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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
68
GRADE
D
FIX
6
REVIEW
1
PASS
8
INFO
2

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

Mobile Desktop
9
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
87
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.
83
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.

11.20 s

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

58.45 s

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

1.54 s

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

0.452

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

13.44 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.

60.75 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 1 REVIEW 6 FIX
F
Page Weight Budget
Action
15.3 MB transferred, 158 requests
FIX
15.3 MB transferred, 158 requests
Critical::
Page weighs 25.2 MB (15.3 MB transferred)
Warning::
Images are 12.5 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 12.5 MB
Warning::
JavaScript is 2.2 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 2.2 MB
Info::
Fonts are 224 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 224 KB
Info::
CSS is 216 KB — consider purging unused styles
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
Got: 216 KB
Warning::
158 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 3.2 g CO2 per page load
15.3 MB / 2.4 MB budget
15.3 MB transferred
158 requests
3.2 g CO2 per page load
Images 12.5 MiB 82%
JavaScript 2.2 MiB 15%
Fonts 223.5 KiB 1%
CSS 216.2 KiB 1%
HTML 128.7 KiB 1%
Other 7.5 KiB 0%
Other 5.2 KiB 0%
Other 1.3 KiB 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Over budget

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

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

Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.

Why this matters

CSS bundle is large — purge unused styles (PurgeCSS, Tailwind JIT) to reduce CSS payload.

Source: web.dev

Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.

Why this matters

High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.

Source: web.dev

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 (15.3 MiB of 15.3 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
7818ms total JS execution
FIX
7818ms total JS execution
Warning::
https://consent.cookiebot.com/uc.js: 1929ms CPU time
Warning::
Unattributable: 1664ms CPU time
Warning::
https://www.acm.org/: 1338ms CPU time
Warning::
https://consent.cookiebot.com/9bb7fc8b-05a2-4292-8...: 584ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=G-RX44...: 476ms CPU time
Warning::
Third-party scripts: 7818ms (100% of total)

Main Thread Breakdown

Script Evaluation 43% Other 24% Style & Layout 20% Script Parsing & Compilation 5% Parse HTML & CSS 5%
ScriptTotalScriptingParse/CompileParty
https://consent.cookiebot.com/uc.js1929ms1294ms24ms3rd
Unattributable1664ms22ms0ms3rd
https://www.acm.org/1338ms12ms3ms3rd
https://consent.cookiebot.com/9bb7fc8b-05a2-4292-85e6-45213b19c5ff/cc.js?renew=false&referer=www.acm.org&dnt=false&init=false584ms269ms38ms3rd
https://www.googletagmanager.com/gtag/js?id=G-RX448GM2EK&cx=c&gtm=4e64h1476ms399ms68ms3rd
https://s.swiftypecdn.com/install/v2/st.js330ms253ms58ms3rd
https://www.acm.org/cdn-cgi/challenge-platform/scripts/jsd/main.js323ms299ms5ms3rd
https://www.googletagmanager.com/gtag/js?id=AW-968097012&cx=c&gtm=4e64h1259ms179ms39ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-5BVDRXH210ms172ms36ms3rd
https://www.acm.org/js/acm.js?antiCache=1744907005937140ms69ms33ms3rd

Showing top 10 of 15 scripts

F
JS Bundles
Action
34 scripts, 558 KB unused
FIX
34 scripts, 558 KB unused
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-5G4...: 72 KB unused (64%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-M3T...: 72 KB unused (64%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-W4C...: 72 KB unused (64%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://s.swiftypecdn.com/install/v2/st.js: 69 KB unused (62%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-5BV...: 68 KB unused (56%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 558 KB
558 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtm.js?id=GTM-5G4WDJNB111 KB72 KB (64%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-M3TS27JG111 KB72 KB (64%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-W4CLDXL3111 KB72 KB (64%)✓3rd
https://s.swiftypecdn.com/install/v2/st.js112 KB69 KB (62%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-5BVDRXH122 KB68 KB (56%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-RX448GM2EK&cx=c&gtm=4e64h1165 KB66 KB (40%)✓3rd
https://www.googletagmanager.com/gtag/js?id=AW-968097012&cx=c&gtm=4e64h1146 KB65 KB (44%)✓3rd
https://www.acm.org/js/acm.js?antiCache=174490700593777 KB50 KB (65%)✓3rd
https://consent.cookiebot.com/9bb7fc8b-05a2-4292-85e6-45213b19c5ff/cc.js?renew=false&referer=www.acm.org&dnt=false&init=false105 KB25 KB (24%)✓3rd
https://www.googletagmanager.com/gtag/js?id=AW-968097012146 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

F
Page Weight Inventory
Action
158 resources · 15.3 MB · 558 KB savings available
FIX
158 resources · 15.3 MB · 558 KB savings available
Warning::
Page weight 14.3 MB over 1MB target
Got: 15.3 MB Expected: ≤ 1 MB
Info::
~558 KB of savings available
Warning::
157 third-party resources (100% of weight)
Info::
27 resources over 200KB
158 resources · 15.3 MiB · 157 third-party 14.3 MiB over 1MB target
Image 82% · 12.5 MiB
JavaScript 15% · 2.2 MiB
Font 1% · 223.5 KiB
CSS 1% · 216.2 KiB
Document 1% · 128.7 KiB
Other 0% · 9.6 KiB

~558.2 KiB of savings available

Remove unused JavaScript: 558.2 KiB
F
HTTP Caching
Action
No cache headers
FIX
No cache headers
Warning::
No Cache-Control header found
Browsers will use heuristic caching, which can be unpredictable. Set explicit cache headers.

No Cache-Control header

Adding a Cache-Control header can significantly improve repeat-visit performance.

C
Image Optimization
Action
82 images, 0 KB saveable
REVIEW
82 images, 0 KB saveable
Warning::
https://www.acm.org/binaries/content/gallery/globa... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.acm.org/binaries/ctaimagelarge/content... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.acm.org/binaries/ctaimagelarge/content... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.acm.org/binaries/content/gallery/acm/s... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.acm.org/binaries/ctaimagelarge/content... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.acm.org/binaries/ctaimagelarge/content... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.acm.org/binaries/ctaimagelarge/content... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.acm.org/binaries/ctaimagelarge/content... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.acm.org/binaries/ctaimagelarge/content... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.acm.org/binaries/content/gallery/acm/s... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.acm.org/binaries/content/gallery/acm/s... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.acm.org/binaries/ctaimagelarge/content... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.acm.org/binaries/content/gallery/acm/s... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.acm.org/binaries/ctaimagelarge/content... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.acm.org/binaries/ctaimagelarge/content... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.acm.org/binaries/content/gallery/acm/s... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.acm.org/binaries/content/gallery/acm/s... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.acm.org/binaries/content/gallery/acm/s... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.acm.org/binaries/ctaimagelarge/content... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.acm.org/binaries/ctaimagelarge/content... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.acm.org/binaries/ctaimagelarge/content... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.acm.org/binaries/ctaimagelarge/content... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.acm.org/binaries/ctaimagelarge/content... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.acm.org/binaries/content/gallery/acm/s... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.acm.org/binaries/ctaimagelarge/content... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.acm.org/binaries/content/gallery/acm/s... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.acm.org/binaries/ctaimagelarge/content... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.acm.org/binaries/ctaimagelarge/content... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.acm.org/binaries/content/gallery/acm/s... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.acm.org/binaries/ctaimagelarge/content... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.acm.org/binaries/content/gallery/acm/s... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.acm.org/binaries/ctaimagelarge/content... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.acm.org/binaries/ctaimagelarge/content... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.acm.org/binaries/content/gallery/acm/s... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
82 images 12.5 MB
0 oversized -0 KB
81 legacy format
34 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

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

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

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

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
12 fonts (224 KB)
PASS
12 fonts (224 KB)
Info::
12 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

12

224 KB total

Render-blocking

0

of 12

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s 18.0 s 20.0 s 22.0 s 24.0 s 26.0 s 28.0 s 30.0 s 32.0 s 34.0 s 36.0 s 38.0 s 40.0 s 42.0 s 44.0 s 46.0 s 48.0 s 50.0 s 52.0 s 54.0 s 56.0 s 58.0 s 60.0 s FCP 11.2 s LCP 58.4 shttps://www.acm.org/fonts/fontawesome-webfont.woff2?v=4.3.0fontawesome-webfont.woff2 https://www.acm.org/fonts/fontawesome-webfont.woff2?v=4.3.0 — 55.7 KiB — 50 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 33.9 KiB — 56 ms — font-display: swaphttps://fonts.gstatic.com/s/robotocondensed/v31/ieVl2ZhZI2eCN5jzbjEETS9weq8-19K7DQk6YvM.woff2ieVl2ZhZI2eCN5jzbjEETS9... https://fonts.gstatic.com/s/robotocondensed/v31/ieVl2ZhZI2eCN5jzbjEETS9weq8-19K7DQk6YvM.woff2 — 45.0 KiB — 38 ms — font-display: swaphttps://fonts.gstatic.com/s/robotocondensed/v31/ieVl2ZhZI2eCN5jzbjEETS9weq8-19K7DQk6YvM.woff2ieVl2ZhZI2eCN5jzbjEETS9... https://fonts.gstatic.com/s/robotocondensed/v31/ieVl2ZhZI2eCN5jzbjEETS9weq8-19K7DQk6YvM.woff2 — 0 B — 53 ms — font-display: swaphttps://fonts.gstatic.com/s/robotocondensed/v31/ieVl2ZhZI2eCN5jzbjEETS9weq8-19K7DQk6YvM.woff2ieVl2ZhZI2eCN5jzbjEETS9... https://fonts.gstatic.com/s/robotocondensed/v31/ieVl2ZhZI2eCN5jzbjEETS9weq8-19K7DQk6YvM.woff2 — 0 B — 65 ms — font-display: swaphttps://fonts.gstatic.com/s/robotocondensed/v31/ieVj2ZhZI2eCN5jzbjEETS9weq8-19eLDwM9QPFUew.woff2ieVj2ZhZI2eCN5jzbjEETS9... https://fonts.gstatic.com/s/robotocondensed/v31/ieVj2ZhZI2eCN5jzbjEETS9weq8-19eLDwM9QPFUew.woff2 — 50.3 KiB — 42 ms — font-display: swaphttps://fonts.gstatic.com/s/robotocondensed/v31/ieVj2ZhZI2eCN5jzbjEETS9weq8-19eLDwM9QPFUew.woff2ieVj2ZhZI2eCN5jzbjEETS9... https://fonts.gstatic.com/s/robotocondensed/v31/ieVj2ZhZI2eCN5jzbjEETS9weq8-19eLDwM9QPFUew.woff2 — 0 B — 53 ms — font-display: swaphttps://fonts.gstatic.com/s/robotocondensed/v31/ieVj2ZhZI2eCN5jzbjEETS9weq8-19eLDwM9QPFUew.woff2ieVj2ZhZI2eCN5jzbjEETS9... https://fonts.gstatic.com/s/robotocondensed/v31/ieVj2ZhZI2eCN5jzbjEETS9weq8-19eLDwM9QPFUew.woff2 — 0 B — 53 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 36.7 KiB — 51 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 0 B — 50 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 0 B — 0 ms — font-display: swaphttps://cdnjs.cloudflare.com/ajax/libs/slick-carousel/1.9.0/fonts/slick.woffslick.woff https://cdnjs.cloudflare.com/ajax/libs/slick-carousel/1.9.0/fonts/slick.woff — 1.9 KiB — 26 ms — font-display: swap
fontawesome-webfont.woff2 unknown swap
Size 56 KB
Load time 50 ms
Start 458 ms
Risk FOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 34 KB
Load time 56 ms
Start 581 ms
Risk FOUT — text flashes from fallback to web font
ieVl2ZhZI2eCN5jzbjEETS9... woff2 swap
Size 45 KB
Load time 38 ms
Start 1.7 s
Risk FOUT — text flashes from fallback to web font
ieVl2ZhZI2eCN5jzbjEETS9... woff2 swap
Size 0 KB
Load time 53 ms
Start 1.7 s
Risk FOUT — text flashes from fallback to web font
ieVl2ZhZI2eCN5jzbjEETS9... woff2 swap
Size 0 KB
Load time 65 ms
Start 1.7 s
Risk FOUT — text flashes from fallback to web font
ieVj2ZhZI2eCN5jzbjEETS9... woff2 swap
Size 50 KB
Load time 42 ms
Start 1.7 s
Risk FOUT — text flashes from fallback to web font
ieVj2ZhZI2eCN5jzbjEETS9... woff2 swap
Size 0 KB
Load time 53 ms
Start 1.7 s
Risk FOUT — text flashes from fallback to web font
ieVj2ZhZI2eCN5jzbjEETS9... woff2 swap
Size 0 KB
Load time 53 ms
Start 1.7 s
Risk FOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 37 KB
Load time 51 ms
Start 1.7 s
Risk FOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 0 KB
Load time 50 ms
Start 1.7 s
Risk FOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 0 KB
Load time 0 ms
Start 2.7 s
Risk FOUT — text flashes from fallback to web font
slick.woff woff swap
Size 2 KB
Load time 26 ms
Start 2.7 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
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)

Fixing the unchecked items could save ~17 KB and ~34 ms

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+
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

Network Waterfall
158 requests over 3805ms
INFO
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h2https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2fonts.gstatic.com/s/roboto/v48/KFO7... https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 200 — 0 B — 0 ms — h3https://cdnjs.cloudflare.com/ajax/libs/slick-carousel/1.9.0/fonts/slick.woffcdnjs.cloudflare.com/ajax/libs/slic... https://cdnjs.cloudflare.com/ajax/libs/slick-carousel/1.9.0/fonts/slick.woff — 200 — 1.9 KiB — 26 ms — h3https://www.youtube.com/s/_/ytembeds/_/js/k=ytembeds.base.en_US.CYE28xQTWxU.2021.O/am=AAAABA/d=1/exm=base,root/ed=1/br=1/rs=AGKMywGc21Bc99sDrhbnjOkQlq7nTfp_WQ/m=r78Drbwww.youtube.com/s/_/ytembeds/_/js/k... https://www.youtube.com/s/_/ytembeds/_/js/k=ytembeds.base.en_US.CYE28xQTWxU.2021.O/am=AAAABA/d=1/exm=base,root/ed=1/br=1/rs=AGKMywGc21Bc99sDrhbnjOkQlq7nTfp_WQ/m=r78Drb — 200 — 0 B — 1 ms — h2https://i.ytimg.com/vi/wO_ecqK2ARo/sddefault.jpgi.ytimg.com/vi/wO_ecqK2ARo/sddefaul... https://i.ytimg.com/vi/wO_ecqK2ARo/sddefault.jpg — 200 — 96.3 KiB — 68 ms — h3https://www.google.com/js/th/qKGyavTtqsN8WEgkipKf66gOrjuRyzmwbl6TXabwSno.jswww.google.com/js/th/qKGyavTtqsN8WE... https://www.google.com/js/th/qKGyavTtqsN8WEgkipKf66gOrjuRyzmwbl6TXabwSno.js — 200 — 0 B — 1 ms — h3https://www.youtube-nocookie.com/generate_204?BeU4Swwww.youtube-nocookie.com/generate_2... https://www.youtube-nocookie.com/generate_204?BeU4Sw — 204 — 10 B — 19 ms — h3https://jnn-pa.googleapis.com/$rpc/google.internal.waa.v1.Waa/GenerateITjnn-pa.googleapis.com/$rpc/google.i... https://jnn-pa.googleapis.com/$rpc/google.internal.waa.v1.Waa/GenerateIT — 200 — 144 B — 27 ms — h3
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 7818ms · 1141KB · $104/mo
consent.cookiebot.com
Other
Costly
Execution 1929ms
Transfer 36 KB
Monthly Cost $26/mo
Unattributable
Other
Costly
Execution 1664ms
Transfer 0 KB
Monthly Cost $22/mo
www.acm.org
Other
Costly
Execution 1338ms
Transfer 21 KB
Monthly Cost $18/mo
consent.cookiebot.com
Other
Costly
Execution 584ms
Transfer 105 KB
Unused 24%
Monthly Cost $8/mo
Google Tag Manager
Tag Manager
Costly
Execution 476ms
Transfer 165 KB
Unused 40%
Monthly Cost $6/mo
s.swiftypecdn.com
Other
Costly
Execution 330ms
Transfer 112 KB
Unused 62%
Monthly Cost $4/mo
www.acm.org
Other
Costly
Execution 323ms
Transfer 0 KB
Monthly Cost $4/mo
Google Tag Manager
Tag Manager
Costly
Execution 259ms
Transfer 146 KB
Unused 44%
Monthly Cost $3/mo
Google Tag Manager
Tag Manager
Costly
Execution 210ms
Transfer 122 KB
Unused 56%
Monthly Cost $3/mo
www.acm.org
Other
Optional
Execution 140ms
Transfer 77 KB
Unused 65%
Monthly Cost $2/mo
Google Tag Manager
Tag Manager
Optional
Execution 137ms
Transfer 111 KB
Unused 64%
Monthly Cost $2/mo
www.acm.org
Other
Optional
Execution 119ms
Transfer 5 KB
Monthly Cost $2/mo
Google Tag Manager
Tag Manager
Optional
Execution 118ms
Transfer 111 KB
Unused 64%
Monthly Cost $2/mo
Google Tag Manager
Tag Manager
Optional
Execution 103ms
Transfer 111 KB
Unused 64%
Monthly Cost $1/mo
LinkedIn Insight
Advertising
Optional
Execution 90ms
Transfer 19 KB
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • consent.cookiebot.com adds 1929ms and costs ~$26/month
  • Unattributable adds 1664ms and costs ~$22/month
  • www.acm.org adds 1338ms and costs ~$18/month
  • consent.cookiebot.com adds 584ms and costs ~$8/month
  • Google Tag Manager adds 476ms and costs ~$6/month
  • s.swiftypecdn.com adds 330ms and costs ~$4/month
  • www.acm.org adds 323ms and costs ~$4/month
  • Google Tag Manager adds 259ms and costs ~$3/month
  • Google Tag Manager adds 210ms 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.

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

consent.cookiebot.com takes 1929ms 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 1664ms 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.acm.org takes 1338ms 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

consent.cookiebot.com takes 584ms 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 476ms 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

s.swiftypecdn.com takes 330ms 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

62% of s.swiftypecdn.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

www.acm.org takes 323ms 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 259ms 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 210ms 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

56% 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

65% of www.acm.org'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

64% 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

64% 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

64% 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

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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