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.
834 ms
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
6.29 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
389 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.001
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
4.17 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.
6.57 s
Page Load Progression
FPage Weight BudgetAction4.8 MB transferred, 224 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 ImpactAction98% third-party, 0 ms blockingFIX
DJS Execution CostAction2357ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://cdn.wetransfer.com/_next/static/chunks/framework-ca2f8fe4a887959b.js | 797ms | 691ms | 19ms | 3rd |
| https://tagging.wetransfer.com/gtm.js?id=GTM-NS54WBW | 264ms | 224ms | 32ms | 3rd |
| https://cdn.wetransfer.com/_next/static/chunks/7354.30a5a0411a6507e5.js | 255ms | 156ms | 60ms | 3rd |
| Unattributable | 215ms | 21ms | 0ms | 3rd |
| https://cdn.wetransfer.com/_next/static/chunks/1639.4df9c4041275b2cc.js | 171ms | 151ms | 10ms | 3rd |
| https://wetransfer.com/ | 148ms | 6ms | 0ms | 1st |
| blob:https://wetransfer.com/ad72f200-adfe-4a50-934e-d5cc1ef70c0c | 99ms | 88ms | 6ms | 3rd |
| https://tagging.wetransfer.com/gtag/js?id=G-0M019DTWVR&cx=c>m=4e64h1&sign=68f7c7b92e64d7325499d93cd2b5412b3fd142343a0759bd66ca3d751f8db981_20260421 | 86ms | 74ms | 11ms | 3rd |
| https://scripts.clarity.ms/0.8.59/clarity.js | 78ms | 69ms | 4ms | 3rd |
| https://js.stripe.com/v3 | 69ms | 48ms | 20ms | 3rd |
Showing top 10 of 13 scripts
FJS BundlesAction74 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 | 806 KB | 273 KB (34%) | ✓ | 3rd |
| https://js.stripe.com/v3 | 225 KB | 163 KB (73%) | ✓ | 3rd |
| blob:https://wetransfer.com/ad72f200-adfe-4a50-934e-d5cc1ef70c0c | 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 | 69 KB (72%) | ✓ | 3rd |
| https://accounts.google.com/gsi/client | 96 KB | 69 KB (72%) | ✓ | 3rd |
| https://cdn.wetransfer.com/_next/static/chunks/9338.993d9483534aa86f.js | 123 KB | 68 KB (55%) | ✓ | 3rd |
| https://tagging.wetransfer.com/gtag/js?id=G-0M019DTWVR&cx=c>m=4e64h1&sign=68f7c7b92e64d7325499d93cd2b5412b3fd142343a0759bd66ca3d751f8db981_20260421 | 160 KB | 64 KB (40%) | ✓ | 3rd |
| https://tagging.wetransfer.com/gtag/js?id=G-0M019DTWVR&cx=c>m=4e64h1&sign=68f7c7b92e64d7325499d93cd2b5412b3fd142343a0759bd66ca3d751f8db981_20260421 | 0 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 InventoryAction224 resources · 4.8 MB · 1.4 MB savings availableFIX
~1.4 MiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 224 resources | 4.8 MiB | ||||||
DHTTP CachingActionno-store (uncacheable)FIX
private, no-cache, no-store, max-age=0, must-revalidate
| Directive | Value | Meaning |
|---|---|---|
| private | — | Only browser cache, not CDN/proxy |
| no-cache | — | Cache but always revalidate first |
| no-store | — | Never cache this response |
| max-age | 0 | Cache for 0 seconds |
| must-revalidate | — | Must recheck with server after expiry |
BImage Optimization7 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 Loading6 fonts (134 KB)PASS
Web fonts
6
134 KB total
Render-blocking
0
of 6
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 Waterfall224 requests over 5344msINFO
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 | 797ms | 0 KB | — | $11/mo | Costly |
tagging.wetransfer.com tagging.wetransfer.com | Other | 264ms | 0 KB | 41% | $4/mo | Costly |
cdn.wetransfer.com cdn.wetransfer.com | Other | 255ms | 806 KB | 34% | $3/mo | Costly |
Unattributable Unattributable | Other | 215ms | 0 KB | — | $3/mo | Costly |
cdn.wetransfer.com cdn.wetransfer.com | Other | 171ms | 85 KB | 57% | $2/mo | Optional |
wetransfer.com wetransfer.com | Other | 99ms | 0 KB | 43% | $1/mo | Optional |
tagging.wetransfer.com tagging.wetransfer.com | Other | 86ms | 0 KB | 40% | $1/mo | Optional |
Microsoft Clarity scripts.clarity.ms | Session Replay | 78ms | 0 KB | — | $1/mo | Optional |
Stripe js.stripe.com | Payment | 69ms | 225 KB | 73% | $1/mo | Essential |
cdn.wetransfer.com cdn.wetransfer.com | Other | 64ms | 123 KB | 55% | $1/mo | Optional |
cdn.wetransfer.com cdn.wetransfer.com | Other | 59ms | 0 KB | 77% | $1/mo | Optional |
apps.rokt.com apps.rokt.com | Other | 52ms | 21 KB | — | $1/mo | Optional |
These scripts may cost more than they're worth
- cdn.wetransfer.com adds 797ms and costs ~$11/month
- tagging.wetransfer.com adds 264ms and costs ~$4/month
- cdn.wetransfer.com adds 255ms and costs ~$3/month
- Unattributable adds 215ms and costs ~$3/month
94% 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 797ms 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
tagging.wetransfer.com takes 264ms 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 255ms 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 215ms 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
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
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
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