Performance
· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.Performance-focused optimization plan with CWV assessment, top offenders, and time estimates
First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.
1.55 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
2.97 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
910 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.002
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
2.58 s
Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.
6.59 s
Page Load Progression
FPage Weight BudgetAction4.2 MB transferred, 219 requestsFIX
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
JavaScript bundle is large — code-split routes and lazy-load off-screen components to defer.
Source: web.dev
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.
Source: web.dev
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
CSS bundle is large — purge unused styles (PurgeCSS, Tailwind JIT) to reduce CSS payload.
Source: web.dev
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.
Source: web.dev
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
FJS Execution CostAction4525ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://cdn.mxpnl.com/libs/mixpanel-recorder-BjSlYaNJ.min.js | 721ms | 697ms | 15ms | 3rd |
| https://www.topuniversities.com/ | 597ms | 12ms | 3ms | 3rd |
| Unattributable | 570ms | 36ms | 0ms | 3rd |
| https://www.topuniversities.com/sites/default/files/js/js_ddGU7MzyXbhpX9dF0Ex0oMUT4wKYS_Wa7xYHr0NuwHQ.js?scope=footer&delta=0&language=en&theme=tu_d8&include=eJyNUstygzAM_CGCZ3rqZ_TSs0fYAlSMRWQ7lL-veCRpZtJpDoy0q_VasgDvM0NcDBxJ3QrHXLkBPWUWC86xeOJobtkuwegrFwhjTuTRXiCQh6xl-3UuKItxl3rP6qvZq3pq8VXpUftfP0HOKLEeMfesnbOg8VImCHXLMj4QKatjqrBYxzwQahinQBAdmmdk1YGBCGHJ5FJ1ThZEs4Dmnq5sS4INJLQpsdHvFKj5iz_1CB5lKwf8FuxsSSgKeDbPyFXZBW4g2ERZvRDE9WYP9u7GedJaVGQe0Forkewk3FmvHTld2GJ-s-vAINso27VKtrRN-anwY0dVLta_m72VA-gBivqo-l_diIiz7XnUbb3dyeLt5A-YArnh5ED0rqtRmmnSVnew9ZCKXHCpZmzWLZoj1p4gcPcDdrkgKg | 551ms | 342ms | 19ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-W4T4GS | 295ms | 241ms | 30ms | 3rd |
| https://js-eu1.hs-analytics.net/analytics/1776805500000/25874232.js | 239ms | 173ms | 4ms | 3rd |
| https://pj.l.admedo.com/admtracker.lib.min.js | 208ms | 119ms | 0ms | 3rd |
| https://connect.facebook.net/signals/config/625118064239502?v=2.9.303&r=stable&domain=www.topuniversities.com&hme=97937018cefade17726f0472876fc101316b2ce9008a35a6a5a7977d7436151a&ex_m=104%2C205%2C154%2C22%2C72%2C73%2C145%2C68%2C67%2C11%2C162%2C90%2C16%2C138%2C127%2C39%2C75%2C78%2C134%2C159%2C164%2C8%2C4%2C5%2C7%2C6%2C3%2C91%2C101%2C165%2C170%2C219%2C62%2C186%2C187%2C55%2C276%2C30%2C74%2C231%2C230%2C229%2C23%2C33%2C103%2C61%2C10%2C63%2C97%2C98%2C99%2C105%2C130%2C31%2C29%2C132%2C133%2C129%2C128%2C155%2C76%2C158%2C156%2C157%2C50%2C60%2C123%2C15%2C161%2C45%2C263%2C264%2C262%2C26%2C27%2C28%2C48%2C146%2C77%2C112%2C18%2C20%2C44%2C40%2C42%2C41%2C83%2C92%2C96%2C110%2C144%2C147%2C46%2C111%2C24%2C21%2C119%2C69%2C36%2C149%2C148%2C150%2C141%2C139%2C25%2C35%2C59%2C109%2C160%2C70%2C17%2C152%2C114%2C81%2C66%2C19%2C85%2C86%2C116%2C84%2C136%2C135%2C34%2C278%2C293%2C212%2C201%2C202%2C200%2C296%2C288%2C52%2C213%2C107%2C131%2C80%2C121%2C54%2C47%2C49%2C113%2C120%2C126%2C58%2C64%2C151%2C115%2C37%2C32%2C53%2C56%2C100%2C163%2C1%2C124%2C14%2C122%2C12%2C2%2C57%2C93%2C65%2C118%2C89%2C88%2C166%2C167%2C94%2C95%2C9%2C125%2C102%2C51%2C142%2C87%2C79%2C71%2C117%2C106%2C43%2C143%2C0%2C82%2C137%2C140%2C153%2C38%2C108%2C13%2C168 | 162ms | 136ms | 17ms | 3rd |
| https://analytics.tiktok.com/i18n/pixel/static/main.MWE0ZWQ3ZWQwMQ.js | 161ms | 105ms | 18ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-MB43K5VF58&cx=c>m=4e64h1 | 143ms | 121ms | 19ms | 3rd |
Showing top 10 of 20 scripts
FJS BundlesAction66 scripts, 986 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604160201/pubads_impl.js | 188 KB | 144 KB (77%) | ✓ | 3rd |
| https://accounts.google.com/gsi/client | 96 KB | 71 KB (75%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-YN0B3DGTTZ&cx=c>m=4e64h1 | 172 KB | 67 KB (39%) | ✓ | 3rd |
| https://cdn.mxpnl.com/libs/mixpanel-recorder-BjSlYaNJ.min.js | 102 KB | 66 KB (65%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-MB43K5VF58&cx=c>m=4e64h1 | 157 KB | 63 KB (40%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/destination?id=DC-13510395&cx=c>m=4e64h1 | 130 KB | 62 KB (48%) | ✓ | 3rd |
| https://cdn.jsdelivr.net/npm/instantsearch.js@4.14.0/dist/instantsearch.production.min.js | 67 KB | 60 KB (91%) | ✓ | 3rd |
| https://analytics.tiktok.com/i18n/pixel/static/main.MWE0ZWQ3ZWQwMQ.js | 110 KB | 56 KB (52%) | ✓ | 3rd |
| https://cdnjs.cloudflare.com/ajax/libs/jqueryui/1.12.1/jquery-ui.min.js | 56 KB | 49 KB (89%) | ✓ | 3rd |
| https://www.topuniversities.com/sites/default/files/js/js_0GfU8t6p_yW3P2PemsvokN1HiQsQh2BVw26ryGO-p4I.js?scope=footer&delta=24&language=en&theme=tu_d8&include=eJyNUstygzAM_CGCZ3rqZ_TSs0fYAlSMRWQ7lL-veCRpZtJpDoy0q_VasgDvM0NcDBxJ3QrHXLkBPWUWC86xeOJobtkuwegrFwhjTuTRXiCQh6xl-3UuKItxl3rP6qvZq3pq8VXpUftfP0HOKLEeMfesnbOg8VImCHXLMj4QKatjqrBYxzwQahinQBAdmmdk1YGBCGHJ5FJ1ThZEs4Dmnq5sS4INJLQpsdHvFKj5iz_1CB5lKwf8FuxsSSgKeDbPyFXZBW4g2ERZvRDE9WYP9u7GedJaVGQe0Forkewk3FmvHTld2GJ-s-vAINso27VKtrRN-anwY0dVLta_m72VA-gBivqo-l_diIiz7XnUbb3dyeLt5A-YArnh5ED0rqtRmmnSVnew9ZCKXHCpZmzWLZoj1p4gcPcDdrkgKg | 47 KB | 42 KB (90%) | ✓ | 3rd |
Consider code splitting or tree shaking to reduce unused code.
This bundle has high unused code — code-split or tree-shake to ship only what executes.
Source: web.dev / Lighthouse coverage
Consider code splitting or tree shaking to reduce unused code.
This bundle has high unused code — code-split or tree-shake to ship only what executes.
Source: web.dev / Lighthouse coverage
Consider code splitting or tree shaking to reduce unused code.
This bundle has high unused code — code-split or tree-shake to ship only what executes.
Source: web.dev / Lighthouse coverage
Consider code splitting or tree shaking to reduce unused code.
This bundle has high unused code — code-split or tree-shake to ship only what executes.
Source: web.dev / Lighthouse coverage
Consider code splitting or tree shaking to reduce unused code.
This bundle has high unused code — code-split or tree-shake to ship only what executes.
Source: web.dev / Lighthouse coverage
FPage Weight InventoryAction219 resources · 4.2 MB · 986 KB savings availableFIX
~986.2 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 219 resources | 4.2 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
CImage OptimizationAction82 images, 0 KB saveableREVIEW
Set explicit width and height to prevent CLS.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.
Source: web.dev / Core Web Vitals
A+Text CompressionAll text resources are compressedPASS
A+Font Loading7 fonts (131 KB)PASS
Web fonts
7
131 KB total
Render-blocking
0
of 7
Dominant font-display
swap
Most common across fonts
Font loading timeline
- 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 ~8 KB and ~16 ms
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource HintsNo optimization neededPASS
A+Green HostingWhether the site is served from green-energy infrastructurePASS
Green Hosting
This site is hosted on green energy infrastructure
Provider: Cloudflare
Network Waterfall219 requests over 7354msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
Mixpanel cdn.mxpnl.com | Analytics | 721ms | 102 KB | 65% | $10/mo | Costly |
www.topuniversities.com www.topuniversities.com | Other | 597ms | 34 KB | — | $8/mo | Costly |
Unattributable Unattributable | Other | 570ms | 0 KB | — | $8/mo | Costly |
www.topuniversities.com www.topuniversities.com | Other | 551ms | 65 KB | 64% | $7/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 295ms | 188 KB | 29% | $4/mo | Costly |
js-eu1.hs-analytics.net js-eu1.hs-analytics.net | Other | 239ms | 42 KB | — | $3/mo | Costly |
pj.l.admedo.com pj.l.admedo.com | Other | 208ms | 4 KB | — | $3/mo | Costly |
Facebook Pixel connect.facebook.net | Advertising | 162ms | 127 KB | 28% | $2/mo | Optional |
analytics.tiktok.com analytics.tiktok.com | Other | 161ms | 110 KB | 52% | $2/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 143ms | 157 KB | 40% | $2/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 135ms | 172 KB | 39% | $2/mo | Optional |
try.abtasty.com try.abtasty.com | Other | 110ms | 60 KB | 48% | $1/mo | Optional |
www.topuniversities.com www.topuniversities.com | Other | 108ms | 51 KB | 76% | $1/mo | Optional |
content.qs.com content.qs.com | Other | 92ms | 42 KB | — | $1/mo | Optional |
securepubads.g.doubleclick.net securepubads.g.doubleclick.net | Other | 89ms | 188 KB | 77% | $1/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 85ms | 130 KB | 48% | $1/mo | Optional |
Facebook Pixel connect.facebook.net | Advertising | 77ms | 97 KB | 34% | $1/mo | Optional |
www.topuniversities.com www.topuniversities.com | Other | 64ms | 8 KB | — | $1/mo | Optional |
Hotjar script.hotjar.com | Session Replay | 61ms | 57 KB | 67% | $1/mo | Optional |
Mixpanel cdn.mxpnl.com | Analytics | 57ms | 32 KB | — | $1/mo | Optional |
These scripts may cost more than they're worth
- Mixpanel adds 721ms and costs ~$10/month
- www.topuniversities.com adds 597ms and costs ~$8/month
- Unattributable adds 570ms and costs ~$8/month
- www.topuniversities.com adds 551ms and costs ~$7/month
- Google Tag Manager adds 295ms and costs ~$4/month
- js-eu1.hs-analytics.net adds 239ms and costs ~$3/month
- pj.l.admedo.com adds 208ms and costs ~$3/month
100% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.
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
Mixpanel takes 721ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
65% of Mixpanel's code is unused. The script may be loading features you don't use.
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev
www.topuniversities.com takes 597ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
Unattributable takes 570ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
www.topuniversities.com takes 551ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
64% of www.topuniversities.com's code is unused. The script may be loading features you don't use.
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev
Google Tag Manager takes 295ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
js-eu1.hs-analytics.net takes 239ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
pj.l.admedo.com takes 208ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
52% of analytics.tiktok.com's code is unused. The script may be loading features you don't use.
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev
76% of www.topuniversities.com's code is unused. The script may be loading features you don't use.
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev
77% of securepubads.g.doubleclick.net's code is unused. The script may be loading features you don't use.
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev
67% of Hotjar's code is unused. The script may be loading features you don't use.
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev