Intentional for dynamic content, but increases server load for every page view.
Got: no-cache, no-store, must-revalidate
Info::
i
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control
no-cache, no-store, must-revalidate
Directive
Value
Meaning
no-cache
—
Cache but always revalidate first
no-store
—
Never cache this response
must-revalidate
—
Must recheck with server after expiry
B
Image Optimization
30 images, 0 KB saveable
REVIEW
30 images, 0 KB saveable
Warning::
!
https://www.singaporeair.com/content/dam/sia/web-a... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
30images328 KB
0oversized-0 KB
22legacy 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
15 fonts (247 KB)
PASS
15 fonts (247 KB)
Info::
i
15 font(s) use font-display: swap (FOUT risk but functional)
Web fonts
15
247 KB total
Render-blocking
0
of 15
Dominant font-display
swap
Most common across fonts
Font loading timeline
TransferFOIT (block)FOUT (swap)
sigvar_serial-regular-w...woff2swap
Size22 KB
Load time13 ms
Start226 ms
RiskFOUT — text flashes from fallback to web font
sigvar_serial-regular-w...woff2swap
Size0 KB
Load time2 ms
Start4.0 s
RiskFOUT — text flashes from fallback to web font
proximanova-regular-web...woff2swap
Size23 KB
Load time41 ms
Start4.0 s
RiskFOUT — text flashes from fallback to web font
proximanova-semibold-we...woff2swap
Size23 KB
Load time44 ms
Start4.0 s
RiskFOUT — text flashes from fallback to web font
proximanova-bold-webfon...woff2swap
Size23 KB
Load time46 ms
Start4.0 s
RiskFOUT — text flashes from fallback to web font
sigvar_serial-light-web...woff2swap
Size22 KB
Load time47 ms
Start4.0 s
RiskFOUT — text flashes from fallback to web font
sia.woffwoffswap
Size22 KB
Load time50 ms
Start4.0 s
RiskFOUT — text flashes from fallback to web font
Convert to woff2 for ~30% smaller file size
sia-1.woffwoffswap
Size3 KB
Load time51 ms
Start4.0 s
RiskFOUT — text flashes from fallback to web font
Convert to woff2 for ~30% smaller file size
sia-3.woffwoffswap
Size2 KB
Load time54 ms
Start4.0 s
RiskFOUT — text flashes from fallback to web font
Convert to woff2 for ~30% smaller file size
sigvar_serial-light-web...ttfswap
Size30 KB
Load time63 ms
Start4.0 s
RiskFOUT — text flashes from fallback to web font
Convert to woff2 for ~30% smaller file size
proximanova-light-webfo...woff2swap
Size22 KB
Load time56 ms
Start4.0 s
RiskFOUT — text flashes from fallback to web font
proximanova-light-webfo...ttfswap
Size27 KB
Load time65 ms
Start4.0 s
RiskFOUT — text flashes from fallback to web font
Convert to woff2 for ~30% smaller file size
sia.ttfttfswap
Size22 KB
Load time57 ms
Start4.0 s
RiskFOUT — text flashes from fallback to web font
Convert to woff2 for ~30% smaller file size
sia-1.ttfttfswap
Size3 KB
Load time58 ms
Start4.0 s
RiskFOUT — text flashes from fallback to web font
Convert to woff2 for ~30% smaller file size
sia-3.ttfttfswap
Size2 KB
Load time49 ms
Start4.0 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 ~34 KB and ~68 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
Network Waterfall
134 requests over 6752ms
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-party9953ms · 1460KB · S$172/mo
Script
Category
Execution
Transfer
Unused
Monthly Cost
Verdict
www.singaporeair.com
www.singaporeair.com
Other
1796ms
428 KB
47%
S$31/mo
Costly
www.singaporeair.com
www.singaporeair.com
Other
1421ms
72 KB
—
S$25/mo
Costly
www.singaporeair.com
www.singaporeair.com
Other
1206ms
2 KB
21%
S$21/mo
Costly
Unattributable
Unattributable
Other
1154ms
0 KB
—
S$20/mo
Costly
www.singaporeair.com
www.singaporeair.com
Other
1088ms
154 KB
—
S$19/mo
Costly
www.singaporeair.com
www.singaporeair.com
Other
853ms
349 KB
45%
S$15/mo
Costly
www.singaporeair.com
www.singaporeair.com
Other
586ms
154 KB
18%
S$10/mo
Costly
www.singaporeair.com
www.singaporeair.com
Other
479ms
86 KB
40%
S$8/mo
Costly
www.singaporeair.com
www.singaporeair.com
Other
462ms
69 KB
40%
S$8/mo
Costly
www.singaporeair.com
www.singaporeair.com
Other
378ms
73 KB
37%
S$7/mo
Costly
www.singaporeair.com
www.singaporeair.com
Other
205ms
28 KB
—
S$4/mo
Costly
www.singaporeair.com
www.singaporeair.com
Other
152ms
7 KB
—
S$3/mo
Optional
www.singaporeair.com
www.singaporeair.com
Other
116ms
8 KB
—
S$2/mo
Optional
www.singaporeair.com
www.singaporeair.com
Other
56ms
28 KB
—
S$1/mo
Optional
www.singaporeair.com
Other
Costly
Execution1796ms
Transfer428 KB
Unused47%
Monthly CostS$31/mo
www.singaporeair.com
Other
Costly
Execution1421ms
Transfer72 KB
Monthly CostS$25/mo
www.singaporeair.com
Other
Costly
Execution1206ms
Transfer2 KB
Unused21%
Monthly CostS$21/mo
Unattributable
Other
Costly
Execution1154ms
Transfer0 KB
Monthly CostS$20/mo
www.singaporeair.com
Other
Costly
Execution1088ms
Transfer154 KB
Monthly CostS$19/mo
www.singaporeair.com
Other
Costly
Execution853ms
Transfer349 KB
Unused45%
Monthly CostS$15/mo
www.singaporeair.com
Other
Costly
Execution586ms
Transfer154 KB
Unused18%
Monthly CostS$10/mo
www.singaporeair.com
Other
Costly
Execution479ms
Transfer86 KB
Unused40%
Monthly CostS$8/mo
www.singaporeair.com
Other
Costly
Execution462ms
Transfer69 KB
Unused40%
Monthly CostS$8/mo
www.singaporeair.com
Other
Costly
Execution378ms
Transfer73 KB
Unused37%
Monthly CostS$7/mo
www.singaporeair.com
Other
Costly
Execution205ms
Transfer28 KB
Monthly CostS$4/mo
www.singaporeair.com
Other
Optional
Execution152ms
Transfer7 KB
Monthly CostS$3/mo
www.singaporeair.com
Other
Optional
Execution116ms
Transfer8 KB
Monthly CostS$2/mo
www.singaporeair.com
Other
Optional
Execution56ms
Transfer28 KB
Monthly CostS$1/mo
These scripts may cost more than they're worth
www.singaporeair.com adds 1796ms and costs ~S$31/month
www.singaporeair.com adds 1421ms and costs ~S$25/month
www.singaporeair.com adds 1206ms and costs ~S$21/month
Unattributable adds 1154ms and costs ~S$20/month
www.singaporeair.com adds 1088ms and costs ~S$19/month
www.singaporeair.com adds 853ms and costs ~S$15/month
www.singaporeair.com adds 586ms and costs ~S$10/month
www.singaporeair.com adds 479ms and costs ~S$8/month
www.singaporeair.com adds 462ms and costs ~S$8/month
www.singaporeair.com adds 378ms and costs ~S$7/month
www.singaporeair.com adds 205ms and costs ~S$4/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.singaporeair.com takes 1796ms 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.singaporeair.com takes 1421ms 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.singaporeair.com takes 1206ms 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 1154ms 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.singaporeair.com takes 1088ms 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.singaporeair.com takes 853ms 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.singaporeair.com takes 586ms 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.singaporeair.com takes 479ms 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.singaporeair.com takes 462ms 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.singaporeair.com takes 378ms 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.singaporeair.com takes 205ms 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.