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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
82
GRADE
B
FIX
4
REVIEW
4
PASS
5
INFO
2

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

Mobile Desktop
94
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
89
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
100
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.

812 ms

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

1.50 s

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

3 ms

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

0.001

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

814 ms

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

1.51 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
5 PASS 4 REVIEW 4 FIX
D
Page Weight Budget
Action
2.4 MB transferred, 58 requests
FIX
2.4 MB transferred, 58 requests
Info::
Page weighs 4.0 MB (2.4 MB transferred)
Warning::
Images are 1.6 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.6 MB
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::
58 HTTP requests
Info::
Estimated 0.50 g CO2 per page load
2.4 MB / 2.4 MB budget
2.4 MB transferred
58 requests
0.50 g CO2 per page load
Images 1.6 MiB 67%
JavaScript 634.7 KiB 26%
Fonts 88.5 KiB 4%
CSS 48.6 KiB 2%
HTML 19.2 KiB 1%
Other 3.4 KiB 0%
Other 904 B 0%
Other 595 B 0%
0 2.4 MB 4.9 MB
Approaching limit

Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.

Why this matters

Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.

Source: web.dev

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

D
Third-Party Impact
Action
99% third-party, 0 ms blocking
FIX
99% third-party, 0 ms blocking
Warning::
Third-party code accounts for 99% of page weight (2.3 MiB of 2.4 MiB)
Info::
Third-party blocking time is low (0 ms)
99%
First-party Third-party
D
Page Weight Inventory
Action
58 resources · 2.4 MB · 300 KB savings available
FIX
58 resources · 2.4 MB · 300 KB savings available
Warning::
Page weight 1.4 MB over 1MB target
Got: 2.4 MB Expected: ≤ 1 MB
Info::
~300 KB of savings available
Warning::
57 third-party resources (99% of weight)
Info::
3 resources over 200KB
58 resources · 2.4 MiB · 57 third-party 1.4 MiB over 1MB target
Image 67% · 1.6 MiB
JavaScript 26% · 634.7 KiB
Font 4% · 88.5 KiB
CSS 2% · 48.6 KiB
Document 1% · 19.2 KiB
Other 0% · 1.5 KiB

~299.7 KiB of savings available

Remove unused JavaScript: 299.7 KiB
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
25 images, 0 KB saveable
REVIEW
25 images, 0 KB saveable
Info::
All images are well-optimized
25 images 1.6 MB
0 oversized -0 KB
9 legacy format
0 missing dimensions CLS risk
B
JS Execution Cost
768ms total JS execution
REVIEW
768ms total JS execution
Info::
https://runsignup.com/: 239ms CPU time
Info::
https://cdnjs.runsignup.com/ajax/libs/jquery/3.7.1...: 153ms CPU time
Info::
https://cdnjs.runsignup.com/ajax/libs/tiny-slider/...: 99ms CPU time
Info::
Unattributable: 97ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-QKEV...: 93ms CPU time
Warning::
Third-party scripts: 529ms (69% of total)

Main Thread Breakdown

Style & Layout 33% Script Evaluation 29% Other 22% Script Parsing & Compilation 8% Rendering 7%
ScriptTotalScriptingParse/CompileParty
https://runsignup.com/239ms4ms1ms1st
https://cdnjs.runsignup.com/ajax/libs/jquery/3.7.1/jquery.min.js153ms36ms3ms3rd
https://cdnjs.runsignup.com/ajax/libs/tiny-slider/2.9.4/min/tiny-slider.js99ms23ms1ms3rd
Unattributable97ms2ms0ms3rd
https://www.googletagmanager.com/gtag/js?id=G-QKEVS8BTWC93ms76ms17ms3rd
https://www.googletagmanager.com/gtag/js?id=G-Q17E71D32R87ms66ms18ms3rd
C
JS Bundles
Action
20 scripts, 300 KB unused
REVIEW
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 (39%)
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 (90%)
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 (39%)✓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 (90%)✓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

C
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
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 500 ms 1.0 s 1.5 s FCP 812 ms LCP 1.5 shttps://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 36.7 KiB — 7 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMaxKUBHMdazTgWw.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMaxKUBHMdazTgWw.woff2 — 16.3 KiB — 6 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMawCUBHMdazTgWw.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMawCUBHMdazTgWw.woff2 — 35.5 KiB — 5 ms — font-display: swap
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 37 KB
Load time 7 ms
Start 432 ms
Risk FOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 16 KB
Load time 6 ms
Start 433 ms
Risk FOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 35 KB
Load time 5 ms
Start 505 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
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
Network Waterfall
58 requests over 3115ms
INFO
0 ms 1.0 s 2.0 s 3.0 s FCP 812 ms LCP 1.5 shttps://runsignup.com// https://runsignup.com/ — 200 — 19.2 KiB — 49 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 — 42 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 — 55 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 — 23 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 — 35 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 — 54 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 — 47 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 — 48 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 — 49 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 — 52 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 — 50 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 — 904 B — 11 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 — 78 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 — 79 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 — 9 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 — 10 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 — 15 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 — 16 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 — 17 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 — 18 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 — 11 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 — 22 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 — 19 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 — 977 B — 20 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 — 23 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 — 24 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 — 627 B — 25 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
69% of JavaScript execution is third-party
First-party Third-party 529ms · 369KB · €8/mo
cdnjs.runsignup.com
Other
Optional
Execution 153ms
Transfer 30 KB
Monthly Cost €2/mo
cdnjs.runsignup.com
Other
Optional
Execution 99ms
Transfer 13 KB
Monthly Cost €2/mo
Unattributable
Other
Optional
Execution 97ms
Transfer 0 KB
Monthly Cost €2/mo
Google Tag Manager
Tag Manager
Optional
Execution 93ms
Transfer 169 KB
Unused 39%
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 87ms
Transfer 157 KB
Unused 41%
Monthly Cost €1/mo

69% 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.

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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

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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