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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
85
GRADE
B
FIX
1
REVIEW
3
PASS
11
INFO
2

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

Mobile Desktop
70
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.

3.22 s

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

5.00 s

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

166 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.

5.28 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.

7.41 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
11 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
C
Image Optimization
Action
16 images, 0 KB saveable
REVIEW
16 images, 0 KB saveable
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/fast27_... 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/srecon_... 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/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/nsdi27_... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
16 images 252 KB
0 oversized -0 KB
16 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

C
JS Execution Cost
Action
1485ms total JS execution
REVIEW
1485ms total JS execution
Warning::
Unattributable: 464ms CPU time
Warning::
https://www.usenix.org/: 345ms CPU time
Info::
https://www.usenix.org/cdn-cgi/challenge-platform/...: 245ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-WQS...: 159ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-LS8V...: 155ms CPU time
Warning::
Third-party scripts: 1485ms (100% of total)

Main Thread Breakdown

Script Evaluation 43% Other 32% Style & Layout 13% Script Parsing & Compilation 6%
ScriptTotalScriptingParse/CompileParty
Unattributable464ms57ms0ms3rd
https://www.usenix.org/345ms28ms3ms3rd
https://www.usenix.org/cdn-cgi/challenge-platform/scripts/jsd/main.js245ms235ms2ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-WQSPGJT159ms124ms32ms3rd
https://www.googletagmanager.com/gtag/js?id=G-LS8V0YFHZP&cx=c&gtm=4e64h1155ms119ms34ms3rd
https://www.usenix.org/modules/contrib/jquery_update/replace/jquery/1.12/jquery.min.js?tdv981116ms87ms8ms3rd
B
JS Bundles
22 scripts, 131 KB unused
REVIEW
22 scripts, 131 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-LS8V...: 67 KB unused (42%)
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: 131 KB
131 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-LS8V0YFHZP&cx=c&gtm=4e64h1158 KB67 KB (42%)✓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?tdv9811 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
Page Weight Budget
1.0 MB transferred, 80 requests
PASS
1.0 MB transferred, 80 requests
Info::
Page weighs 2.6 MB (1.0 MB transferred)
Info::
80 HTTP requests
Info::
Estimated 0.21 g CO2 per page load
1.0 MB / 2.4 MB budget
1.0 MB transferred
80 requests
0.21 g CO2 per page load
JavaScript 397.9 KiB 39%
Other 261.2 KiB 25%
Images 252.2 KiB 24%
Fonts 66.4 KiB 6%
CSS 41.8 KiB 4%
HTML 7.9 KiB 1%
Other 2.2 KiB 0%
Other 1.2 KiB 0%
Other 549 B 0%
0 2.4 MB 4.9 MB
Under budget
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 (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 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s FCP 3.2 s LCP 5.0 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 — 52 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 — 53 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 — 33 ms — font-display: swap
zYXzKVElMYYaJe8bpLHnCwD... woff2 swap
Size 39 KB
Load time 52 ms
Start 2.3 s
Risk FOUT — text flashes from fallback to web font
B50WF7FGv37QNVWgE0ga--4... woff2 swap
Size 17 KB
Load time 53 ms
Start 2.3 s
Risk FOUT — text flashes from fallback to web font
cIflMapbsEk7TDLdtEz1Bwk... woff2 swap
Size 10 KB
Load time 33 ms
Start 2.3 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
80 resources · 1.0 MB · 131 KB savings available
PASS
80 resources · 1.0 MB · 131 KB savings available
Warning::
Page weight 7 KB over 1MB target
Got: 1.0 MB Expected: ≤ 1 MB
Info::
~131 KB of savings available
Warning::
79 third-party resources (100% of weight)
80 resources · 1.0 MiB · 79 third-party 7.3 KiB over 1MB target
JavaScript 39% · 397.9 KiB
Media 25% · 261.2 KiB
Image 25% · 253.6 KiB
Font 6% · 66.4 KiB
CSS 4% · 41.8 KiB
Document 1% · 8.4 KiB
Other 0% · 2.0 KiB

~131.2 KiB of savings available

Remove unused JavaScript: 131.2 KiB
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
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
80 requests over 3012ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s FCP 3.2 s LCP 5.0 shttps://usenix.org// https://usenix.org/ — 301 — 562 B — 578 ms — h2https://www.usenix.org/www.usenix.org/ https://www.usenix.org/ — 200 — 7.9 KiB — 736 ms — h2https://www.usenix.org/core/misc/normalize.css?tdv981www.usenix.org/core/misc/normalize.... https://www.usenix.org/core/misc/normalize.css?tdv981 — 200 — 2.4 KiB — 571 ms — h2https://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 — 2.6 KiB — 531 ms — h2https://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 — 1.3 KiB — 26 ms — h2https://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 — 764 B — 27 ms — h2https://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 — 672 B — 29 ms — h2https://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 — 1.4 KiB — 525 ms — h2https://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 — 598 B — 27 ms — h2https://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 — 511 B — 551 ms — h2https://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 — 1.3 KiB — 565 ms — h2https://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 — 598 B — 515 ms — h2https://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 — 803 B — 582 ms — h2https://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 — 1.4 KiB — 27 ms — h2https://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 — 531 B — 28 ms — h2https://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 — 941 B — 565 ms — h2https://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 — 480 B — 29 ms — h2https://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 — 867 B — 580 ms — h2https://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 — 1.7 KiB — 535 ms — h2https://www.usenix.org/layouts/motherboard/motherboard.css?tdv981www.usenix.org/layouts/motherboard/... https://www.usenix.org/layouts/motherboard/motherboard.css?tdv981 — 200 — 618 B — 565 ms — h2https://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 — 844 B — 555 ms — h2https://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 — 1.1 KiB — 594 ms — h2https://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 — 1.1 KiB — 595 ms — h2https://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 — 540 B — 36 ms — h2https://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 — 2.8 KiB — 552 ms — h2https://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 — 14.5 KiB — 774 ms — h2https://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 — 33.4 KiB — 724 ms — h2https://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 — 38 ms — h2https://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 — 9.3 KiB — 38 ms — h2https://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 — 1.1 KiB — 41 ms — h2
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s FCP 3.2 s LCP 5.0 shttps://usenix.org// https://usenix.org/ — 301 — 562 B — 578 ms — h2https://www.usenix.org/www.usenix.org/ https://www.usenix.org/ — 200 — 7.9 KiB — 736 ms — h2https://www.usenix.org/core/misc/normalize.css?tdv981www.usenix.org/core/misc/normalize.... https://www.usenix.org/core/misc/normalize.css?tdv981 — 200 — 2.4 KiB — 571 ms — h2https://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 — 2.6 KiB — 531 ms — h2https://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 — 1.3 KiB — 26 ms — h2https://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 — 764 B — 27 ms — h2https://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 — 672 B — 29 ms — h2https://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 — 1.4 KiB — 525 ms — h2https://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 — 598 B — 27 ms — h2https://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 — 511 B — 551 ms — h2https://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 — 1.3 KiB — 565 ms — h2https://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 — 598 B — 515 ms — h2https://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 — 803 B — 582 ms — h2https://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 — 1.4 KiB — 27 ms — h2https://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 — 531 B — 28 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 1485ms · 331KB · $20/mo
Unattributable
Other
Costly
Execution 464ms
Transfer 0 KB
Monthly Cost $6/mo
www.usenix.org
Other
Costly
Execution 345ms
Transfer 8 KB
Monthly Cost $5/mo
www.usenix.org
Other
Costly
Execution 245ms
Transfer 0 KB
Monthly Cost $3/mo
Google Tag Manager
Tag Manager
Optional
Execution 159ms
Transfer 132 KB
Unused 49%
Monthly Cost $2/mo
Google Tag Manager
Tag Manager
Optional
Execution 155ms
Transfer 158 KB
Unused 42%
Monthly Cost $2/mo
www.usenix.org
Other
Optional
Execution 116ms
Transfer 33 KB
Monthly Cost $2/mo

These scripts may cost more than they're worth

  • Unattributable adds 464ms and costs ~$6/month
  • www.usenix.org adds 345ms and costs ~$5/month
  • www.usenix.org adds 245ms and costs ~$3/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.

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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

Unattributable takes 464ms 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

www.usenix.org takes 345ms 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

www.usenix.org takes 245ms 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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