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.
B
Image Optimization
31 images, 0 KB saveable
REVIEW
31 images, 0 KB saveable
Warning::
!
https://subscriberevents.economist.com/wp-content/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
31images940 KB
0oversized-0 KB
30legacy format
1missing 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
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
8 fonts (850 KB)
PASS
8 fonts (850 KB)
Info::
i
8 font(s) use font-display: swap (FOUT risk but functional)
Web fonts
8
850 KB total
Render-blocking
0
of 8
Dominant font-display
swap
Most common across fonts
Font loading timeline
TransferFOIT (block)FOUT (swap)
economist-sans-roman.woff2woff2swap
Size109 KB
Load time86 ms
Start647 ms
RiskFOUT — text flashes from fallback to web font
Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
economist-serif-roman.w...woff2swap
Size98 KB
Load time103 ms
Start647 ms
RiskFOUT — text flashes from fallback to web font
economist-sans-italic.w...woff2swap
Size108 KB
Load time104 ms
Start650 ms
RiskFOUT — text flashes from fallback to web font
Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
economist-serif-italic....woff2swap
Size126 KB
Load time116 ms
Start652 ms
RiskFOUT — text flashes from fallback to web font
Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
economist-sans-headline...woff2swap
Size59 KB
Load time117 ms
Start652 ms
RiskFOUT — text flashes from fallback to web font
economist-serif-display...woff2swap
Size137 KB
Load time30 ms
Start1.9 s
RiskFOUT — text flashes from fallback to web font
Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
economist-sans-roman.woff2woff2swap
Size107 KB
Load time80 ms
Start2.2 s
RiskFOUT — text flashes from fallback to web font
Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
economist-sans-osf-roma...woff2swap
Size107 KB
Load time97 ms
Start2.2 s
RiskFOUT — text flashes from fallback to web font
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 ~346 KB and ~692 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
134 requests over 2912ms
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-party7845ms · 1238KB · $104/mo
Script
Category
Execution
Transfer
Unused
Monthly Cost
Verdict
www.economist.com
www.economist.com
Other
1941ms
82 KB
—
$26/mo
Costly
www.economist.com
www.economist.com
Other
935ms
44 KB
—
$12/mo
Costly
Unattributable
Unattributable
Other
789ms
0 KB
—
$10/mo
Costly
consent.economist.com
consent.economist.com
Other
595ms
42 KB
—
$8/mo
Costly
consent.economist.com
consent.economist.com
Other
435ms
91 KB
68%
$6/mo
Costly
consent.economist.com
consent.economist.com
Other
394ms
2 KB
—
$5/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
282ms
166 KB
37%
$4/mo
Costly
www.economist.com
www.economist.com
Other
273ms
4 KB
—
$4/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
264ms
164 KB
40%
$4/mo
Costly
tags.tiqcdn.com
tags.tiqcdn.com
Other
262ms
33 KB
—
$3/mo
Costly
www.economist.com
www.economist.com
Other
253ms
14 KB
—
$3/mo
Costly
www.economist.com
www.economist.com
Other
231ms
0 KB
—
$3/mo
Costly
js-agent.newrelic.com
js-agent.newrelic.com
Other
158ms
30 KB
—
$2/mo
Optional
cmp-cdn.p.aws.economist.com
cmp-cdn.p.aws.economist.com
Other
131ms
5 KB
—
$2/mo
Optional
consent.economist.com
consent.economist.com
Other
125ms
42 KB
51%
$2/mo
Optional
cdn.eu.amplitude.com
cdn.eu.amplitude.com
Other
124ms
47 KB
—
$2/mo
Optional
Google Analytics
www.google-analytics.com
Analytics
107ms
21 KB
—
$1/mo
Optional
www.economist.com
www.economist.com
Other
99ms
90 KB
68%
$1/mo
Optional
www.economist.com
www.economist.com
Other
84ms
39 KB
54%
$1/mo
Optional
www.economist.com
www.economist.com
Other
84ms
156 KB
44%
$1/mo
Optional
cdn.parsely.com
cdn.parsely.com
Other
80ms
19 KB
—
$1/mo
Optional
www.economist.com
www.economist.com
Other
75ms
14 KB
—
$1/mo
Optional
aswpsdkeu.com
aswpsdkeu.com
Other
68ms
63 KB
71%
$1/mo
Optional
wall-ui-cdn.p.aws.economist.com
wall-ui-cdn.p.aws.economist.com
Other
55ms
69 KB
—
$1/mo
Optional
www.economist.com
Other
Costly
Execution1941ms
Transfer82 KB
Monthly Cost$26/mo
www.economist.com
Other
Costly
Execution935ms
Transfer44 KB
Monthly Cost$12/mo
Unattributable
Other
Costly
Execution789ms
Transfer0 KB
Monthly Cost$10/mo
consent.economist.com
Other
Costly
Execution595ms
Transfer42 KB
Monthly Cost$8/mo
consent.economist.com
Other
Costly
Execution435ms
Transfer91 KB
Unused68%
Monthly Cost$6/mo
consent.economist.com
Other
Costly
Execution394ms
Transfer2 KB
Monthly Cost$5/mo
Google Tag Manager
Tag Manager
Costly
Execution282ms
Transfer166 KB
Unused37%
Monthly Cost$4/mo
www.economist.com
Other
Costly
Execution273ms
Transfer4 KB
Monthly Cost$4/mo
Google Tag Manager
Tag Manager
Costly
Execution264ms
Transfer164 KB
Unused40%
Monthly Cost$4/mo
tags.tiqcdn.com
Other
Costly
Execution262ms
Transfer33 KB
Monthly Cost$3/mo
www.economist.com
Other
Costly
Execution253ms
Transfer14 KB
Monthly Cost$3/mo
www.economist.com
Other
Costly
Execution231ms
Transfer0 KB
Monthly Cost$3/mo
js-agent.newrelic.com
Other
Optional
Execution158ms
Transfer30 KB
Monthly Cost$2/mo
cmp-cdn.p.aws.economist.com
Other
Optional
Execution131ms
Transfer5 KB
Monthly Cost$2/mo
consent.economist.com
Other
Optional
Execution125ms
Transfer42 KB
Unused51%
Monthly Cost$2/mo
cdn.eu.amplitude.com
Other
Optional
Execution124ms
Transfer47 KB
Monthly Cost$2/mo
Google Analytics
Analytics
Optional
Execution107ms
Transfer21 KB
Monthly Cost$1/mo
www.economist.com
Other
Optional
Execution99ms
Transfer90 KB
Unused68%
Monthly Cost$1/mo
www.economist.com
Other
Optional
Execution84ms
Transfer39 KB
Unused54%
Monthly Cost$1/mo
www.economist.com
Other
Optional
Execution84ms
Transfer156 KB
Unused44%
Monthly Cost$1/mo
cdn.parsely.com
Other
Optional
Execution80ms
Transfer19 KB
Monthly Cost$1/mo
www.economist.com
Other
Optional
Execution75ms
Transfer14 KB
Monthly Cost$1/mo
aswpsdkeu.com
Other
Optional
Execution68ms
Transfer63 KB
Unused71%
Monthly Cost$1/mo
wall-ui-cdn.p.aws.economist.com
Other
Optional
Execution55ms
Transfer69 KB
Monthly Cost$1/mo
These scripts may cost more than they're worth
www.economist.com adds 1941ms and costs ~$26/month
www.economist.com adds 935ms and costs ~$12/month
Unattributable adds 789ms and costs ~$10/month
consent.economist.com adds 595ms and costs ~$8/month
consent.economist.com adds 435ms and costs ~$6/month
consent.economist.com adds 394ms and costs ~$5/month
Google Tag Manager adds 282ms and costs ~$4/month
www.economist.com adds 273ms and costs ~$4/month
Google Tag Manager adds 264ms and costs ~$4/month
tags.tiqcdn.com adds 262ms and costs ~$3/month
www.economist.com adds 253ms and costs ~$3/month
www.economist.com adds 231ms 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.economist.com takes 1941ms 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.economist.com takes 935ms 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 789ms 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.economist.com takes 595ms 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.economist.com takes 435ms 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
68% of consent.economist.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
consent.economist.com takes 394ms 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 282ms 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.economist.com takes 273ms 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 264ms 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
tags.tiqcdn.com takes 262ms 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.economist.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
www.economist.com takes 231ms 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
51% of consent.economist.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
68% of www.economist.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
54% of www.economist.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
71% of aswpsdkeu.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.