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https://usenix.org

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
85
GRADE
B
FIX
3
REVIEW
2
PASS
8
INFO
2

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

Mobile Desktop
78
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
96
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
81
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.

1.94 s

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

2.29 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.

0.001

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

2.00 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.

2.30 s

Page Load Progression

529 ms
1.1 s
1.6 s
2.1 s
2.6 s
3.2 s
3.7 s
4.2 s
Checks
15
8 PASS 2 REVIEW 3 FIX
F
Page Weight Budget
Action
2.7 MB transferred, 79 requests
FIX
2.7 MB transferred, 79 requests
Warning::
Page weighs 3.8 MB (2.7 MB transferred)
Info::
79 HTTP requests
Info::
Estimated 0.56 g CO2 per page load
2.7 MB / 2.4 MB budget
2.7 MB transferred
79 requests
0.56 g CO2 per page load
Other 1.9 MiB 72%
JavaScript 400.5 KiB 15%
Images 253.5 KiB 9%
Fonts 66.4 KiB 2%
CSS 46.7 KiB 2%
HTML 8.0 KiB 0%
Other 2.2 KiB 0%
Other 1.4 KiB 0%
Other 549 B 0%
0 2.4 MB 4.9 MB
Over budget
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 (2.7 MiB of 2.7 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
Page Weight Inventory
Action
79 resources · 2.7 MB · 130 KB savings available
FIX
79 resources · 2.7 MB · 130 KB savings available
Warning::
Page weight 1.7 MB over 1MB target
Got: 2.7 MB Expected: ≤ 1 MB
Info::
~130 KB of savings available
Warning::
78 third-party resources (100% of weight)
Info::
1 resources over 200KB
79 resources · 2.7 MiB · 78 third-party 1.7 MiB over 1MB target
Media 72% · 1.9 MiB
JavaScript 15% · 400.5 KiB
Image 9% · 254.9 KiB
Font 2% · 66.4 KiB
CSS 2% · 46.7 KiB
Document 0% · 8.6 KiB
Other 0% · 2.2 KiB

~130.0 KiB of savings available

Remove unused JavaScript: 130.0 KiB
C
Image Optimization
Action
18 images, 0 KB saveable
REVIEW
18 images, 0 KB saveable
Warning::
https://www.usenix.org/sites/default/files/fast27_... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.usenix.org/sites/default/files/nsdi26_... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.usenix.org/sites/default/files/pepr26_... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.usenix.org/sites/default/files/vehicle... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.usenix.org/sites/default/files/srecon_... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.usenix.org/themes/motherboard/images/u... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.usenix.org/themes/motherboard/logo.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.usenix.org/sites/default/files/nsdi27_... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
18 images 254 KB
0 oversized -0 KB
18 legacy format
8 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

B
JS Bundles
22 scripts, 130 KB unused
REVIEW
22 scripts, 130 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-LS8V...: 65 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-WQS...: 65 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.usenix.org/modules/contrib/views_slide...: unminified — 2 KB could be saved
Info::
Total unused JavaScript: 130 KB
130 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-LS8V0YFHZP&cx=c&gtm=4e64h1158 KB65 KB (41%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-WQSPGJT132 KB65 KB (49%)✓3rd
https://www.usenix.org/modules/contrib/views_slideshow/contrib/views_slideshow_cycle/js/views_slideshow_cycle.js?tdv9816 KB—✗3rd
https://www.usenix.org/modules/custom/usenix_extra_field/js/usenix_extra_field.js?tdv9811 KB—✓3rd
https://www.usenix.org/modules/contrib/jquery_update/js/jquery_browser.js?v=0.0.11 KB—✓3rd
https://www.usenix.org/modules/contrib/beautytips/js/jquery.bt.min.js?v=0.9.5-rc16 KB—✓3rd
https://www.usenix.org/modules/contrib/beautytips/js/beautytips.js?v=1.x-2.x2 KB—✓3rd
https://www.usenix.org/modules/contrib/back_to_top/js/back_to_top.js?tdv9812 KB—✓3rd
https://www.usenix.org/modules/contrib/views_slideshow/js/views_slideshow.js?tdv9813 KB—✓3rd
https://www.usenix.org/modules/contrib/views_slideshow/contrib/views_slideshow_cycle/js/formoptions.js?tdv9812 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

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+
JS Execution Cost
328ms total JS execution
PASS
328ms total JS execution
Info::
Unattributable: 115ms CPU time
Info::
https://www.usenix.org/: 76ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-WQS...: 71ms CPU time
Info::
https://www.usenix.org/cdn-cgi/challenge-platform/...: 67ms CPU time
Warning::
Third-party scripts: 328ms (100% of total)

Main Thread Breakdown

Script Evaluation 50% Other 27% Style & Layout 13% Script Parsing & Compilation 7%
ScriptTotalScriptingParse/CompileParty
Unattributable115ms17ms0ms3rd
https://www.usenix.org/76ms7ms1ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-WQSPGJT71ms55ms13ms3rd
https://www.usenix.org/cdn-cgi/challenge-platform/scripts/jsd/main.js67ms65ms0ms3rd
A+
Font Loading
3 fonts (66 KB)
PASS
3 fonts (66 KB)
Info::
3 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

3

66 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 2.0 s FCP 1.9 s LCP 2.3 shttps://fonts.gstatic.com/s/ibmplexsans/v23/zYXzKVElMYYaJe8bpLHnCwDKr932-G7dytD-Dmu1syxeKYbSB4Zh.woff2zYXzKVElMYYaJe8bpLHnCwD... https://fonts.gstatic.com/s/ibmplexsans/v23/zYXzKVElMYYaJe8bpLHnCwDKr932-G7dytD-Dmu1syxeKYbSB4Zh.woff2 — 39.3 KiB — 53 ms — font-display: swaphttps://fonts.gstatic.com/s/funneldisplay/v3/B50WF7FGv37QNVWgE0ga--4Pbb6dDYs0gnHA.woff2B50WF7FGv37QNVWgE0ga--4... https://fonts.gstatic.com/s/funneldisplay/v3/B50WF7FGv37QNVWgE0ga--4Pbb6dDYs0gnHA.woff2 — 17.3 KiB — 38 ms — font-display: swaphttps://fonts.gstatic.com/s/chakrapetch/v13/cIflMapbsEk7TDLdtEz1BwkebIl1R5_F_gUk0w.woff2cIflMapbsEk7TDLdtEz1Bwk... https://fonts.gstatic.com/s/chakrapetch/v13/cIflMapbsEk7TDLdtEz1BwkebIl1R5_F_gUk0w.woff2 — 9.7 KiB — 31 ms — font-display: swap
zYXzKVElMYYaJe8bpLHnCwD... woff2 swap
Size 39 KB
Load time 53 ms
Start 1.5 s
Risk FOUT — text flashes from fallback to web font
B50WF7FGv37QNVWgE0ga--4... woff2 swap
Size 17 KB
Load time 38 ms
Start 1.5 s
Risk FOUT — text flashes from fallback to web font
cIflMapbsEk7TDLdtEz1Bwk... woff2 swap
Size 10 KB
Load time 31 ms
Start 1.5 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=1209600 (2 weeks)
PASS
max-age=1209600 (2 weeks)
Info::
Cache-Control header is set
Got: max-age=1209600
Info::
Effective TTL: 2 weeks (max-age=1209600)
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

max-age=1209600

DirectiveValueMeaning
max-age1209600Cache for 2 weeks
Effective TTL: 1209600 seconds
Network Waterfall
79 requests over 1946ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 1.9 s LCP 2.3 shttps://usenix.org// https://usenix.org/ — 301 — 571 B — 547 ms — h3https://www.usenix.org/www.usenix.org/ https://www.usenix.org/ — 200 — 8.0 KiB — 740 ms — h3https://www.usenix.org/core/misc/normalize.css?tdv981www.usenix.org/core/misc/normalize.... https://www.usenix.org/core/misc/normalize.css?tdv981 — 200 — 2.7 KiB — 26 ms — h3https://www.usenix.org/core/modules/system/css/system.css?tdv981www.usenix.org/core/modules/system/... https://www.usenix.org/core/modules/system/css/system.css?tdv981 — 200 — 2.9 KiB — 38 ms — h3https://www.usenix.org/core/modules/system/css/messages.theme.css?tdv981www.usenix.org/core/modules/system/... https://www.usenix.org/core/modules/system/css/messages.theme.css?tdv981 — 200 — 1.4 KiB — 31 ms — h3https://www.usenix.org/modules/contrib/back_to_top/css/back_to_top.css?tdv981www.usenix.org/modules/contrib/back... https://www.usenix.org/modules/contrib/back_to_top/css/back_to_top.css?tdv981 — 200 — 981 B — 28 ms — h3https://www.usenix.org/core/modules/comment/css/comment.css?tdv981www.usenix.org/core/modules/comment... https://www.usenix.org/core/modules/comment/css/comment.css?tdv981 — 200 — 736 B — 33 ms — h3https://www.usenix.org/core/modules/date/css/date.css?tdv981www.usenix.org/core/modules/date/cs... https://www.usenix.org/core/modules/date/css/date.css?tdv981 — 200 — 1.6 KiB — 48 ms — h3https://www.usenix.org/core/modules/field/css/field.css?tdv981www.usenix.org/core/modules/field/c... https://www.usenix.org/core/modules/field/css/field.css?tdv981 — 200 — 836 B — 29 ms — h3https://www.usenix.org/modules/contrib/og/css/og.css?tdv981www.usenix.org/modules/contrib/og/c... https://www.usenix.org/modules/contrib/og/css/og.css?tdv981 — 200 — 658 B — 25 ms — h3https://www.usenix.org/modules/contrib/paragraphs/css/paragraphs.css?tdv981www.usenix.org/modules/contrib/para... https://www.usenix.org/modules/contrib/paragraphs/css/paragraphs.css?tdv981 — 200 — 1.5 KiB — 47 ms — h3https://www.usenix.org/modules/custom/usenix_conference/css/timezone-picker.css?tdv981www.usenix.org/modules/custom/useni... https://www.usenix.org/modules/custom/usenix_conference/css/timezone-picker.css?tdv981 — 200 — 804 B — 30 ms — h3https://www.usenix.org/modules/custom/usenix_logo_preview/css/usenix_logo_preview.css?tdv981www.usenix.org/modules/custom/useni... https://www.usenix.org/modules/custom/usenix_logo_preview/css/usenix_logo_preview.css?tdv981 — 200 — 1.0 KiB — 35 ms — h3https://www.usenix.org/core/modules/user/css/user.css?tdv981www.usenix.org/core/modules/user/cs... https://www.usenix.org/core/modules/user/css/user.css?tdv981 — 200 — 1.6 KiB — 51 ms — h3https://www.usenix.org/modules/contrib/workflow/workflow_admin_ui/workflow_admin_ui.css?tdv981www.usenix.org/modules/contrib/work... https://www.usenix.org/modules/contrib/workflow/workflow_admin_ui/workflow_admin_ui.css?tdv981 — 200 — 773 B — 37 ms — h3https://www.usenix.org/core/modules/views/css/views.css?tdv981www.usenix.org/core/modules/views/c... https://www.usenix.org/core/modules/views/css/views.css?tdv981 — 200 — 1.2 KiB — 52 ms — h3https://www.usenix.org/modules/contrib/rules/rules.css?tdv981www.usenix.org/modules/contrib/rule... https://www.usenix.org/modules/contrib/rules/rules.css?tdv981 — 200 — 697 B — 36 ms — h3https://www.usenix.org/modules/contrib/geshifilter/geshifilter.css?tdv981www.usenix.org/modules/contrib/gesh... https://www.usenix.org/modules/contrib/geshifilter/geshifilter.css?tdv981 — 200 — 1.1 KiB — 40 ms — h3https://www.usenix.org/modules/custom/biblio/biblio.css?tdv981www.usenix.org/modules/custom/bibli... https://www.usenix.org/modules/custom/biblio/biblio.css?tdv981 — 200 — 1.9 KiB — 55 ms — h3https://www.usenix.org/layouts/motherboard/motherboard.css?tdv981www.usenix.org/layouts/motherboard/... https://www.usenix.org/layouts/motherboard/motherboard.css?tdv981 — 200 — 752 B — 43 ms — h3https://www.usenix.org/core/modules/system/css/menu-dropdown.theme.breakpoint.css?tdv981www.usenix.org/core/modules/system/... https://www.usenix.org/core/modules/system/css/menu-dropdown.theme.breakpoint.css?tdv981 — 200 — 1.0 KiB — 40 ms — h3https://www.usenix.org/core/modules/system/css/menu-dropdown.theme.breakpoint-queries.css?tdv981www.usenix.org/core/modules/system/... https://www.usenix.org/core/modules/system/css/menu-dropdown.theme.breakpoint-queries.css?tdv981 — 200 — 1.4 KiB — 66 ms — h3https://www.usenix.org/core/modules/system/css/menu-toggle.theme.breakpoint.css?tdv981www.usenix.org/core/modules/system/... https://www.usenix.org/core/modules/system/css/menu-toggle.theme.breakpoint.css?tdv981 — 200 — 1.2 KiB — 64 ms — h3https://www.usenix.org/core/modules/system/css/menu-toggle.theme.breakpoint-queries.css?tdv981www.usenix.org/core/modules/system/... https://www.usenix.org/core/modules/system/css/menu-toggle.theme.breakpoint-queries.css?tdv981 — 200 — 777 B — 48 ms — h3https://www.usenix.org/themes/motherboard/core-css-overrides/system.theme.css?tdv981www.usenix.org/themes/motherboard/c... https://www.usenix.org/themes/motherboard/core-css-overrides/system.theme.css?tdv981 — 200 — 3.0 KiB — 76 ms — h3https://www.usenix.org/themes/motherboard/css/style.css?tdv981www.usenix.org/themes/motherboard/c... https://www.usenix.org/themes/motherboard/css/style.css?tdv981 — 200 — 14.7 KiB — 84 ms — h3https://www.usenix.org/modules/contrib/jquery_update/replace/jquery/1.12/jquery.min.js?tdv981www.usenix.org/modules/contrib/jque... https://www.usenix.org/modules/contrib/jquery_update/replace/jquery/1.12/jquery.min.js?tdv981 — 200 — 33.6 KiB — 92 ms — h3https://www.usenix.org/core/misc/jquery.once.js?v=1.2.6www.usenix.org/core/misc/jquery.onc... https://www.usenix.org/core/misc/jquery.once.js?v=1.2.6 — 200 — 1.8 KiB — 81 ms — h3https://www.usenix.org/core/misc/backdrop.js?v=1.30.2www.usenix.org/core/misc/backdrop.j... https://www.usenix.org/core/misc/backdrop.js?v=1.30.2 — 200 — 9.5 KiB — 81 ms — h3https://www.usenix.org/modules/contrib/behavior_weights/js/behavior_weights.js?v=1.x-1.0www.usenix.org/modules/contrib/beha... https://www.usenix.org/modules/contrib/behavior_weights/js/behavior_weights.js?v=1.x-1.0 — 200 — 1.3 KiB — 82 ms — h3
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 1.9 s LCP 2.3 shttps://usenix.org// https://usenix.org/ — 301 — 571 B — 547 ms — h3https://www.usenix.org/www.usenix.org/ https://www.usenix.org/ — 200 — 8.0 KiB — 740 ms — h3https://www.usenix.org/core/misc/normalize.css?tdv981www.usenix.org/core/misc/normalize.... https://www.usenix.org/core/misc/normalize.css?tdv981 — 200 — 2.7 KiB — 26 ms — h3https://www.usenix.org/core/modules/system/css/system.css?tdv981www.usenix.org/core/modules/system/... https://www.usenix.org/core/modules/system/css/system.css?tdv981 — 200 — 2.9 KiB — 38 ms — h3https://www.usenix.org/core/modules/system/css/messages.theme.css?tdv981www.usenix.org/core/modules/system/... https://www.usenix.org/core/modules/system/css/messages.theme.css?tdv981 — 200 — 1.4 KiB — 31 ms — h3https://www.usenix.org/modules/contrib/back_to_top/css/back_to_top.css?tdv981www.usenix.org/modules/contrib/back... https://www.usenix.org/modules/contrib/back_to_top/css/back_to_top.css?tdv981 — 200 — 981 B — 28 ms — h3https://www.usenix.org/core/modules/comment/css/comment.css?tdv981www.usenix.org/core/modules/comment... https://www.usenix.org/core/modules/comment/css/comment.css?tdv981 — 200 — 736 B — 33 ms — h3https://www.usenix.org/core/modules/date/css/date.css?tdv981www.usenix.org/core/modules/date/cs... https://www.usenix.org/core/modules/date/css/date.css?tdv981 — 200 — 1.6 KiB — 48 ms — h3https://www.usenix.org/core/modules/field/css/field.css?tdv981www.usenix.org/core/modules/field/c... https://www.usenix.org/core/modules/field/css/field.css?tdv981 — 200 — 836 B — 29 ms — h3https://www.usenix.org/modules/contrib/og/css/og.css?tdv981www.usenix.org/modules/contrib/og/c... https://www.usenix.org/modules/contrib/og/css/og.css?tdv981 — 200 — 658 B — 25 ms — h3https://www.usenix.org/modules/contrib/paragraphs/css/paragraphs.css?tdv981www.usenix.org/modules/contrib/para... https://www.usenix.org/modules/contrib/paragraphs/css/paragraphs.css?tdv981 — 200 — 1.5 KiB — 47 ms — h3https://www.usenix.org/modules/custom/usenix_conference/css/timezone-picker.css?tdv981www.usenix.org/modules/custom/useni... https://www.usenix.org/modules/custom/usenix_conference/css/timezone-picker.css?tdv981 — 200 — 804 B — 30 ms — h3https://www.usenix.org/modules/custom/usenix_logo_preview/css/usenix_logo_preview.css?tdv981www.usenix.org/modules/custom/useni... https://www.usenix.org/modules/custom/usenix_logo_preview/css/usenix_logo_preview.css?tdv981 — 200 — 1.0 KiB — 35 ms — h3https://www.usenix.org/core/modules/user/css/user.css?tdv981www.usenix.org/core/modules/user/cs... https://www.usenix.org/core/modules/user/css/user.css?tdv981 — 200 — 1.6 KiB — 51 ms — h3https://www.usenix.org/modules/contrib/workflow/workflow_admin_ui/workflow_admin_ui.css?tdv981www.usenix.org/modules/contrib/work... https://www.usenix.org/modules/contrib/workflow/workflow_admin_ui/workflow_admin_ui.css?tdv981 — 200 — 773 B — 37 ms — h3https://www.usenix.org/core/modules/views/css/views.css?tdv981www.usenix.org/core/modules/views/c... https://www.usenix.org/core/modules/views/css/views.css?tdv981 — 200 — 1.2 KiB — 52 ms — h3https://www.usenix.org/modules/contrib/rules/rules.css?tdv981www.usenix.org/modules/contrib/rule... https://www.usenix.org/modules/contrib/rules/rules.css?tdv981 — 200 — 697 B — 36 ms — h3https://www.usenix.org/modules/contrib/geshifilter/geshifilter.css?tdv981www.usenix.org/modules/contrib/gesh... https://www.usenix.org/modules/contrib/geshifilter/geshifilter.css?tdv981 — 200 — 1.1 KiB — 40 ms — h3https://www.usenix.org/modules/custom/biblio/biblio.css?tdv981www.usenix.org/modules/custom/bibli... https://www.usenix.org/modules/custom/biblio/biblio.css?tdv981 — 200 — 1.9 KiB — 55 ms — h3https://www.usenix.org/layouts/motherboard/motherboard.css?tdv981www.usenix.org/layouts/motherboard/... https://www.usenix.org/layouts/motherboard/motherboard.css?tdv981 — 200 — 752 B — 43 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 328ms · 140KB · $4/mo
Unattributable
Other
Optional
Execution 115ms
Transfer 0 KB
Monthly Cost $2/mo
www.usenix.org
Other
Optional
Execution 76ms
Transfer 8 KB
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 71ms
Transfer 132 KB
Unused 49%
Monthly Cost $1/mo
www.usenix.org
Other
Optional
Execution 67ms
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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