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.
3.56 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
9.33 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
623 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.027
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
6.42 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.
18.44 s
Page Load Progression
FPage Weight BudgetAction4.6 MB transferred, 129 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
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 Execution CostAction3434ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.inaturalist.org/ | 1095ms | 48ms | 6ms | 3rd |
| Unattributable | 1083ms | 17ms | 0ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-TV5BYME7B4 | 376ms | 293ms | 80ms | 3rd |
| https://www.inaturalist.org/cdn-cgi/challenge-platform/scripts/jsd/main.js | 348ms | 327ms | 11ms | 3rd |
| https://www.inaturalist.org/assets/jquery/jquery-ui-1.11.4.min-2450ef9a98171ec1ace29a307d003b85ece62de5210253ea9d1d2ab9f55b8aa9.js | 215ms | 50ms | 32ms | 3rd |
| https://www.inaturalist.org/assets/bootstrap_bundle-2dc38788ade2acdc683533f71ec128d48584d5b450e621341b0175f9b2d46105.js | 189ms | 95ms | 93ms | 3rd |
| https://www.inaturalist.org/assets/jquery/jquery-1.11.3.min-aa364d900c3098c524e5cadafee39ba08d15dda7a2ba81c1d81906cb86091822.js | 128ms | 91ms | 14ms | 3rd |
DPage Weight InventoryAction129 resources · 4.6 MB · 234 KB savings availableFIX
~234.1 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 129 resources | 4.6 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
CImage OptimizationAction101 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
CJS BundlesAction7 scripts, 234 KB unusedREVIEW
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.inaturalist.org/assets/bootstrap_bundle-2dc38788ade2acdc683533f71ec128d48584d5b450e621341b0175f9b2d46105.js | 187 KB | 111 KB (59%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-TV5BYME7B4 | 164 KB | 67 KB (41%) | ✓ | 3rd |
| https://www.inaturalist.org/assets/jquery/jquery-ui-1.11.4.min-2450ef9a98171ec1ace29a307d003b85ece62de5210253ea9d1d2ab9f55b8aa9.js | 63 KB | 57 KB (90%) | ✓ | 3rd |
| https://www.inaturalist.org/assets/jquery/jquery-1.11.3.min-aa364d900c3098c524e5cadafee39ba08d15dda7a2ba81c1d81906cb86091822.js | 33 KB | — | ✓ | 3rd |
| https://www.inaturalist.org/assets/i18n/translations/en-US-2fa6b60b8476900c2bf8014dabf951c281782414aab7b26a68518641370003fb.js | 2 KB | — | ✓ | 3rd |
| https://www.inaturalist.org/assets/welcome_v2-250bb932c5662cd7717380f00d28d7549870822062b4530c9f6366a5b60d8264.js | 1 KB | — | ✓ | 3rd |
| https://www.inaturalist.org/cdn-cgi/challenge-platform/h/b/scripts/jsd/0b8fb825cb67/main.js? | 12 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
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 Loading9 fonts (912 KB)PASS
Web fonts
9
912 KB total
Render-blocking
0
of 9
Dominant font-display
swap
Most common across fonts
Font loading timeline
- Convert to woff2 for ~30% smaller file size
- Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
- Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
- Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
- 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 ~364 KB and ~728 ms
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource Hints1 hints, 0 missing preconnectsPASS
Current Resource Hints
1 resource hints configured
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
Network Waterfall129 requests over 2817msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.inaturalist.org www.inaturalist.org | Other | 1095ms | 16 KB | — | $15/mo | Costly |
Unattributable Unattributable | Other | 1083ms | 0 KB | — | $14/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 376ms | 164 KB | 41% | $5/mo | Costly |
www.inaturalist.org www.inaturalist.org | Other | 348ms | 0 KB | — | $5/mo | Costly |
www.inaturalist.org www.inaturalist.org | Other | 215ms | 63 KB | 90% | $3/mo | Costly |
www.inaturalist.org www.inaturalist.org | Other | 189ms | 187 KB | 59% | $3/mo | Optional |
www.inaturalist.org www.inaturalist.org | Other | 128ms | 33 KB | — | $2/mo | Optional |
These scripts may cost more than they're worth
- www.inaturalist.org adds 1095ms and costs ~$15/month
- Unattributable adds 1083ms and costs ~$14/month
- Google Tag Manager adds 376ms and costs ~$5/month
- www.inaturalist.org adds 348ms and costs ~$5/month
- www.inaturalist.org adds 215ms 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
www.inaturalist.org takes 1095ms 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 1083ms 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 376ms 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.inaturalist.org takes 348ms 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.inaturalist.org 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
90% of www.inaturalist.org'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
59% of www.inaturalist.org'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