https://a16z.com
Performance
· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.SCORE
79
GRADE
C
FIX
3
REVIEW
3
PASS
7
INFO
2
Performance-focused optimization plan with CWV assessment, top offenders, and time estimates
97
83
100
100
First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.
774 ms
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
1.01 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
0 ms
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.
1.25 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.
1.01 s
Page Load Progression
431 ms
863 ms
1.3 s
1.7 s
2.2 s 2.6 s
3.0 s
3.5 sChecks
157 PASS 3 REVIEW 3 FIX
FPage Weight BudgetAction7.3 MB transferred, 21 requestsFIX
Page Weight Budget
Action7.3 MB transferred, 21 requests
7.3 MB transferred, 21 requests
Critical::
Page weighs 7.1 MB (7.3 MB transferred)
Info::
21 HTTP requests
Info::
Estimated 1.5 g CO2 per page load
7.3 MB transferred
21 requests
1.5 g CO2 per page load
Other 6.9 MiB 95%
Images 117.3 KiB 2%
JavaScript 102.8 KiB 1%
Fonts 96.8 KiB 1%
CSS 71.4 KiB 1%
HTML 20.0 KiB 0%
Other 855 B 0%
0 2.4 MB 4.9 MB
Over budget
DThird-Party ImpactAction95% third-party, 0 ms blockingFIX
Third-Party Impact
Action95% third-party, 0 ms blocking
95% third-party, 0 ms blocking
Warning::
Third-party code accounts for 95% of page weight (6.9 MiB of 7.3 MiB)
Info::
Third-party blocking time is low (0 ms)
95%
First-party Third-party
DPage Weight InventoryAction21 resources · 7.3 MB · 0 KB savings availableFIX
Page Weight Inventory
Action21 resources · 7.3 MB · 0 KB savings available
21 resources · 7.3 MB · 0 KB savings available
Warning::
Page weight 6.3 MB over 1MB target
Got: 7.3 MB Expected: ≤ 1 MB
Warning::
7 third-party resources (95% of weight)
Info::
1 resources over 200KB
21 resources · 7.3 MiB · 7 third-party 6.3 MiB over 1MB target
Media 95% · 6.9 MiB
Image 2% · 118.2 KiB
JavaScript 1% · 102.8 KiB
Font 1% · 96.8 KiB
CSS 1% · 71.4 KiB
Document 0% · 20.0 KiB
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 21 resources | 7.3 MiB | ||||||
BJS Execution Cost837ms total JS executionREVIEW
JS Execution Cost
837ms total JS execution
837ms total JS execution
Warning::
https://a16z.com/wp-content/themes/a16z/assets/com...: 318ms CPU time
Info::
https://a16z.com/: 197ms CPU time
Info::
Unattributable: 134ms CPU time
Info::
https://a16z.com/wp-content/themes/a16z/assets/com...: 121ms CPU time
Info::
https://a16z.com/wp-content/themes/a16z/assets/com...: 68ms CPU time
Info::
Third-party scripts: 134ms (16% of total)
Main Thread Breakdown
Other 38% Script Evaluation 36% Style & Layout 14% Rendering 8%
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://a16z.com/wp-content/themes/a16z/assets/compiled/vite/js/vite-homepage.js | 318ms | 204ms | 0ms | 1st |
| https://a16z.com/ | 197ms | 11ms | 1ms | 1st |
| Unattributable | 134ms | 10ms | 0ms | 3rd |
| https://a16z.com/wp-content/themes/a16z/assets/compiled/vite/js/vite-index.js | 121ms | 9ms | 0ms | 1st |
| https://a16z.com/wp-content/themes/a16z/assets/compiled/vite/js/vite-core.js | 68ms | 64ms | 0ms | 1st |
CGreen HostingActionWhether the site is served from green-energy infrastructureREVIEW
Green Hosting
ActionWhether the site is served from green-energy infrastructure
Green Hosting
No green hosting detected
BHTTP Cachingpublic,max-age=0,must-revalidateREVIEW
HTTP Caching
public,max-age=0,must-revalidate
public,max-age=0,must-revalidate
Info::
Cache-Control header is set
Got: public,max-age=0,must-revalidate
Info::
ETag present — enables conditional (304) responses
Cache-Control
public,max-age=0,must-revalidate
| Directive | Value | Meaning |
|---|---|---|
| public | — | Any cache may store this response |
| max-age | 0 | Cache for 0 seconds |
| must-revalidate | — | Must recheck with server after expiry |
A+Text CompressionAll text resources are compressedPASS
Text Compression
All text resources are compressed
All text resources are compressed
Info::
All text resources are compressed
All text resources are properly compressed.
A+Image Optimization1 images, 0 KB saveablePASS
Image Optimization
1 images, 0 KB saveable
1 images, 0 KB saveable
Info::
All images are well-optimized
1 images 117 KB
0 oversized -0 KB
1 legacy format
0 missing dimensions CLS risk
A+Font Loading3 fonts (97 KB)PASS
Font Loading
3 fonts (97 KB)
3 fonts (97 KB)
Info::
3 font(s) use font-display: swap (FOUT risk but functional)
Web fonts
3
97 KB total
Render-blocking
0
of 3
Dominant font-display
swap
Most common across fonts
Font loading timeline
Transfer FOIT (block) FOUT (swap)
vite-DomaineText-Light.... woff2 swap
Size 40 KB
Load time 125 ms
Start 583 ms
Risk FOUT — text flashes from fallback to web font
vite-icomoon.ttf ttf swap
Size 18 KB
Load time 181 ms
Start 584 ms
Risk FOUT — text flashes from fallback to web font
- Convert to woff2 for ~30% smaller file size
vite-DomaineSansText-Li... woff2 swap
Size 39 KB
Load time 142 ms
Start 585 ms
Risk FOUT — text flashes from fallback to web font
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 ~5 KB and ~10 ms
A+JS Bundles10 scripts, 0 KB unusedPASS
JS Bundles
10 scripts, 0 KB unused
10 scripts, 0 KB unused
0 KB unused JavaScript
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://a16z.com/wp-content/themes/a16z/assets/compiled/vite/js/vite-core.js | 25 KB | — | ✓ | 1st |
| https://a16z.com/wp-content/themes/a16z/assets/compiled/vite/js/vite-index.js | 26 KB | — | ✓ | 1st |
| https://a16z.com/wp-content/themes/a16z/assets/compiled/vite/js/vite-CoreSizes.js | 1 KB | — | ✓ | 1st |
| https://plausible.io/js/script.manual.js | 2 KB | — | ✓ | 3rd |
| https://a16z.com/wp-content/themes/a16z/assets/compiled/vite/js/vite-mainLayout.js | 2 KB | — | ✓ | 1st |
| blob:https://a16z.com/dc3710eb-a319-472a-a62f-97352b4695c7 | -0 KB | — | ✓ | 3rd |
| https://cdn.jsdelivr.net/npm/algoliasearch@4/dist/algoliasearch-lite.umd.js | 5 KB | — | ✓ | 3rd |
| https://a16z.com/wp-includes/js/wp-emoji-release.min.js?ver=6.9.4 | 6 KB | — | ✓ | 1st |
| https://a16z.com/wp-content/themes/a16z/assets/compiled/vite/js/vite-Headless.js | 7 KB | — | ✓ | 1st |
| https://a16z.com/wp-content/themes/a16z/assets/compiled/vite/js/vite-homepage.js | 28 KB | — | ✓ | 1st |
A+Resource CachingAll resources properly cachedPASS
Resource Caching
All resources properly cached
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+Critical Rendering PathNo render-blocking resourcesPASS
Critical Rendering Path
No render-blocking resources
No render-blocking resources
Info::
No render-blocking resources detected
A+Resource HintsNo optimization neededPASS
Resource Hints
No optimization needed
No optimization needed
Info::
No resource hint issues
Network Waterfall21 requests over 1132msINFO
Network Waterfall
21 requests over 1132ms
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
16% of JavaScript execution is third-party
First-party Third-party 134ms · 0KB · €1/mo
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
Unattributable Unattributable | Other | 134ms | 0 KB | — | €1/mo | Optional |
Unattributable
Other
Execution 134ms
Transfer 0 KB
Monthly Cost €1/mo
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.