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
63 images, 0 KB saveable
REVIEW
63 images, 0 KB saveable
Warning::
!
https://www.apa.org/images/2026-04-05-conversation... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.apa.org/images/standards-guidelines-50... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.apa.org/images/cover-image-psychology-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.apa.org/Content/Images/logo.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.apa.org/images/misinformation-disinfor... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.apa.org/images/2026-04-05-datapoint-ti... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.apa.org/images/topss-teaching-award_tc... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.apa.org/images/2026-01-02-trends-emoti... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.apa.org/images/2026-03-ceo-tile_tcm7-3... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.apa.org/images/tile-ai-emotional-intel... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.apa.org/images/index-topss-competition... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.apa.org/images/thumb-spta-professional... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.apa.org/images/tile-press-overreliance... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.apa.org/images/ce-training-50_tcm7-329... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.apa.org/images/divisions-index_tcm7-32... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.apa.org/images/2026-03-datapoint-tile_... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.apa.org/images/3843228-475_tcm7-338075... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.apa.org/images/careers-early-caree-squ... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.apa.org/images/apa-services-tile_tcm7-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.apa.org/Content/Images/leaf-icon.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.apa.org/images/sop-lynn_tcm7-348982.jp... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.apa.org/images/health-advisory-chatbot... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.apa.org/images/funding-awards-50_tcm7-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.apa.org/images/amp-475_tcm7-338900_w64... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.apa.org/images/military-veterans-landi... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.apa.org/images/2025-apa-community_tcm7... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.apa.org/images/member-benefits-50_tcm7... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.apa.org/images/antisemitism-religious-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.apa.org/images/2026-03-conversation-co... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
63images1.5 MB
0oversized-0 KB
62legacy format
29missing 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
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW
Green Hosting
No green hosting detected
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
9 fonts (892 KB)
PASS
9 fonts (892 KB)
Info::
i
9 font(s) use font-display: swap (FOUT risk but functional)
Web fonts
9
892 KB total
Render-blocking
0
of 9
Dominant font-display
swap
Most common across fonts
Font loading timeline
TransferFOIT (block)FOUT (swap)
WhitneySSm-Book-Adv_Web...woffswap
Size83 KB
Load time40 ms
Start811 ms
RiskFOUT — text flashes from fallback to web font
Convert to woff2 for ~30% smaller file size
WhitneySSm-Medium-Adv_W...woffswap
Size87 KB
Load time53 ms
Start811 ms
RiskFOUT — text flashes from fallback to web font
Convert to woff2 for ~30% smaller file size
WhitneySSm-Light-Adv_We...woffswap
Size100 KB
Load time84 ms
Start811 ms
RiskFOUT — text flashes from fallback to web font
Convert to woff2 for ~30% smaller file size
WhitneySSm-BookItalic-A...woffswap
Size99 KB
Load time94 ms
Start812 ms
RiskFOUT — text flashes from fallback to web font
Convert to woff2 for ~30% smaller file size
SentinelSSm-Medium-Pro_...woffswap
Size108 KB
Load time83 ms
Start834 ms
RiskFOUT — text flashes from fallback to web font
Convert to woff2 for ~30% smaller file size
Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
SentinelSSm-Semibold-Pr...woffswap
Size109 KB
Load time27 ms
Start891 ms
RiskFOUT — text flashes from fallback to web font
Convert to woff2 for ~30% smaller file size
Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
WhitneySSm-Semibold-Adv...woffswap
Size98 KB
Load time52 ms
Start891 ms
RiskFOUT — text flashes from fallback to web font
Convert to woff2 for ~30% smaller file size
SentinelSSm-Book-Pro_We...woffswap
Size108 KB
Load time40 ms
Start892 ms
RiskFOUT — text flashes from fallback to web font
Convert to woff2 for ~30% smaller file size
Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
WhitneySSm-SemiboldItal...woffswap
Size102 KB
Load time44 ms
Start892 ms
RiskFOUT — text flashes from fallback to web font
Convert to woff2 for ~30% smaller file size
Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
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 ~481 KB and ~962 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
Network Waterfall
127 requests over 5331ms
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-party2035ms · 997KB · $27/mo
Script
Category
Execution
Transfer
Unused
Monthly Cost
Verdict
www.apa.org
www.apa.org
Other
636ms
243 KB
—
$8/mo
Costly
www.apa.org
www.apa.org
Other
389ms
24 KB
—
$5/mo
Costly
www.apa.org
www.apa.org
Other
230ms
46 KB
—
$3/mo
Costly
Unattributable
Unattributable
Other
229ms
0 KB
—
$3/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
211ms
188 KB
30%
$3/mo
Costly
ajax.googleapis.com
ajax.googleapis.com
Other
111ms
30 KB
—
$1/mo
Optional
securepubads.g.doubleclick.net
securepubads.g.doubleclick.net
Other
90ms
188 KB
77%
$1/mo
Optional
OneTrust
cdn.cookielaw.org
Consent
76ms
109 KB
52%
$1/mo
Essential
Google Tag Manager
www.googletagmanager.com
Tag Manager
62ms
169 KB
40%
$1/mo
Optional
www.apa.org
Other
Costly
Execution636ms
Transfer243 KB
Monthly Cost$8/mo
www.apa.org
Other
Costly
Execution389ms
Transfer24 KB
Monthly Cost$5/mo
www.apa.org
Other
Costly
Execution230ms
Transfer46 KB
Monthly Cost$3/mo
Unattributable
Other
Costly
Execution229ms
Transfer0 KB
Monthly Cost$3/mo
Google Tag Manager
Tag Manager
Costly
Execution211ms
Transfer188 KB
Unused30%
Monthly Cost$3/mo
ajax.googleapis.com
Other
Optional
Execution111ms
Transfer30 KB
Monthly Cost$1/mo
securepubads.g.doubleclick.net
Other
Optional
Execution90ms
Transfer188 KB
Unused77%
Monthly Cost$1/mo
OneTrust
Consent
Essential
Execution76ms
Transfer109 KB
Unused52%
Monthly Cost$1/mo
Google Tag Manager
Tag Manager
Optional
Execution62ms
Transfer169 KB
Unused40%
Monthly Cost$1/mo
These scripts may cost more than they're worth
www.apa.org adds 636ms and costs ~$8/month
www.apa.org adds 389ms and costs ~$5/month
www.apa.org adds 230ms and costs ~$3/month
Unattributable adds 229ms and costs ~$3/month
Google Tag Manager adds 211ms 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.apa.org takes 636ms 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.apa.org takes 389ms 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.apa.org takes 230ms 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 229ms 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 211ms 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
77% of securepubads.g.doubleclick.net'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
52% of OneTrust'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.