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.
1.14 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
6.36 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
607 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.011
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
6.69 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.
7.28 s
Page Load Progression
FPage Weight BudgetAction5.1 MB transferred, 237 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
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
DJS Execution CostAction3398ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://cdn.wetransfer.com/_next/static/chunks/framework-ca2f8fe4a887959b.js | 907ms | 783ms | 21ms | 3rd |
| Unattributable | 341ms | 53ms | 0ms | 3rd |
| https://cdn.wetransfer.com/_next/static/chunks/7354.30a5a0411a6507e5.js | 333ms | 186ms | 68ms | 3rd |
| https://wetransfer.com/ | 293ms | 20ms | 0ms | 3rd |
| https://cdn.wetransfer.com/_next/static/chunks/1639.4df9c4041275b2cc.js | 259ms | 236ms | 8ms | 3rd |
| https://tagging.wetransfer.com/gtm.js?id=GTM-NS54WBW | 193ms | 165ms | 19ms | 3rd |
| blob:https://wetransfer.com/1a8ce49c-e216-4427-9a51-96c4b07b6256 | 173ms | 153ms | 10ms | 3rd |
| https://scripts.clarity.ms/0.8.59/clarity.js | 143ms | 122ms | 9ms | 3rd |
| https://cdn.cookielaw.org/scripttemplates/202512.1.0/otBannerSdk.js | 136ms | 93ms | 18ms | 3rd |
| https://tagging.wetransfer.com/gtag/js?id=G-0M019DTWVR&cx=c>m=4e64h1&sign=58490bad11fe6de4a520b748391e1e90133617af0ae600e34d46636b7a0ff566_20260421 | 126ms | 103ms | 21ms | 3rd |
Showing top 10 of 17 scripts
FJS BundlesAction73 scripts, 1.4 MB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://cdn.wetransfer.com/_next/static/chunks/7354.30a5a0411a6507e5.js | 805 KB | 273 KB (34%) | ✓ | 3rd |
| https://js.stripe.com/v3 | 220 KB | 160 KB (73%) | ✓ | 3rd |
| blob:https://wetransfer.com/1a8ce49c-e216-4427-9a51-96c4b07b6256 | 0 KB | 153 KB (43%) | ✓ | 3rd |
| https://tagging.wetransfer.com/gtm.js?id=GTM-NS54WBW | 173 KB | 71 KB (41%) | ✓ | 3rd |
| https://tagging.wetransfer.com/gtm.js?id=GTM-NS54WBW | 0 KB | 71 KB (41%) | ✓ | 3rd |
| https://accounts.google.com/gsi/client | 0 KB | 68 KB (71%) | ✓ | 3rd |
| https://accounts.google.com/gsi/client | 96 KB | 68 KB (71%) | ✓ | 3rd |
| https://cdn.wetransfer.com/_next/static/chunks/9338.993d9483534aa86f.js | 123 KB | 67 KB (55%) | ✓ | 3rd |
| https://cdn.cookielaw.org/scripttemplates/202512.1.0/otBannerSdk.js | 126 KB | 66 KB (52%) | ✓ | 3rd |
| https://tagging.wetransfer.com/gtag/js?id=G-0M019DTWVR&cx=c>m=4e64h1&sign=58490bad11fe6de4a520b748391e1e90133617af0ae600e34d46636b7a0ff566_20260421 | 160 KB | 64 KB (40%) | ✓ | 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 InventoryAction237 resources · 5.1 MB · 1.4 MB savings availableFIX
~1.4 MiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 237 resources | 5.1 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
BImage Optimization10 images, 0 KB saveableREVIEW
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 Loading8 fonts (193 KB)PASS
Web fonts
8
193 KB total
Render-blocking
0
of 8
Dominant font-display
swap
Most common across fonts
Font loading timeline
- Convert to woff2 for ~30% smaller file size
- 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 ~15 KB and ~30 ms
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource HintsNo optimization neededPASS
Network Waterfall237 requests over 7833msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
cdn.wetransfer.com cdn.wetransfer.com | Other | 907ms | 0 KB | — | $12/mo | Costly |
Unattributable Unattributable | Other | 341ms | 0 KB | — | $5/mo | Costly |
cdn.wetransfer.com cdn.wetransfer.com | Other | 333ms | 805 KB | 34% | $4/mo | Costly |
wetransfer.com wetransfer.com | Other | 293ms | 8 KB | — | $4/mo | Costly |
cdn.wetransfer.com cdn.wetransfer.com | Other | 259ms | 85 KB | 57% | $3/mo | Costly |
tagging.wetransfer.com tagging.wetransfer.com | Other | 193ms | 0 KB | 41% | $3/mo | Optional |
wetransfer.com wetransfer.com | Other | 173ms | 0 KB | 43% | $2/mo | Optional |
Microsoft Clarity scripts.clarity.ms | Session Replay | 143ms | 0 KB | — | $2/mo | Optional |
OneTrust cdn.cookielaw.org | Consent | 136ms | 126 KB | 52% | $2/mo | Essential |
tagging.wetransfer.com tagging.wetransfer.com | Other | 126ms | 160 KB | 40% | $2/mo | Optional |
cdn.wetransfer.com cdn.wetransfer.com | Other | 89ms | 123 KB | 55% | $1/mo | Optional |
Stripe js.stripe.com | Payment | 87ms | 220 KB | 73% | $1/mo | Essential |
cdn.wetransfer.com cdn.wetransfer.com | Other | 73ms | 0 KB | 54% | $1/mo | Optional |
cdn.wetransfer.com cdn.wetransfer.com | Other | 69ms | 0 KB | 77% | $1/mo | Optional |
cdn.wetransfer.com cdn.wetransfer.com | Other | 65ms | 135 KB | 39% | $1/mo | Optional |
apps.rokt.com apps.rokt.com | Other | 55ms | 21 KB | — | $1/mo | Optional |
Bing UET bat.bing.com | Advertising | 53ms | 0 KB | — | $1/mo | Optional |
These scripts may cost more than they're worth
- cdn.wetransfer.com adds 907ms and costs ~$12/month
- Unattributable adds 341ms and costs ~$5/month
- cdn.wetransfer.com adds 333ms and costs ~$4/month
- wetransfer.com adds 293ms and costs ~$4/month
- cdn.wetransfer.com adds 259ms 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
cdn.wetransfer.com takes 907ms 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 341ms 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
cdn.wetransfer.com takes 333ms 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
wetransfer.com takes 293ms 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
cdn.wetransfer.com takes 259ms 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
57% of cdn.wetransfer.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
52% of OneTrust'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
55% of cdn.wetransfer.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
73% of Stripe'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
54% of cdn.wetransfer.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 cdn.wetransfer.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