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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
82
GRADE
B
FIX
4
REVIEW
3
PASS
8
INFO
2

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

Mobile Desktop
64
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
88
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
96
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
92
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.

2.75 s

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

5.06 s

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

501 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.

2.75 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.

8.01 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
17
8 PASS 3 REVIEW 4 FIX
D
Third-Party Impact
Action
98% third-party, 0 ms blocking
FIX
98% third-party, 0 ms blocking
Warning::
Third-party code accounts for 98% of page weight (1.0 MiB of 1.0 MiB)
Info::
Third-party blocking time is low (0 ms)
98%
First-party Third-party
D
JS Execution Cost
Action
3002ms total JS execution
FIX
3002ms total JS execution
Warning::
https://runsignup.com/: 987ms CPU time
Warning::
https://cdnjs.runsignup.com/ajax/libs/jquery/3.7.1...: 459ms CPU time
Warning::
https://cdnjs.runsignup.com/ajax/libs/tiny-slider/...: 383ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=G-QKEV...: 360ms CPU time
Warning::
Unattributable: 336ms CPU time
Warning::
Third-party scripts: 2015ms (67% of total)

Main Thread Breakdown

Style & Layout 35% Script Evaluation 29% Other 19% Script Parsing & Compilation 8% Rendering 7%
ScriptTotalScriptingParse/CompileParty
https://runsignup.com/987ms14ms2ms1st
https://cdnjs.runsignup.com/ajax/libs/jquery/3.7.1/jquery.min.js459ms138ms11ms3rd
https://cdnjs.runsignup.com/ajax/libs/tiny-slider/2.9.4/min/tiny-slider.js383ms93ms5ms3rd
https://www.googletagmanager.com/gtag/js?id=G-QKEVS8BTWC360ms293ms65ms3rd
Unattributable336ms8ms0ms3rd
https://www.googletagmanager.com/gtag/js?id=G-Q17E71D32R312ms252ms57ms3rd
https://www.googletagmanager.com/gtag/js?id=G-QKEVS8BTWC&cx=c&gtm=4e64k098ms32ms65ms3rd
https://cdnjs.runsignup.com/ajax/libs/jqueryui/1.14.1/jquery-ui.min.js67ms36ms30ms3rd
D
JS Bundles
Action
20 scripts, 300 KB unused
FIX
20 scripts, 300 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-QKEV...: 109 KB unused (65%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-QKEV...: 67 KB unused (40%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-Q17E...: 65 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdnjs.runsignup.com/ajax/libs/jqueryui/1.1...: 59 KB unused (89%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 300 KB
300 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-QKEVS8BTWC&cx=c&gtm=4e64k0169 KB109 KB (65%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-QKEVS8BTWC169 KB67 KB (40%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-Q17E71D32R157 KB65 KB (41%)✓3rd
https://cdnjs.runsignup.com/ajax/libs/jqueryui/1.14.1/jquery-ui.min.js66 KB59 KB (89%)✓3rd
https://d368g9lw5ileu7.cloudfront.net/js/ui/expando.min.bObPAI.js1 KB—✓3rd
https://d368g9lw5ileu7.cloudfront.net/js/frontend.min.bOuWg-.js2 KB—✓3rd
https://d368g9lw5ileu7.cloudfront.net/js/utils.min.bP4uUd.js10 KB—✓3rd
https://d368g9lw5ileu7.cloudfront.net/js/session.min.bN4VU_.js1 KB—✓3rd
https://d368g9lw5ileu7.cloudfront.net/js/typescript-compiled/urlTracking/urlTrackingCleaner.bP344r.js1 KB—✓3rd
https://d368g9lw5ileu7.cloudfront.net/js/ui/rsuMenu.min.bNnn_m.js1 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

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

D
HTTP Caching
Action
no-store (uncacheable)
FIX
no-store (uncacheable)
Info::
Cache-Control: no-store prevents all caching
Intentional for dynamic content, but increases server load for every page view.
Got: no-store, no-cache, must-revalidate
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

no-store, no-cache, must-revalidate

DirectiveValueMeaning
no-store—Never cache this response
no-cache—Cache but always revalidate first
must-revalidate—Must recheck with server after expiry
B
Image Optimization
21 images, 0 KB saveable
REVIEW
21 images, 0 KB saveable
Info::
All images are well-optimized
21 images 256 KB
0 oversized -0 KB
8 legacy format
0 missing dimensions CLS risk
B
Page Weight Inventory
53 resources · 1.0 MB · 300 KB savings available
REVIEW
53 resources · 1.0 MB · 300 KB savings available
Warning::
Page weight 27 KB over 1MB target
Got: 1.0 MB Expected: ≤ 1 MB
Info::
~300 KB of savings available
Warning::
52 third-party resources (98% of weight)
53 resources · 1.0 MiB · 52 third-party 27.4 KiB over 1MB target
JavaScript 60% · 634.7 KiB
Image 25% · 258.9 KiB
Font 8% · 88.5 KiB
CSS 5% · 48.6 KiB
Document 2% · 19.2 KiB
Other 0% · 1.5 KiB

~300.2 KiB of savings available

Remove unused JavaScript: 300.2 KiB
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A
Page Weight Budget
1.0 MB transferred, 53 requests
PASS
1.0 MB transferred, 53 requests
Info::
Page weighs 2.7 MB (1.0 MB transferred)
Warning::
JavaScript is 635 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 635 KB
Info::
53 HTTP requests
Info::
Estimated 0.22 g CO2 per page load
1.0 MB / 2.4 MB budget
1.0 MB transferred
53 requests
0.22 g CO2 per page load
JavaScript 634.7 KiB 60%
Images 255.5 KiB 24%
Fonts 88.5 KiB 8%
CSS 48.6 KiB 5%
HTML 19.2 KiB 2%
Other 3.4 KiB 0%
Other 906 B 0%
Other 595 B 0%
0 2.4 MB 4.9 MB
Under 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

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+
Font Loading
3 fonts (88 KB)
PASS
3 fonts (88 KB)
Info::
3 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

3

88 KB total

Render-blocking

0

of 3

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s FCP 2.8 s LCP 5.1 shttps://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 36.7 KiB — 5 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMaxKUBHMdazTgWw.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMaxKUBHMdazTgWw.woff2 — 16.3 KiB — 7 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMawCUBHMdazTgWw.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMawCUBHMdazTgWw.woff2 — 35.5 KiB — 6 ms — font-display: swap
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 37 KB
Load time 5 ms
Start 425 ms
Risk FOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 16 KB
Load time 7 ms
Start 425 ms
Risk FOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 35 KB
Load time 6 ms
Start 503 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
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
3 hints, 0 missing preconnects
PASS
3 hints, 0 missing preconnects
Info::
Page uses 3 resource hint(s)

Current Resource Hints

preconnect
3
preload
—
dns-prefetch
—
prefetch
—

3 resource hints configured

A+
Render-Blocking Resources
No render-blocking resources detected
PASS
No render-blocking resources detected
Info::
No render-blocking resources detected in <head>
A+
Third-Party Resources
No third-party resources detected
PASS
No third-party resources detected
Network Waterfall
53 requests over 3078ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s FCP 2.8 s LCP 5.1 shttps://runsignup.com// https://runsignup.com/ — 200 — 19.2 KiB — 60 ms — h2https://cdnjs.runsignup.com/ajax/libs/webfont/1.6.28/webfontloader.jscdnjs.runsignup.com/ajax/libs/webfo... https://cdnjs.runsignup.com/ajax/libs/webfont/1.6.28/webfontloader.js — 200 — 5.4 KiB — 45 ms — h2https://d368g9lw5ileu7.cloudfront.net/css/rsuInfoBlog.scss.rsu.min.bP0dop.cssd368g9lw5ileu7.cloudfront.net/css/r... https://d368g9lw5ileu7.cloudfront.net/css/rsuInfoBlog.scss.rsu.min.bP0dop.css — 200 — 42.3 KiB — 34 ms — h2https://iad-dynamic-assets.runsignup.com/us-east-1-src/prod/iconfonts/fc33fc7151664f109ef322fa866a9307/style.cssiad-dynamic-assets.runsignup.com/us... https://iad-dynamic-assets.runsignup.com/us-east-1-src/prod/iconfonts/fc33fc7151664f109ef322fa866a9307/style.css — 200 — 4.1 KiB — 35 ms — h2https://cdnjs.runsignup.com/ajax/libs/jquery/3.7.1/jquery.min.jscdnjs.runsignup.com/ajax/libs/jquer... https://cdnjs.runsignup.com/ajax/libs/jquery/3.7.1/jquery.min.js — 200 — 30.1 KiB — 41 ms — h2https://cdnjs.runsignup.com/ajax/libs/jqueryui/1.14.1/jquery-ui.min.jscdnjs.runsignup.com/ajax/libs/jquer... https://cdnjs.runsignup.com/ajax/libs/jqueryui/1.14.1/jquery-ui.min.js — 200 — 66.1 KiB — 49 ms — h2https://d368g9lw5ileu7.cloudfront.net/js/session.min.bN4VU_.jsd368g9lw5ileu7.cloudfront.net/js/se... https://d368g9lw5ileu7.cloudfront.net/js/session.min.bN4VU_.js — 200 — 924 B — 23 ms — h2https://d368g9lw5ileu7.cloudfront.net/js/utils.min.bP4uUd.jsd368g9lw5ileu7.cloudfront.net/js/ut... https://d368g9lw5ileu7.cloudfront.net/js/utils.min.bP4uUd.js — 200 — 10.2 KiB — 24 ms — h2https://d368g9lw5ileu7.cloudfront.net/js/windows.min.bz27OH.jsd368g9lw5ileu7.cloudfront.net/js/wi... https://d368g9lw5ileu7.cloudfront.net/js/windows.min.bz27OH.js — 200 — 1.1 KiB — 25 ms — h2https://d368g9lw5ileu7.cloudfront.net/img/infoBlog/runsignup/2022/10/logo-rsu.bJ0ec2.svgd368g9lw5ileu7.cloudfront.net/img/i... https://d368g9lw5ileu7.cloudfront.net/img/infoBlog/runsignup/2022/10/logo-rsu.bJ0ec2.svg — 200 — 1.9 KiB — 27 ms — h2https://d368g9lw5ileu7.cloudfront.net/img/logos/logo-rsu.bIAeuH.svgd368g9lw5ileu7.cloudfront.net/img/l... https://d368g9lw5ileu7.cloudfront.net/img/logos/logo-rsu.bIAeuH.svg — 200 — 2.0 KiB — 26 ms — h2https://d368g9lw5ileu7.cloudfront.net/img/infoBlog/_static/images/banner-slide-placeholder.bKgFk_.gifd368g9lw5ileu7.cloudfront.net/img/i... https://d368g9lw5ileu7.cloudfront.net/img/infoBlog/_static/images/banner-slide-placeholder.bKgFk_.gif — 200 — 3.9 KiB — 4 ms — h2https://d368g9lw5ileu7.cloudfront.net/manifest/runsignup/site.bJOg53.webmanifestd368g9lw5ileu7.cloudfront.net/manif... https://d368g9lw5ileu7.cloudfront.net/manifest/runsignup/site.bJOg53.webmanifest — 200 — 906 B — 19 ms — h2https://www.googletagmanager.com/gtag/js?id=G-Q17E71D32Rwww.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-Q17E71D32R — 200 — 157.2 KiB — 68 ms — h2https://www.googletagmanager.com/gtag/js?id=G-QKEVS8BTWCwww.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-QKEVS8BTWC — 200 — 169.1 KiB — 54 ms — h2https://d368g9lw5ileu7.cloudfront.net/js/typescript-compiled/urlTracking/urlTrackingCleaner.bP344r.jsd368g9lw5ileu7.cloudfront.net/js/ty... https://d368g9lw5ileu7.cloudfront.net/js/typescript-compiled/urlTracking/urlTrackingCleaner.bP344r.js — 200 — 1.0 KiB — 11 ms — h2https://d368g9lw5ileu7.cloudfront.net/js/ui/rsuMenu.min.bNnn_m.jsd368g9lw5ileu7.cloudfront.net/js/ui... https://d368g9lw5ileu7.cloudfront.net/js/ui/rsuMenu.min.bNnn_m.js — 200 — 1.5 KiB — 12 ms — h2https://d368g9lw5ileu7.cloudfront.net/img/infoBlog/runsignup/aiChatbotSignupLogo.bPctu3.pngd368g9lw5ileu7.cloudfront.net/img/i... https://d368g9lw5ileu7.cloudfront.net/img/infoBlog/runsignup/aiChatbotSignupLogo.bPctu3.png — 200 — 7.6 KiB — 17 ms — h2https://d368g9lw5ileu7.cloudfront.net/img/frontend2018/cookie-img.bFehfM.pngd368g9lw5ileu7.cloudfront.net/img/f... https://d368g9lw5ileu7.cloudfront.net/img/frontend2018/cookie-img.bFehfM.png — 200 — 3.2 KiB — 12 ms — h2https://d368g9lw5ileu7.cloudfront.net/js/ui/expando.min.bObPAI.jsd368g9lw5ileu7.cloudfront.net/js/ui... https://d368g9lw5ileu7.cloudfront.net/js/ui/expando.min.bObPAI.js — 200 — 1.3 KiB — 13 ms — h2https://d368g9lw5ileu7.cloudfront.net/js/frontend.min.bOuWg-.jsd368g9lw5ileu7.cloudfront.net/js/fr... https://d368g9lw5ileu7.cloudfront.net/js/frontend.min.bOuWg-.js — 200 — 1.8 KiB — 14 ms — h2https://cdnjs.runsignup.com/ajax/libs/tiny-slider/2.9.4/min/tiny-slider.jscdnjs.runsignup.com/ajax/libs/tiny-... https://cdnjs.runsignup.com/ajax/libs/tiny-slider/2.9.4/min/tiny-slider.js — 200 — 12.9 KiB — 8 ms — h2https://d368g9lw5ileu7.cloudfront.net/js/infoBlog/template-parts/blocks/banner-slideshow/banner-slideshow.min.bKjZrS.jsd368g9lw5ileu7.cloudfront.net/js/in... https://d368g9lw5ileu7.cloudfront.net/js/infoBlog/template-parts/blocks/banner-slideshow/banner-slideshow.min.bKjZrS.js — 200 — 1.1 KiB — 17 ms — h2https://d368g9lw5ileu7.cloudfront.net/js/infoBlog/template-parts/blocks/customer-spotlight/customer-spotlight.min.bKjZrS.jsd368g9lw5ileu7.cloudfront.net/js/in... https://d368g9lw5ileu7.cloudfront.net/js/infoBlog/template-parts/blocks/customer-spotlight/customer-spotlight.min.bKjZrS.js — 200 — 1.0 KiB — 20 ms — h2https://d368g9lw5ileu7.cloudfront.net/js/infoBlog/template-parts/blocks/featured-buckets/featured-buckets.min.bKjZrS.jsd368g9lw5ileu7.cloudfront.net/js/in... https://d368g9lw5ileu7.cloudfront.net/js/infoBlog/template-parts/blocks/featured-buckets/featured-buckets.min.bKjZrS.js — 200 — 979 B — 17 ms — h2https://d368g9lw5ileu7.cloudfront.net/js/infoBlog/_static/js/main.min.bOg6BY.jsd368g9lw5ileu7.cloudfront.net/js/in... https://d368g9lw5ileu7.cloudfront.net/js/infoBlog/_static/js/main.min.bOg6BY.js — 200 — 2.1 KiB — 21 ms — h2https://d368g9lw5ileu7.cloudfront.net/js/infoBlog/_static/js/navigation.min.bKjZrS.jsd368g9lw5ileu7.cloudfront.net/js/in... https://d368g9lw5ileu7.cloudfront.net/js/infoBlog/_static/js/navigation.min.bKjZrS.js — 200 — 1.1 KiB — 18 ms — h2https://d368g9lw5ileu7.cloudfront.net/js/infoBlog/_static/js/frontendAccountMenu.min.bKBrgY.jsd368g9lw5ileu7.cloudfront.net/js/in... https://d368g9lw5ileu7.cloudfront.net/js/infoBlog/_static/js/frontendAccountMenu.min.bKBrgY.js — 200 — 628 B — 22 ms — h2data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='48' height='12' viewBox='0 0 48…www.w3.org/2000/svg' width='48' hei... data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='48' height='12' viewBox='0 0 48… — 200 — 0 B — 0 ms — datadata:image/svg+xml,%3C%3Fxml version='1.0' encoding='utf-8'%3F%3E%3Csvg version='1.1' id='Layer_1' …data:image/svg+xml,%3C%3Fxml versio... data:image/svg+xml,%3C%3Fxml version='1.0' encoding='utf-8'%3F%3E%3Csvg version='1.1' id='Layer_1' … — 200 — 0 B — 0 ms — data
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HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
67% of JavaScript execution is third-party
First-party Third-party 2015ms · 605KB · €32/mo
cdnjs.runsignup.com
Other
Costly
Execution 459ms
Transfer 30 KB
Monthly Cost €7/mo
cdnjs.runsignup.com
Other
Costly
Execution 383ms
Transfer 13 KB
Monthly Cost €6/mo
Google Tag Manager
Tag Manager
Costly
Execution 360ms
Transfer 169 KB
Unused 40%
Monthly Cost €6/mo
Unattributable
Other
Costly
Execution 336ms
Transfer 0 KB
Monthly Cost €5/mo
Google Tag Manager
Tag Manager
Costly
Execution 312ms
Transfer 157 KB
Unused 41%
Monthly Cost €5/mo
Google Tag Manager
Tag Manager
Optional
Execution 98ms
Transfer 169 KB
Unused 65%
Monthly Cost €2/mo
cdnjs.runsignup.com
Other
Optional
Execution 67ms
Transfer 66 KB
Unused 89%
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • cdnjs.runsignup.com adds 459ms and costs ~€7/month
  • cdnjs.runsignup.com adds 383ms and costs ~€6/month
  • Google Tag Manager adds 360ms and costs ~€6/month
  • Unattributable adds 336ms and costs ~€5/month
  • Google Tag Manager adds 312ms and costs ~€5/month

67% of JavaScript execution time comes from third-party scripts.

Why this matters

Third-party scripts (analytics, ads, social, A/B testing) often dominate execution time — every one is a perf-and-privacy tax.

Learn more ▾

Each third-party script is a black box: you don't control when it loads, what it executes, or how much it grows. They often account for a major share of total blocking time on average sites (HTTP Archive's Web Almanac documents the trend). Audit which ones you actually need, defer the rest, and use facade patterns (lite-youtube, lite-vimeo) for embedded media.

Source: web.dev / HTTP Archive Web Almanac

cdnjs.runsignup.com takes 459ms 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

cdnjs.runsignup.com takes 383ms 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 360ms 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 336ms 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 312ms 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

65% of Google Tag Manager'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

89% of cdnjs.runsignup.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.

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