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.
6.03 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
8.59 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
275 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.020
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
6.03 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.
9.08 s
Page Load Progression
999 ms 2.0 s 3.0 s
4.0 s
5.0 s
6.0 s
7.0 s
8.0 sFPage Weight BudgetAction9.2 MB transferred, 170 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
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
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
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
FJS BundlesAction15 scripts, 2.9 MB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://sf16-sg.larksuitecdn.com/obj/suite-public-file-sg/hera_tmp/hera/comp.a3dc50fafdb56593f3e943ffa.js | 3319 KB | 2291 KB (69%) | ✓ | 3rd |
| https://sf16-sg.larksuitecdn.com/obj/suite-public-file-sg/open_file/resources/hera-static/js/index.59d01f39e002c74fc6724715629b60b642efcfb7338c573ea2bf10117d8bd877.js | 310 KB | 150 KB (49%) | ✓ | 3rd |
| https://js.intercomcdn.com/frame-modern.db2b74ec.js | 193 KB | 123 KB (64%) | ✓ | 3rd |
| https://lf-package-sg.larksuitecdn.com/obj/lark-static-sgsaas/lark/passport/tenant/tenant-widget-6.1.2-1.0.0.143.js | 202 KB | 119 KB (60%) | ✓ | 3rd |
| https://js.intercomcdn.com/vendor-modern.80eace52.js | 144 KB | 86 KB (60%) | ✓ | 3rd |
| https://lf-package-sg.larksuitecdn.com/obj/lark-static-sgsaas/lark/iam/passport-js-apis-plugin-google-2.1.3.js | 114 KB | 84 KB (74%) | ✓ | 3rd |
| https://accounts.google.com/gsi/client | 96 KB | 72 KB (75%) | ✓ | 3rd |
| https://sf16-sg.larksuitecdn.com/obj/suite-public-file-sg/vendor/vendor.6b3fe94d8606.js | 68 KB | 30 KB (45%) | ✓ | 3rd |
| https://lf-package-sg.larksuitecdn.com/obj/lark-static-sgsaas/lark/iam/passport-js-apis-2.2.1-1.0.0.78.js | 21 KB | — | ✓ | 3rd |
| https://sf16-short-sg.bytedapm.com/slardar/fe/sdk-web/browser.sg.js?bid=larksuite_browser&globalName=Slardar | 17 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
FPage Weight InventoryAction170 resources · 9.2 MB · 2.9 MB savings availableFIX
~2.9 MiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 170 resources | 9.2 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
CImage OptimizationAction117 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
CJS Execution CostAction1947ms total JS executionREVIEW
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://sf16-sg.larksuitecdn.com/obj/suite-public-file-sg/hera_tmp/hera/comp.a3dc50fafdb56593f3e943ffa.js | 529ms | 245ms | 257ms | 3rd |
| https://js.intercomcdn.com/frame-modern.db2b74ec.js | 349ms | 285ms | 11ms | 3rd |
| /index.59d01f39e002c74fc6724715629b60b642efcfb7338c573ea2bf10117d8bd877.js | 313ms | 29ms | 0ms | 3rd |
| Unattributable | 283ms | 6ms | 0ms | 3rd |
| https://sf16-sg.larksuitecdn.com/obj/suite-public-file-sg/open_file/resources/hera-static/js/index.59d01f39e002c74fc6724715629b60b642efcfb7338c573ea2bf10117d8bd877.js | 247ms | 138ms | 30ms | 3rd |
| https://www.larksuite.com/en_sg/?from_site=feishu | 162ms | 43ms | 6ms | 3rd |
| https://sf16-sg.larksuitecdn.com/obj/suite-public-file-sg/vendor/vendor.6b3fe94d8606.js | 64ms | 17ms | 4ms | 3rd |
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 (424 KB)PASS
Web fonts
4
424 KB total
Render-blocking
0
of 4
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
- 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
- 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
- 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
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 ~339 KB and ~678 ms
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource HintsNo optimization neededPASS
Network Waterfall170 requests over 5689msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
sf16-sg.larksuitecdn.com sf16-sg.larksuitecdn.com | Other | 529ms | 3319 KB | 69% | ¥71/mo | Costly |
js.intercomcdn.com js.intercomcdn.com | Other | 349ms | 193 KB | 64% | ¥47/mo | Costly |
/index.59d01f39e002c74fc6724715629b60b642efcfb7338c573ea2bf10117d8bd877.js /index.59d01f39e002c74fc6724715629b60b642efcfb7338c573ea2bf10117d8bd877.js | Other | 313ms | 0 KB | — | ¥42/mo | Costly |
Unattributable Unattributable | Other | 283ms | 0 KB | — | ¥38/mo | Costly |
sf16-sg.larksuitecdn.com sf16-sg.larksuitecdn.com | Other | 247ms | 310 KB | 49% | ¥33/mo | Costly |
www.larksuite.com www.larksuite.com | Other | 162ms | 63 KB | — | ¥22/mo | Optional |
sf16-sg.larksuitecdn.com sf16-sg.larksuitecdn.com | Other | 64ms | 68 KB | 45% | ¥9/mo | Optional |
These scripts may cost more than they're worth
- sf16-sg.larksuitecdn.com adds 529ms and costs ~¥71/month
- js.intercomcdn.com adds 349ms and costs ~¥47/month
- /index.59d01f39e002c74fc6724715629b60b642efcfb7338c573ea2bf10117d8bd877.js adds 313ms and costs ~¥42/month
- Unattributable adds 283ms and costs ~¥38/month
- sf16-sg.larksuitecdn.com adds 247ms and costs ~¥33/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
sf16-sg.larksuitecdn.com takes 529ms 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
69% of sf16-sg.larksuitecdn.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
js.intercomcdn.com takes 349ms 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
64% of js.intercomcdn.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
/index.59d01f39e002c74fc6724715629b60b642efcfb7338c573ea2bf10117d8bd877.js takes 313ms 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 283ms 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
sf16-sg.larksuitecdn.com takes 247ms 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