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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
93
GRADE
A
FIX
2
REVIEW
1
PASS
12
INFO
2

Performance-focused optimization plan with CWV assessment, top offenders, and time estimates

Mobile Desktop
0
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
45
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
73
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
36
SEO Measures basic SEO optimizations: meta tags, crawlability, link text, and mobile friendliness.

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

0 ms

Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.

0 ms

Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.

0 ms

Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.

0.000

Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.

0 ms

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

0 ms

Page Load Progression

375 ms
750 ms
1.1 s
1.5 s
1.9 s
2.2 s
2.6 s
3.0 s
Checks
17
12 PASS 1 REVIEW 2 FIX
D
Third-Party Impact
Action
94% third-party, 0 ms blocking
FIX
94% third-party, 0 ms blocking
Warning::
Third-party code accounts for 94% of page weight (683.0 KiB of 727.2 KiB)
Info::
Third-party blocking time is low (0 ms)
94%
First-party Third-party
D
HTTP Caching
Action
no-store (uncacheable)
FIX
no-store (uncacheable)
Info::
Cache-Control: no-store prevents all caching
Intentional for dynamic content, but increases server load for every page view.
Got: no-cache, no-store
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

no-cache, no-store

DirectiveValueMeaning
no-cache—Cache but always revalidate first
no-store—Never cache this response
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A
Page Weight Budget
727 KB transferred, 18 requests
PASS
727 KB transferred, 18 requests
Info::
Page weighs 2.5 MB (727 KB transferred)
Info::
18 HTTP requests
Info::
Estimated 0.15 g CO2 per page load
727 KB / 2.4 MB budget
727 KB transferred
18 requests
0.15 g CO2 per page load
JavaScript 483.9 KiB 67%
HTML 168.2 KiB 23%
Fonts 47.3 KiB 7%
Images 18.4 KiB 3%
Other 4.0 KiB 1%
Other 3.1 KiB 0%
CSS 1.1 KiB 0%
Other 1.1 KiB 0%
0 2.4 MB 4.9 MB
Under budget
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
Image Optimization
4 images, 0 KB saveable
PASS
4 images, 0 KB saveable
Info::
All images are well-optimized
4 images 18 KB
0 oversized -0 KB
2 legacy format
0 missing dimensions CLS risk
A+
JS Execution Cost
477ms total JS execution
PASS
477ms total JS execution
Info::
https://js.hcaptcha.com/1/api.js: 231ms CPU time
Info::
Unattributable: 177ms CPU time
Info::
https://nus.edu.sg/_Incapsula_Resource?SWJIYLWA=71...: 70ms CPU time
Warning::
Third-party scripts: 407ms (85% of total)

Main Thread Breakdown

Script Evaluation 40% Other 39% Script Parsing & Compilation 8% Style & Layout 8%
ScriptTotalScriptingParse/CompileParty
https://js.hcaptcha.com/1/api.js231ms156ms36ms3rd
Unattributable177ms6ms0ms3rd
https://nus.edu.sg/_Incapsula_Resource?SWJIYLWA=719d34d31c8e3a6e6fffd425f7e032f370ms59ms10ms1st
A+
Font Loading
1 fonts (47 KB)
PASS
1 fonts (47 KB)
Info::
1 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

1

47 KB total

Render-blocking

0

of 1

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 500 ms 1.0 shttps://fonts.gstatic.com/s/inter/v20/UcC73FwrK3iLTeHuS_nVMrMxCp50SjIa1ZL7W0Q5nw.woff2UcC73FwrK3iLTeHuS_nVMrM... https://fonts.gstatic.com/s/inter/v20/UcC73FwrK3iLTeHuS_nVMrMxCp50SjIa1ZL7W0Q5nw.woff2 — 47.3 KiB — 16 ms — font-display: swap
UcC73FwrK3iLTeHuS_nVMrM... woff2 swap
Size 47 KB
Load time 16 ms
Start 1.3 s
Risk FOUT — 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+
JS Bundles
3 scripts, 0 KB unused
PASS
3 scripts, 0 KB unused
0 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://nus.edu.sg/_Incapsula_Resource?SWJIYLWA=719d34d31c8e3a6e6fffd425f7e032f320 KB—✓1st
https://js.hcaptcha.com/1/api.js86 KB—✓3rd
https://newassets.hcaptcha.com/c/d48c491644d555edb0e283c66c2698dbaec44c9f1c02167e386f51f75a8d27bb/hsw.js378 KB—✓3rd
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
Page Weight Inventory
18 resources · 727 KB · 0 KB savings available
PASS
18 resources · 727 KB · 0 KB savings available
Info::
Within 1MB page-weight target
Got: 727 KB
Warning::
12 third-party resources (94% of weight)
Info::
1 resources over 200KB
18 resources · 727.2 KiB · 12 third-party Within 1MB page-weight target
JavaScript 67% · 483.9 KiB
Document 24% · 171.3 KiB
Font 7% · 47.3 KiB
Image 3% · 22.4 KiB
CSS 0% · 1.1 KiB
Other 0% · 1.1 KiB
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
18 requests over 3037ms
INFO
0 ms 1.0 s 2.0 s 3.0 shttps://nus.edu.sg// https://nus.edu.sg/ — 200 — 1.3 KiB — 713 ms — h2https://nus.edu.sg/_Incapsula_Resource?SWJIYLWA=719d34d31c8e3a6e6fffd425f7e032f3/_Incapsula_Resource?SWJIYLWA=719d3... https://nus.edu.sg/_Incapsula_Resource?SWJIYLWA=719d34d31c8e3a6e6fffd425f7e032f3 — 200 — 19.7 KiB — 230 ms — h2https://nus.edu.sg/_Incapsula_Resource?SWKMTFSR=1&e=0.13074420104873752/_Incapsula_Resource?SWKMTFSR=1&e=0... https://nus.edu.sg/_Incapsula_Resource?SWKMTFSR=1&e=0.13074420104873752 — 200 — 36 B — 121 ms — h2https://nus.edu.sg/_Incapsula_Resource?SWUDNSAI=31&xinfo=9-17047675-0%200NNN%20RT%281776805787676%20143%29%20q%280%20-1%20-1%20-1%29%20r%280%20-1%29%20B12%284%2c315%2c0%29%20U18&incident_id=8079000650066629339-78738875757826121&edet=12&cinfo=04000000&rpinfo=0&cts=renYulhv04gzm4NJDI4pK86mSo18Iamo4VL1z%2bHVu1wLQsTc8ualfs1blQkHumRO&cip=213.156.150.18&mth=GET/_Incapsula_Resource?SWUDNSAI=31&xi... https://nus.edu.sg/_Incapsula_Resource?SWUDNSAI=31&xinfo=9-17047675-0%200NNN%20RT%281776805787676%20143%29%20q%280%20-1%20-1%20-1%29%20r%280%20-1%29%20B12%284%2c315%2c0%29%20U18&incident_id=8079000650066629339-78738875757826121&edet=12&cinfo=04000000&rpinfo=0&cts=renYulhv04gzm4NJDI4pK86mSo18Iamo4VL1z%2bHVu1wLQsTc8ualfs1blQkHumRO&cip=213.156.150.18&mth=GET — 200 — 1.7 KiB — 126 ms — h2https://fonts.googleapis.com/css2?family=Inter:wght@400;500&display=swapfonts.googleapis.com/css2?family=In... https://fonts.googleapis.com/css2?family=Inter:wght@400;500&display=swap — 200 — 1.1 KiB — 133 ms — h2https://nus.edu.sg/images/default-source/logo/white.png/images/default-source/logo/white.p... https://nus.edu.sg/images/default-source/logo/white.png — 200 — 18.4 KiB — 118 ms — h2https://js.hcaptcha.com/1/api.jsjs.hcaptcha.com/1/api.js https://js.hcaptcha.com/1/api.js — 200 — 86.0 KiB — 49 ms — h3https://newassets.hcaptcha.com/captcha/v1/7d7b8b396198c8eb285d18bbc376e49a41bb440a/static/hcaptcha.htmlnewassets.hcaptcha.com/captcha/v1/7... https://newassets.hcaptcha.com/captcha/v1/7d7b8b396198c8eb285d18bbc376e49a41bb440a/static/hcaptcha.html — 200 — 165.2 KiB — 81 ms — h3https://newassets.hcaptcha.com/captcha/v1/7d7b8b396198c8eb285d18bbc376e49a41bb440a/static/hcaptcha.htmlnewassets.hcaptcha.com/captcha/v1/7... https://newassets.hcaptcha.com/captcha/v1/7d7b8b396198c8eb285d18bbc376e49a41bb440a/static/hcaptcha.html — 200 — 0 B — 73 ms — h3https://fonts.gstatic.com/s/inter/v20/UcC73FwrK3iLTeHuS_nVMrMxCp50SjIa1ZL7W0Q5nw.woff2fonts.gstatic.com/s/inter/v20/UcC73... https://fonts.gstatic.com/s/inter/v20/UcC73FwrK3iLTeHuS_nVMrMxCp50SjIa1ZL7W0Q5nw.woff2 — 200 — 47.3 KiB — 16 ms — h3https://38fdce58f5b8.w.hcaptcha.com/logo.png38fdce58f5b8.w.hcaptcha.com/logo.pn... https://38fdce58f5b8.w.hcaptcha.com/logo.png — 200 — 2.0 KiB — 25 ms — http/1.1data:image/gif;base64,R0lGODlhyADIAPQZAPb29vX19e3t7fT09Orq6vLy8u7u7vv7++np6ezs7Ovr6+jo6O/v7/r6+vj4+…data:image/gif;base64,R0lGODlhyADIA... data:image/gif;base64,R0lGODlhyADIAPQZAPb29vX19e3t7fT09Orq6vLy8u7u7vv7++np6ezs7Ovr6+jo6O/v7/r6+vj4+… — 200 — 0 B — 1 ms — datahttps://api.hcaptcha.com/checksiteconfig?v=7d7b8b396198c8eb285d18bbc376e49a41bb440a&host=nus.edu.sg&sitekey=dd6e16a7-972e-47d2-93d0-96642fb6d8de&sc=1&swa=1&spst=1api.hcaptcha.com/checksiteconfig?v=... https://api.hcaptcha.com/checksiteconfig?v=7d7b8b396198c8eb285d18bbc376e49a41bb440a&host=nus.edu.sg&sitekey=dd6e16a7-972e-47d2-93d0-96642fb6d8de&sc=1&swa=1&spst=1 — 200 — 1.1 KiB — 37 ms — h3data:image/gif;base64,R0lGODlhyADIAPQZAPb29vX19e3t7fT09Orq6vLy8u7u7vv7++np6ezs7Ovr6+jo6O/v7/r6+vj4+…data:image/gif;base64,R0lGODlhyADIA... data:image/gif;base64,R0lGODlhyADIAPQZAPb29vX19e3t7fT09Orq6vLy8u7u7vv7++np6ezs7Ovr6+jo6O/v7/r6+vj4+… — 200 — 0 B — 1 ms — datahttps://1f76d3b0dbd7.w.hcaptcha.com/logo.png1f76d3b0dbd7.w.hcaptcha.com/logo.pn... https://1f76d3b0dbd7.w.hcaptcha.com/logo.png — 200 — 2.0 KiB — 28 ms — http/1.1data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAEAAAABACAYAAACqaXHeAAAABmJLR0QA/wD/AP+gvaeTAAAC00lEQ…data:image/png;base64,iVBORw0KGgoAA... data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAEAAAABACAYAAACqaXHeAAAABmJLR0QA/wD/AP+gvaeTAAAC00lEQ… — 200 — 0 B — 0 ms — datahttps://newassets.hcaptcha.com/c/d48c491644d555edb0e283c66c2698dbaec44c9f1c02167e386f51f75a8d27bb/hsw.jsnewassets.hcaptcha.com/c/d48c491644... https://newassets.hcaptcha.com/c/d48c491644d555edb0e283c66c2698dbaec44c9f1c02167e386f51f75a8d27bb/hsw.js — 200 — 378.2 KiB — 32 ms — h3https://nus.edu.sg/favicon.ico/favicon.ico https://nus.edu.sg/favicon.ico — 200 — 3.1 KiB — 1.3 s — h2
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
85% of JavaScript execution is third-party
First-party Third-party 407ms · 86KB · S$7/mo
js.hcaptcha.com
Other
Costly
Execution 231ms
Transfer 86 KB
Monthly Cost S$4/mo
Unattributable
Other
Optional
Execution 177ms
Transfer 0 KB
Monthly Cost S$3/mo

These scripts may cost more than they're worth

  • js.hcaptcha.com adds 231ms and costs ~S$4/month

85% 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

js.hcaptcha.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

How third-party costs are calculated

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

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