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.
1.45 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
3.07 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
71 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.
1.88 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.
3.29 s
Page Load Progression
375 ms 750 ms
1.1 s
1.5 s 1.9 s 2.2 s 2.6 s 3.0 sFPage Weight BudgetAction4.4 MB transferred, 219 requestsFIX
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
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
Subset fonts to include only used characters, or switch to system font stacks.
Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).
Source: web.dev font loading
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
DJS BundlesAction45 scripts, 472 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.googletagmanager.com/gtm.js?id=GTM-5G9JF7Z&l=dataLayer_old | 133 KB | 82 KB (62%) | ✓ | 3rd |
| https://accounts.google.com/gsi/client | 96 KB | 67 KB (70%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-5VKX33P2DS | 165 KB | 65 KB (40%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/destination?id=AW-381421769&l=dataLayer_old&cx=c>m=4e64f0 | 138 KB | 60 KB (43%) | ✓ | 3rd |
| https://connect.facebook.net/en_US/bundle/sdk.js/ | 78 KB | 56 KB (72%) | ✓ | 3rd |
| https://a.academia-assets.com/webpack_bundles/js/core_webpack.wjs-a114924156048b6e.js | 210 KB | 49 KB (25%) | ✓ | 3rd |
| https://a.academia-assets.com/webpack_bundles/js/8629-b439736bcfef2791.js | 43 KB | 25 KB (59%) | ✓ | 3rd |
| https://a.academia-assets.com/webpack_bundles/js/webpack_libraries_and_infrequently_changed.wjs-87f5221ae3c5408c.js | 33 KB | 25 KB (75%) | ✓ | 3rd |
| https://a.academia-assets.com/webpack_bundles/js/design_system-2a25dbc2c93dddef.js | 26 KB | 22 KB (86%) | ✓ | 3rd |
| https://a.academia-assets.com/webpack_bundles/js/7963-e6e53b81fe1594cc.js | 30 KB | 21 KB (71%) | ✓ | 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 · 4.4 MB · 472 KB savings availableFIX
~471.8 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 219 resources | 4.4 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
CImage OptimizationAction134 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
CJS Execution CostAction1107ms total JS executionREVIEW
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| Unattributable | 329ms | 6ms | 0ms | 3rd |
| https://www.academia.edu/ | 216ms | 29ms | 11ms | 3rd |
| https://a.academia-assets.com/webpack_bundles/js/core_webpack.wjs-a114924156048b6e.js | 132ms | 97ms | 32ms | 3rd |
| https://www.academia.edu/cdn-cgi/challenge-platform/scripts/jsd/main.js | 89ms | 86ms | 1ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-5VKX33P2DS | 87ms | 70ms | 16ms | 3rd |
| https://a.academia-assets.com/webpack_bundles/js/webpack_libraries_and_infrequently_changed.wjs-87f5221ae3c5408c.js | 80ms | 54ms | 4ms | 3rd |
| https://www.googletagmanager.com/gtag/destination?id=AW-381421769&l=dataLayer_old&cx=c>m=4e64f0 | 65ms | 52ms | 13ms | 3rd |
| https://a.academia-assets.com/webpack_bundles/js/4543-4257cdf9b7a0c936.js | 58ms | 49ms | 3ms | 3rd |
| https://a.academia-assets.com/webpack_bundles/js/logged_out_home.wjs-7f9a8264d326ad84.js | 52ms | 47ms | 1ms | 3rd |
CGreen HostingActionWhether the site is served from green-energy infrastructureREVIEW
Green Hosting
No green hosting detected
A+Text CompressionAll text resources are compressedPASS
A+Font Loading5 fonts (403 KB)PASS
Web fonts
5
403 KB total
Render-blocking
0
of 5
Dominant font-display
swap
Most common across fonts
Font loading timeline
- 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 ~138 KB and ~276 ms
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource HintsNo optimization neededPASS
Network Waterfall219 requests over 2987msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
Unattributable Unattributable | Other | 329ms | 0 KB | — | $4/mo | Costly |
www.academia.edu www.academia.edu | Other | 216ms | 22 KB | — | $3/mo | Costly |
a.academia-assets.com a.academia-assets.com | Other | 132ms | 210 KB | 25% | $2/mo | Optional |
www.academia.edu www.academia.edu | Other | 89ms | 0 KB | — | $1/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 87ms | 165 KB | 40% | $1/mo | Optional |
a.academia-assets.com a.academia-assets.com | Other | 80ms | 33 KB | 75% | $1/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 65ms | 138 KB | 43% | $1/mo | Optional |
a.academia-assets.com a.academia-assets.com | Other | 58ms | 31 KB | — | $1/mo | Optional |
a.academia-assets.com a.academia-assets.com | Other | 52ms | 6 KB | — | $1/mo | Optional |
These scripts may cost more than they're worth
- Unattributable adds 329ms and costs ~$4/month
- www.academia.edu adds 216ms 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
Unattributable takes 329ms 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.academia.edu takes 216ms 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
75% of a.academia-assets.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