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.
3.07 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
11.24 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
1.25 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.
6.64 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.
13.81 s
Page Load Progression
DPage Weight BudgetAction2.5 MB transferred, 96 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
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
FJS Execution CostAction4937ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://assets.tumblr.com/pop/js/modern/vendor-b6411a75.js | 2873ms | 2278ms | 66ms | 3rd |
| https://assets.tumblr.com/pop/js/modern/main-39845d6d.js | 560ms | 464ms | 68ms | 3rd |
| Unattributable | 424ms | 17ms | 0ms | 3rd |
| https://www.tumblr.com/ | 412ms | 37ms | 5ms | 3rd |
| https://assets.tumblr.com/pop/js/modern/landing-page-or-dashboard-picker-a70eeee8.js | 353ms | 352ms | 0ms | 3rd |
| https://assets.tumblr.com/pop/js/modern/error-reporter-b390f92d.js | 258ms | 116ms | 48ms | 3rd |
| https://assets.tumblr.com/pop/shared-styles-a8867947.css | 57ms | 0ms | 0ms | 3rd |
DJS BundlesAction47 scripts, 372 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://assets.tumblr.com/pop/js/modern/error-reporter-b390f92d.js | 116 KB | 100 KB (87%) | ✓ | 3rd |
| https://assets.tumblr.com/pop/js/modern/vendor-b6411a75.js | 142 KB | 62 KB (44%) | ✓ | 3rd |
| https://assets.tumblr.com/pop/js/modern/6768-3ed6fb2e.js | 55 KB | 48 KB (87%) | ✓ | 3rd |
| https://assets.tumblr.com/pop/js/modern/main-39845d6d.js | 124 KB | 38 KB (31%) | ✓ | 3rd |
| https://assets.tumblr.com/pop/js/modern/9656-1dcdf73c.js | 51 KB | 38 KB (75%) | ✓ | 3rd |
| https://assets.tumblr.com/pop/js/modern/4348-03bd8d49.js | 47 KB | 37 KB (80%) | ✓ | 3rd |
| https://assets.tumblr.com/pop/js/modern/6666-0fe53f2e.js | 35 KB | 29 KB (84%) | ✓ | 3rd |
| https://assets.tumblr.com/pop/js/modern/1615-a64903c4.js | 26 KB | 20 KB (79%) | ✓ | 3rd |
| https://assets.tumblr.com/pop/js/modern/302-d9cc8c1c.js | 8 KB | — | ✓ | 3rd |
| https://assets.tumblr.com/pop/js/modern/530-16d48d60.js | 6 KB | — | ✓ | 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
DPage Weight InventoryAction96 resources · 2.5 MB · 372 KB savings availableFIX
~372.3 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 96 resources | 2.5 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
BImage Optimization29 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 Loading4 fonts (189 KB)PASS
Web fonts
4
189 KB total
Render-blocking
0
of 4
Dominant font-display
swap
Most common across fonts
Font loading timeline
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)
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource Hints4 hints, 0 missing preconnectsPASS
Current Resource Hints
4 resource hints configured
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
Network Waterfall96 requests over 1395msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
assets.tumblr.com assets.tumblr.com | Other | 2873ms | 142 KB | 44% | $38/mo | Costly |
assets.tumblr.com assets.tumblr.com | Other | 560ms | 124 KB | 31% | $7/mo | Costly |
Unattributable Unattributable | Other | 424ms | 0 KB | — | $6/mo | Costly |
www.tumblr.com www.tumblr.com | Other | 412ms | 19 KB | — | $5/mo | Costly |
assets.tumblr.com assets.tumblr.com | Other | 353ms | 1 KB | — | $5/mo | Costly |
assets.tumblr.com assets.tumblr.com | Other | 258ms | 116 KB | 87% | $3/mo | Costly |
assets.tumblr.com assets.tumblr.com | Other | 57ms | 103 KB | — | $1/mo | Optional |
These scripts may cost more than they're worth
- assets.tumblr.com adds 2873ms and costs ~$38/month
- assets.tumblr.com adds 560ms and costs ~$7/month
- Unattributable adds 424ms and costs ~$6/month
- www.tumblr.com adds 412ms and costs ~$5/month
- assets.tumblr.com adds 353ms and costs ~$5/month
- assets.tumblr.com adds 258ms 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
assets.tumblr.com takes 2873ms 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
assets.tumblr.com takes 560ms 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 424ms 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.tumblr.com takes 412ms 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
assets.tumblr.com takes 353ms 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
assets.tumblr.com takes 258ms 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
87% of assets.tumblr.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