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
9 images, 0 KB saveable
REVIEW
9 images, 0 KB saveable
Warning::
!
https://www.paramountplus.com/assets/images/intl-l... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
9images470 KB
0oversized-0 KB
8legacy 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
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
7 fonts (227 KB)
PASS
7 fonts (227 KB)
Info::
i
7 font(s) use font-display: swap (FOUT risk but functional)
Web fonts
7
227 KB total
Render-blocking
0
of 7
Dominant font-display
swap
Most common across fonts
Font loading timeline
TransferFOIT (block)FOUT (swap)
woff2;base64,d09GMgABAA...woff2swap
Size40 KB
Load time47 ms
Start776 ms
RiskFOUT — text flashes from fallback to web font
woff2;base64,d09GMgABAA...woff2swap
Size73 KB
Load time51 ms
Start777 ms
RiskFOUT — text flashes from fallback to web font
woff2;base64,d09GMgABAA...woff2swap
Size40 KB
Load time57 ms
Start778 ms
RiskFOUT — text flashes from fallback to web font
woff2;base64,d09GMgABAA...woff2swap
Size40 KB
Load time61 ms
Start779 ms
RiskFOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a...woff2swap
Size34 KB
Load time34 ms
Start1.8 s
RiskFOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a...woff2swap
Size0 KB
Load time37 ms
Start1.8 s
RiskFOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a...woff2swap
Size0 KB
Load time0 ms
Start3.4 s
RiskFOUT — text flashes from fallback to web font
Optimization checklist
Preload critical fonts (priority=high)
Use woff2 format for all fonts
Set font-display to swap, optional, or fallback
Subset large fonts (≤100 KB each)
A+
Resource Caching
All resources properly cached
PASS
All resources properly cached
Info::
✓
No caching issues found
All static resources have appropriate caching headers.
A+
Critical Rendering Path
No render-blocking resources
PASS
No render-blocking resources
Info::
✓
No render-blocking resources detected
A+
Resource Hints
No optimization needed
PASS
No optimization needed
Info::
✓
No resource hint issues
A+
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
Network Waterfall
72 requests over 3694ms
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-party7869ms · 421KB · €85/mo
Script
Category
Execution
Transfer
Unused
Monthly Cost
Verdict
www.paramountplus.com
www.paramountplus.com
Other
2637ms
22 KB
—
€29/mo
Costly
www.gstatic.com
www.gstatic.com
Other
1170ms
0 KB
45%
€13/mo
Costly
www.paramountplus.com
www.paramountplus.com
Other
1124ms
48 KB
—
€12/mo
Costly
Unattributable
Unattributable
Other
970ms
0 KB
—
€11/mo
Costly
OneTrust
cdn.cookielaw.org
Consent
579ms
128 KB
55%
€6/mo
Essential
www.paramountplus.com
www.paramountplus.com
Other
376ms
3 KB
—
€4/mo
Costly
cdn.privacy.paramount.com
cdn.privacy.paramount.com
Other
296ms
7 KB
—
€3/mo
Costly
www.paramountplus.com
www.paramountplus.com
Other
252ms
137 KB
70%
€3/mo
Costly
www.paramountplus.com
www.paramountplus.com
Other
142ms
3 KB
—
€2/mo
Optional
www.paramountplus.com
www.paramountplus.com
Other
129ms
7 KB
—
€1/mo
Optional
www.paramountplus.com
www.paramountplus.com
Other
129ms
53 KB
57%
€1/mo
Optional
OneTrust
cdn.cookielaw.org
Consent
66ms
13 KB
—
€1/mo
Essential
www.paramountplus.com
Other
Costly
Execution2637ms
Transfer22 KB
Monthly Cost€29/mo
www.gstatic.com
Other
Costly
Execution1170ms
Transfer0 KB
Unused45%
Monthly Cost€13/mo
www.paramountplus.com
Other
Costly
Execution1124ms
Transfer48 KB
Monthly Cost€12/mo
Unattributable
Other
Costly
Execution970ms
Transfer0 KB
Monthly Cost€11/mo
OneTrust
Consent
Essential
Execution579ms
Transfer128 KB
Unused55%
Monthly Cost€6/mo
www.paramountplus.com
Other
Costly
Execution376ms
Transfer3 KB
Monthly Cost€4/mo
cdn.privacy.paramount.com
Other
Costly
Execution296ms
Transfer7 KB
Monthly Cost€3/mo
www.paramountplus.com
Other
Costly
Execution252ms
Transfer137 KB
Unused70%
Monthly Cost€3/mo
www.paramountplus.com
Other
Optional
Execution142ms
Transfer3 KB
Monthly Cost€2/mo
www.paramountplus.com
Other
Optional
Execution129ms
Transfer7 KB
Monthly Cost€1/mo
www.paramountplus.com
Other
Optional
Execution129ms
Transfer53 KB
Unused57%
Monthly Cost€1/mo
OneTrust
Consent
Essential
Execution66ms
Transfer13 KB
Monthly Cost€1/mo
These scripts may cost more than they're worth
www.paramountplus.com adds 2637ms and costs ~€29/month
www.gstatic.com adds 1170ms and costs ~€13/month
www.paramountplus.com adds 1124ms and costs ~€12/month
Unattributable adds 970ms and costs ~€11/month
www.paramountplus.com adds 376ms and costs ~€4/month
cdn.privacy.paramount.com adds 296ms and costs ~€3/month
www.paramountplus.com adds 252ms 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.paramountplus.com takes 2637ms 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.gstatic.com takes 1170ms 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.paramountplus.com takes 1124ms 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 970ms 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
55% 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.
Source: web.dev
www.paramountplus.com takes 376ms 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
cdn.privacy.paramount.com takes 296ms 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.paramountplus.com takes 252ms 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
70% of www.paramountplus.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
57% of www.paramountplus.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.