprecruiter.ie/uploads/tenant/favicon/12218/ico_zipchair.png?v=20260319www.ziprecruiter.ie/uploads/tenant/... https://www.ziprecruiter.ie/uploads/tenant/favicon/12218/ico_zipchair.png?v=20260319 — 200 — 2.5 KiB — 15 ms — h3
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 250ms · 14KB · $3/mo
www.ziprecruiter.ie
Other
Optional
Execution 101ms
Transfer 0 KB
Monthly Cost $1/mo
www.ziprecruiter.ie
Other
Optional
Execution 84ms
Transfer 13 KB
Monthly Cost $1/mo
Unattributable
Other
Optional
Execution 66ms
Transfer 0 KB
Monthly Cost $1/mo

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

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.

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