Performance
· 17 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.
7.25 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
22.35 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
1.96 s
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.
9.02 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.
22.67 s
Page Load Progression
FPage Weight BudgetAction3.7 MB transferred, 210 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
FJS Execution CostAction5027ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| Unattributable | 1125ms | 29ms | 0ms | 3rd |
| https://a.academia-assets.com/webpack_bundles/js/4543-4257cdf9b7a0c936.js | 756ms | 625ms | 12ms | 3rd |
| https://www.academia.edu/ | 682ms | 62ms | 13ms | 3rd |
| https://a.academia-assets.com/webpack_bundles/js/core_webpack.wjs-a114924156048b6e.js | 519ms | 379ms | 124ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-5VKX33P2DS | 364ms | 296ms | 65ms | 3rd |
| https://www.academia.edu/cdn-cgi/challenge-platform/scripts/jsd/main.js | 306ms | 292ms | 4ms | 3rd |
| https://www.googletagmanager.com/gtag/destination?id=AW-381421769&l=dataLayer_old&cx=c>m=4e64f0 | 265ms | 211ms | 51ms | 3rd |
| https://a.academia-assets.com/webpack_bundles/js/webpack_libraries_and_infrequently_changed.wjs-87f5221ae3c5408c.js | 262ms | 218ms | 12ms | 3rd |
| https://a.academia-assets.com/webpack_bundles/js/logged_out_home.wjs-7f9a8264d326ad84.js | 211ms | 157ms | 2ms | 3rd |
| https://accounts.google.com/gsi/client | 186ms | 95ms | 90ms | 3rd |
Showing top 10 of 14 scripts
DJS BundlesAction45 scripts, 475 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 | 83 KB (63%) | ✓ | 3rd |
| https://accounts.google.com/gsi/client | 96 KB | 70 KB (74%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-5VKX33P2DS | 165 KB | 64 KB (39%) | ✓ | 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 InventoryAction210 resources · 3.7 MB · 475 KB savings availableFIX
~474.9 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 210 resources | 3.7 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
CImage OptimizationAction127 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
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
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
Network Waterfall210 requests over 4078msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
Unattributable Unattributable | Other | 1125ms | 0 KB | — | $15/mo | Costly |
a.academia-assets.com a.academia-assets.com | Other | 756ms | 31 KB | — | $10/mo | Costly |
www.academia.edu www.academia.edu | Other | 682ms | 22 KB | — | $9/mo | Costly |
a.academia-assets.com a.academia-assets.com | Other | 519ms | 210 KB | 25% | $7/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 364ms | 165 KB | 39% | $5/mo | Costly |
www.academia.edu www.academia.edu | Other | 306ms | 0 KB | — | $4/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 265ms | 138 KB | 43% | $4/mo | Costly |
a.academia-assets.com a.academia-assets.com | Other | 262ms | 33 KB | 75% | $3/mo | Costly |
a.academia-assets.com a.academia-assets.com | Other | 211ms | 6 KB | — | $3/mo | Costly |
accounts.google.com accounts.google.com | Other | 186ms | 96 KB | 74% | $2/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 139ms | 133 KB | 63% | $2/mo | Optional |
Facebook Pixel connect.facebook.net | Advertising | 94ms | 78 KB | 72% | $1/mo | Optional |
a.academia-assets.com a.academia-assets.com | Other | 63ms | 3 KB | — | $1/mo | Optional |
static.cloudflareinsights.com static.cloudflareinsights.com | Other | 54ms | 11 KB | — | $1/mo | Optional |
These scripts may cost more than they're worth
- Unattributable adds 1125ms and costs ~$15/month
- a.academia-assets.com adds 756ms and costs ~$10/month
- www.academia.edu adds 682ms and costs ~$9/month
- a.academia-assets.com adds 519ms and costs ~$7/month
- Google Tag Manager adds 364ms and costs ~$5/month
- www.academia.edu adds 306ms and costs ~$4/month
- Google Tag Manager adds 265ms and costs ~$4/month
- a.academia-assets.com adds 262ms and costs ~$3/month
- a.academia-assets.com adds 211ms 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 1125ms 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
a.academia-assets.com takes 756ms 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 682ms 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
a.academia-assets.com takes 519ms 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
Google Tag Manager takes 364ms 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 306ms 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
Google Tag Manager takes 265ms 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
a.academia-assets.com takes 262ms 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
a.academia-assets.com takes 211ms 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
74% of accounts.google.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
63% of Google Tag Manager'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
72% of Facebook Pixel'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