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
83 images, 0 KB saveable
REVIEW
83 images, 0 KB saveable
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/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/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/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/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/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/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/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/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/l... 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/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.
83images12.7 MB
0oversized-0 KB
82legacy format
61missing dimensionsCLS 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
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 (223 KB)
PASS
12 fonts (223 KB)
Info::
i
12 font(s) use font-display: swap (FOUT risk but functional)
Web fonts
12
223 KB total
Render-blocking
0
of 12
Dominant font-display
swap
Most common across fonts
Font loading timeline
TransferFOIT (block)FOUT (swap)
fontawesome-webfont.woff2unknownswap
Size56 KB
Load time80 ms
Start536 ms
RiskFOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a...woff2swap
Size34 KB
Load time45 ms
Start910 ms
RiskFOUT — text flashes from fallback to web font
ieVl2ZhZI2eCN5jzbjEETS9...woff2swap
Size45 KB
Load time35 ms
Start2.1 s
RiskFOUT — text flashes from fallback to web font
ieVl2ZhZI2eCN5jzbjEETS9...woff2swap
Size0 KB
Load time35 ms
Start2.1 s
RiskFOUT — text flashes from fallback to web font
ieVl2ZhZI2eCN5jzbjEETS9...woff2swap
Size0 KB
Load time10 ms
Start2.2 s
RiskFOUT — text flashes from fallback to web font
ieVj2ZhZI2eCN5jzbjEETS9...woff2swap
Size50 KB
Load time18 ms
Start2.2 s
RiskFOUT — text flashes from fallback to web font
ieVj2ZhZI2eCN5jzbjEETS9...woff2swap
Size0 KB
Load time22 ms
Start2.2 s
RiskFOUT — text flashes from fallback to web font
ieVj2ZhZI2eCN5jzbjEETS9...woff2swap
Size0 KB
Load time27 ms
Start2.2 s
RiskFOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a...woff2swap
Size37 KB
Load time13 ms
Start2.2 s
RiskFOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a...woff2swap
Size0 KB
Load time26 ms
Start2.2 s
RiskFOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a...woff2swap
Size0 KB
Load time0 ms
Start3.0 s
RiskFOUT — text flashes from fallback to web font
slick.woffwoffswap
Size2 KB
Load time12 ms
Start3.1 s
RiskFOUT — 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+
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 4049ms
INFO
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-party2252ms · 706KB · $30/mo
Script
Category
Execution
Transfer
Unused
Monthly Cost
Verdict
www.acm.org
www.acm.org
Other
669ms
21 KB
—
$9/mo
Costly
consent.cookiebot.com
consent.cookiebot.com
Other
566ms
36 KB
—
$8/mo
Costly
Unattributable
Unattributable
Other
338ms
0 KB
—
$4/mo
Costly
consent.cookiebot.com
consent.cookiebot.com
Other
253ms
105 KB
24%
$3/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
122ms
165 KB
40%
$2/mo
Optional
www.acm.org
www.acm.org
Other
99ms
0 KB
—
$1/mo
Optional
s.swiftypecdn.com
s.swiftypecdn.com
Other
81ms
112 KB
62%
$1/mo
Optional
Google Tag Manager
www.googletagmanager.com
Tag Manager
70ms
146 KB
44%
$1/mo
Optional
Google Tag Manager
www.googletagmanager.com
Tag Manager
55ms
122 KB
56%
$1/mo
Optional
www.acm.org
Other
Costly
Execution669ms
Transfer21 KB
Monthly Cost$9/mo
consent.cookiebot.com
Other
Costly
Execution566ms
Transfer36 KB
Monthly Cost$8/mo
Unattributable
Other
Costly
Execution338ms
Transfer0 KB
Monthly Cost$4/mo
consent.cookiebot.com
Other
Costly
Execution253ms
Transfer105 KB
Unused24%
Monthly Cost$3/mo
Google Tag Manager
Tag Manager
Optional
Execution122ms
Transfer165 KB
Unused40%
Monthly Cost$2/mo
www.acm.org
Other
Optional
Execution99ms
Transfer0 KB
Monthly Cost$1/mo
s.swiftypecdn.com
Other
Optional
Execution81ms
Transfer112 KB
Unused62%
Monthly Cost$1/mo
Google Tag Manager
Tag Manager
Optional
Execution70ms
Transfer146 KB
Unused44%
Monthly Cost$1/mo
Google Tag Manager
Tag Manager
Optional
Execution55ms
Transfer122 KB
Unused56%
Monthly Cost$1/mo
These scripts may cost more than they're worth
www.acm.org adds 669ms and costs ~$9/month
consent.cookiebot.com adds 566ms and costs ~$8/month
Unattributable adds 338ms and costs ~$4/month
consent.cookiebot.com adds 253ms 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
www.acm.org takes 669ms 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 566ms 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 338ms 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 253ms 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
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.
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