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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
77
GRADE
C
FIX
2
REVIEW
4
PASS
7
INFO
2

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

Mobile Desktop
84
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
76
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.

1.24 s

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

1.87 s

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

76 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.

2.23 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.

3.19 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
7 PASS 4 REVIEW 2 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 (1.5 MiB of 1.5 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
Page Weight Inventory
Action
73 resources · 1.5 MB · 273 KB savings available
FIX
73 resources · 1.5 MB · 273 KB savings available
Warning::
Page weight 531 KB over 1MB target
Got: 1.5 MB Expected: ≤ 1 MB
Info::
~273 KB of savings available
Warning::
72 third-party resources (100% of weight)
Info::
1 resources over 200KB
73 resources · 1.5 MiB · 72 third-party 530.5 KiB over 1MB target
JavaScript 62% · 967.2 KiB
Image 15% · 231.9 KiB
Font 15% · 227.1 KiB
CSS 4% · 65.3 KiB
Other 2% · 32.6 KiB
Media 1% · 19.8 KiB
Document 1% · 10.6 KiB

~273.0 KiB of savings available

Remove unused JavaScript: 273.0 KiB
B
Page Weight Budget
1.5 MB transferred, 73 requests
REVIEW
1.5 MB transferred, 73 requests
Info::
Page weighs 5.0 MB (1.5 MB transferred)
Warning::
JavaScript is 757 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 757 KB
Info::
Fonts are 227 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 227 KB
Info::
73 HTTP requests
Info::
Estimated 0.32 g CO2 per page load
1.5 MB / 2.4 MB budget
1.5 MB transferred
73 requests
0.32 g CO2 per page load
JavaScript 757.2 KiB 49%
Images 229.4 KiB 15%
Fonts 227.1 KiB 15%
Other 208.5 KiB 13%
CSS 60.0 KiB 4%
Other 39.7 KiB 3%
Other 19.8 KiB 1%
HTML 10.3 KiB 1%
Other 1.8 KiB 0%
Other 672 B 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Approaching limit

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

Subset fonts to include only used characters, or switch to system font stacks.

Why this matters

Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).

Source: web.dev font loading

C
Image Optimization
Action
15 images, 0 KB saveable
REVIEW
15 images, 0 KB saveable
Warning::
https://www.whmcs.com/assets/images/logos/whmcs-co... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.whmcs.com/assets/images/home/domains.p... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.whmcs.com/assets/images/home/security.... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.whmcs.com/assets/images/home-logos-str... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.whmcs.com/assets/images/home/automatio... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.whmcs.com/assets/images/home/billing.p... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.whmcs.com/assets/images/screenshots/wh... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.whmcs.com/assets/images/home/support.p... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.whmcs.com/assets/images/home/customisa... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.whmcs.com/assets/images/footer/cpanel-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
15 images 229 KB
0 oversized -0 KB
15 legacy format
10 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

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

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

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

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

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

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

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

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

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

B
JS Execution Cost
860ms total JS execution
REVIEW
860ms total JS execution
Warning::
https://www.whmcs.com/: 317ms CPU time
Warning::
https://static.zdassets.com/web_widget/classic/lat...: 274ms CPU time
Info::
https://static.zdassets.com/web_widget/classic/lat...: 141ms CPU time
Info::
Unattributable: 128ms CPU time
Warning::
Third-party scripts: 860ms (100% of total)

Main Thread Breakdown

Script Evaluation 65% Other 17% Style & Layout 7% Script Parsing & Compilation 7%
ScriptTotalScriptingParse/CompileParty
https://www.whmcs.com/317ms144ms27ms3rd
https://static.zdassets.com/web_widget/classic/latest/web-widget-chat-sdk-22a6ed7.js274ms257ms5ms3rd
https://static.zdassets.com/web_widget/classic/latest/web-widget-main-22a6ed7.js141ms125ms15ms3rd
Unattributable128ms10ms0ms3rd
C
JS Bundles
Action
31 scripts, 273 KB unused
REVIEW
31 scripts, 273 KB unused
Warning::
https://static.zdassets.com/web_widget/classic/lat...: 106 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-PTC...: 82 KB unused (53%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://web.cmp.usercentrics.eu/ui/v/3.116.0/WebSd...: 35 KB unused (63%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdn.livechatinc.com/tracking.js: 26 KB unused (81%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://static.zdassets.com/web_widget/classic/lat...: 23 KB unused (43%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 273 KB
273 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://static.zdassets.com/web_widget/classic/latest/web-widget-main-22a6ed7.js261 KB106 KB (41%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-PTCS9V157 KB82 KB (53%)✓3rd
https://web.cmp.usercentrics.eu/ui/v/3.116.0/WebSdk.lib.d00a93b7.js56 KB35 KB (63%)✓3rd
https://cdn.livechatinc.com/tracking.js33 KB26 KB (81%)✓3rd
https://static.zdassets.com/web_widget/classic/latest/web-widget-chat-sdk-22a6ed7.js54 KB23 KB (43%)✓3rd
https://web.cmp.usercentrics.eu/tcf/stub.js2 KB—✓3rd
https://static.zdassets.com/web_widget/classic/latest/web-widget-locales/classic/en-us-json-22a6ed7.js6 KB—✓3rd
https://www.whmcs.com/assets/javascript/libs.js22 KB—✓3rd
https://static.zdassets.com/ekr/snippet.js?key=8d31b311-9cc0-461b-8375-72dec88be3fe5 KB—✓3rd
https://dev.visualwebsiteoptimizer.com/cdn/edrv/worker-57f1b8d94a5f9167e9bcdcf861046428.br.js72 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

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

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
4 fonts (227 KB)
PASS
4 fonts (227 KB)
Info::
4 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

4

227 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 FCP 1.2 s LCP 1.9 shttps://www.whmcs.com/assets/fonts/opensans/OpenSans-Regular.woff2OpenSans-Regular.woff2 https://www.whmcs.com/assets/fonts/opensans/OpenSans-Regular.woff2 — 60.8 KiB — 41 ms — font-display: swaphttps://www.whmcs.com/assets/fonts/opensans/OpenSans-Bold.woff2OpenSans-Bold.woff2 https://www.whmcs.com/assets/fonts/opensans/OpenSans-Bold.woff2 — 62.5 KiB — 509 ms — font-display: swaphttps://www.whmcs.com/assets/fonts/raleway/Raleway-Regular.woff2Raleway-Regular.woff2 https://www.whmcs.com/assets/fonts/raleway/Raleway-Regular.woff2 — 51.6 KiB — 33 ms — font-display: swaphttps://www.whmcs.com/assets/fonts/raleway/Raleway-Bold.woff2Raleway-Bold.woff2 https://www.whmcs.com/assets/fonts/raleway/Raleway-Bold.woff2 — 52.2 KiB — 39 ms — font-display: swap
OpenSans-Regular.woff2 woff2 swap
Size 61 KB
Load time 41 ms
Start 1.2 s
Risk FOUT — text flashes from fallback to web font
OpenSans-Bold.woff2 woff2 swap
Size 63 KB
Load time 509 ms
Start 1.2 s
Risk FOUT — text flashes from fallback to web font
Raleway-Regular.woff2 woff2 swap
Size 52 KB
Load time 33 ms
Start 1.2 s
Risk FOUT — text flashes from fallback to web font
Raleway-Bold.woff2 woff2 swap
Size 52 KB
Load time 39 ms
Start 1.2 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+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Cloudflare

A
HTTP Caching
max-age=300 (5 minutes)
PASS
max-age=300 (5 minutes)
Info::
Cache-Control header is set
Got: max-age=300
Info::
Effective TTL: 5 minutes (max-age=300)
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

max-age=300

DirectiveValueMeaning
max-age300Cache for 5 minutes
Effective TTL: 300 seconds
Network Waterfall
73 requests over 2468ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 1.2 s LCP 1.9 shttps://whmcs.com// https://whmcs.com/ — 301 — 327 B — 522 ms — h3https://www.whmcs.com/www.whmcs.com/ https://www.whmcs.com/ — 200 — 9.1 KiB — 515 ms — h3https://www.whmcs.com/assets/stylesheets/main.css?v=43www.whmcs.com/assets/stylesheets/ma... https://www.whmcs.com/assets/stylesheets/main.css?v=43 — 200 — 53.5 KiB — 76 ms — h3https://www.whmcs.com/assets/stylesheets/libs.csswww.whmcs.com/assets/stylesheets/li... https://www.whmcs.com/assets/stylesheets/libs.css — 200 — 6.5 KiB — 63 ms — h3https://www.whmcs.com/assets/images/logos/whmcs-co-brand-logo-inverse.svgwww.whmcs.com/assets/images/logos/w... https://www.whmcs.com/assets/images/logos/whmcs-co-brand-logo-inverse.svg — 200 — 5.4 KiB — 62 ms — h3https://www.whmcs.com/assets/images/logos/whmcs-co-brand-logo.svgwww.whmcs.com/assets/images/logos/w... https://www.whmcs.com/assets/images/logos/whmcs-co-brand-logo.svg — 200 — 5.4 KiB — 63 ms — h3https://www.whmcs.com/assets/images/logos/whmcs-co-brand-logo-inverse-blue.svgwww.whmcs.com/assets/images/logos/w... https://www.whmcs.com/assets/images/logos/whmcs-co-brand-logo-inverse-blue.svg — 200 — 5.4 KiB — 35 ms — h3https://www.whmcs.com/assets/images/screenshots/whmcs-admin-home.pngwww.whmcs.com/assets/images/screens... https://www.whmcs.com/assets/images/screenshots/whmcs-admin-home.png — 200 — 173.8 KiB — 90 ms — h3https://dev.visualwebsiteoptimizer.com/j.php?a=935671&u=https%3A%2F%2Fwww.whmcs.com%2F&vn=2.2&ph=1&st=1125.1000003814697&x=truedev.visualwebsiteoptimizer.com/j.ph... https://dev.visualwebsiteoptimizer.com/j.php?a=935671&u=https%3A%2F%2Fwww.whmcs.com%2F&vn=2.2&ph=1&st=1125.1000003814697&x=true — 200 — 14.5 KiB — 108 ms — h2https://www.whmcs.com/assets/images/home/automation.pngwww.whmcs.com/assets/images/home/au... https://www.whmcs.com/assets/images/home/automation.png — 200 — 5.0 KiB — 29 ms — h3https://www.whmcs.com/assets/vendors/jquery/dist/jquery.min.jswww.whmcs.com/assets/vendors/jquery... https://www.whmcs.com/assets/vendors/jquery/dist/jquery.min.js — 200 — 29.6 KiB — 67 ms — h3https://www.whmcs.com/assets/vendors/bootstrap-sass/assets/javascripts/bootstrap.min.jswww.whmcs.com/assets/vendors/bootst... https://www.whmcs.com/assets/vendors/bootstrap-sass/assets/javascripts/bootstrap.min.js — 200 — 9.8 KiB — 62 ms — h3https://www.whmcs.com/assets/javascript/scripts.js?v=6www.whmcs.com/assets/javascript/scr... https://www.whmcs.com/assets/javascript/scripts.js?v=6 — 200 — 697 B — 57 ms — h3https://www.whmcs.com/assets/javascript/libs.jswww.whmcs.com/assets/javascript/lib... https://www.whmcs.com/assets/javascript/libs.js — 200 — 22.2 KiB — 62 ms — h3https://www.whmcs.com/assets/images/home/billing.pngwww.whmcs.com/assets/images/home/bi... https://www.whmcs.com/assets/images/home/billing.png — 200 — 3.8 KiB — 59 ms — h3https://www.whmcs.com/assets/images/home/domains.pngwww.whmcs.com/assets/images/home/do... https://www.whmcs.com/assets/images/home/domains.png — 200 — 5.4 KiB — 59 ms — h3https://www.whmcs.com/assets/images/home/support.pngwww.whmcs.com/assets/images/home/su... https://www.whmcs.com/assets/images/home/support.png — 200 — 4.2 KiB — 59 ms — h3https://www.whmcs.com/assets/images/home/customisation.pngwww.whmcs.com/assets/images/home/cu... https://www.whmcs.com/assets/images/home/customisation.png — 200 — 3.5 KiB — 59 ms — h3https://www.whmcs.com/assets/images/home/security.pngwww.whmcs.com/assets/images/home/se... https://www.whmcs.com/assets/images/home/security.png — 200 — 3.7 KiB — 59 ms — h3https://www.whmcs.com/assets/images/home-logos-strip.pngwww.whmcs.com/assets/images/home-lo... https://www.whmcs.com/assets/images/home-logos-strip.png — 200 — 7.7 KiB — 76 ms — h3https://www.whmcs.com/assets/images/footer/cpanel-partner-badge.pngwww.whmcs.com/assets/images/footer/... https://www.whmcs.com/assets/images/footer/cpanel-partner-badge.png — 200 — 4.7 KiB — 80 ms — h3https://static.cloudflareinsights.com/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da1771523124516static.cloudflareinsights.com/beaco... https://static.cloudflareinsights.com/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da1771523124516 — 200 — 10.7 KiB — 94 ms — h2https://www.googletagmanager.com/gtm.js?id=GTM-PTCS9Vwww.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-PTCS9V — 200 — 156.6 KiB — 166 ms — h2https://www.whmcs.com/assets/fonts/opensans/OpenSans-Regular.woff2www.whmcs.com/assets/fonts/opensans... https://www.whmcs.com/assets/fonts/opensans/OpenSans-Regular.woff2 — 200 — 60.8 KiB — 41 ms — h3https://www.whmcs.com/assets/fonts/opensans/OpenSans-Bold.woff2www.whmcs.com/assets/fonts/opensans... https://www.whmcs.com/assets/fonts/opensans/OpenSans-Bold.woff2 — 200 — 62.5 KiB — 509 ms — h3https://www.whmcs.com/assets/fonts/raleway/Raleway-Regular.woff2www.whmcs.com/assets/fonts/raleway/... https://www.whmcs.com/assets/fonts/raleway/Raleway-Regular.woff2 — 200 — 51.6 KiB — 33 ms — h3https://www.whmcs.com/assets/fonts/raleway/Raleway-Bold.woff2www.whmcs.com/assets/fonts/raleway/... https://www.whmcs.com/assets/fonts/raleway/Raleway-Bold.woff2 — 200 — 52.2 KiB — 39 ms — h3https://www.whmcs.com/site.webmanifestwww.whmcs.com/site.webmanifest https://www.whmcs.com/site.webmanifest — 200 — 672 B — 532 ms — h3https://cdn.livechatinc.com/tracking.jscdn.livechatinc.com/tracking.js https://cdn.livechatinc.com/tracking.js — 200 — 32.9 KiB — 51 ms — h2https://static.zdassets.com/ekr/snippet.js?key=8d31b311-9cc0-461b-8375-72dec88be3festatic.zdassets.com/ekr/snippet.js?... https://static.zdassets.com/ekr/snippet.js?key=8d31b311-9cc0-461b-8375-72dec88be3fe — 200 — 4.6 KiB — 29 ms — h2
0 ms 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 1.2 s LCP 1.9 shttps://whmcs.com// https://whmcs.com/ — 301 — 327 B — 522 ms — h3https://www.whmcs.com/www.whmcs.com/ https://www.whmcs.com/ — 200 — 9.1 KiB — 515 ms — h3https://www.whmcs.com/assets/stylesheets/main.css?v=43www.whmcs.com/assets/stylesheets/ma... https://www.whmcs.com/assets/stylesheets/main.css?v=43 — 200 — 53.5 KiB — 76 ms — h3https://www.whmcs.com/assets/stylesheets/libs.csswww.whmcs.com/assets/stylesheets/li... https://www.whmcs.com/assets/stylesheets/libs.css — 200 — 6.5 KiB — 63 ms — h3https://www.whmcs.com/assets/images/logos/whmcs-co-brand-logo-inverse.svgwww.whmcs.com/assets/images/logos/w... https://www.whmcs.com/assets/images/logos/whmcs-co-brand-logo-inverse.svg — 200 — 5.4 KiB — 62 ms — h3https://www.whmcs.com/assets/images/logos/whmcs-co-brand-logo.svgwww.whmcs.com/assets/images/logos/w... https://www.whmcs.com/assets/images/logos/whmcs-co-brand-logo.svg — 200 — 5.4 KiB — 63 ms — h3https://www.whmcs.com/assets/images/logos/whmcs-co-brand-logo-inverse-blue.svgwww.whmcs.com/assets/images/logos/w... https://www.whmcs.com/assets/images/logos/whmcs-co-brand-logo-inverse-blue.svg — 200 — 5.4 KiB — 35 ms — h3https://www.whmcs.com/assets/images/screenshots/whmcs-admin-home.pngwww.whmcs.com/assets/images/screens... https://www.whmcs.com/assets/images/screenshots/whmcs-admin-home.png — 200 — 173.8 KiB — 90 ms — h3https://dev.visualwebsiteoptimizer.com/j.php?a=935671&u=https%3A%2F%2Fwww.whmcs.com%2F&vn=2.2&ph=1&st=1125.1000003814697&x=truedev.visualwebsiteoptimizer.com/j.ph... https://dev.visualwebsiteoptimizer.com/j.php?a=935671&u=https%3A%2F%2Fwww.whmcs.com%2F&vn=2.2&ph=1&st=1125.1000003814697&x=true — 200 — 14.5 KiB — 108 ms — h2https://www.whmcs.com/assets/images/home/automation.pngwww.whmcs.com/assets/images/home/au... https://www.whmcs.com/assets/images/home/automation.png — 200 — 5.0 KiB — 29 ms — h3https://www.whmcs.com/assets/vendors/jquery/dist/jquery.min.jswww.whmcs.com/assets/vendors/jquery... https://www.whmcs.com/assets/vendors/jquery/dist/jquery.min.js — 200 — 29.6 KiB — 67 ms — h3https://www.whmcs.com/assets/vendors/bootstrap-sass/assets/javascripts/bootstrap.min.jswww.whmcs.com/assets/vendors/bootst... https://www.whmcs.com/assets/vendors/bootstrap-sass/assets/javascripts/bootstrap.min.js — 200 — 9.8 KiB — 62 ms — h3https://www.whmcs.com/assets/javascript/scripts.js?v=6www.whmcs.com/assets/javascript/scr... https://www.whmcs.com/assets/javascript/scripts.js?v=6 — 200 — 697 B — 57 ms — h3https://www.whmcs.com/assets/javascript/libs.jswww.whmcs.com/assets/javascript/lib... https://www.whmcs.com/assets/javascript/libs.js — 200 — 22.2 KiB — 62 ms — h3https://www.whmcs.com/assets/images/home/billing.pngwww.whmcs.com/assets/images/home/bi... https://www.whmcs.com/assets/images/home/billing.png — 200 — 3.8 KiB — 59 ms — 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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
100% of JavaScript execution is third-party
First-party Third-party 860ms · 324KB · €14/mo
www.whmcs.com
Other
Costly
Execution 317ms
Transfer 9 KB
Monthly Cost €5/mo
Zendesk Widget
Customer Support
Costly
Execution 274ms
Transfer 54 KB
Unused 43%
Monthly Cost €4/mo
Zendesk Widget
Customer Support
Optional
Execution 141ms
Transfer 261 KB
Unused 41%
Monthly Cost €2/mo
Unattributable
Other
Optional
Execution 128ms
Transfer 0 KB
Monthly Cost €2/mo

These scripts may cost more than they're worth

  • www.whmcs.com adds 317ms and costs ~€5/month
  • Zendesk Widget adds 274ms and costs ~€4/month

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

www.whmcs.com takes 317ms 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

Zendesk Widget takes 274ms 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

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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