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https://www.loom.com

Performance

· 16 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
72
GRADE
C
FIX
4
REVIEW
3
PASS
7
INFO
2

Performance-focused optimization plan with CWV assessment, top offenders, and time estimates

Mobile Desktop
16
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
88
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
81
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
92
SEO Measures basic SEO optimizations: meta tags, crawlability, link text, and mobile friendliness.

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

5.71 s

Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.

13.22 s

Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.

2.19 s

Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.

0.237

Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.

11.05 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.

27.75 s

Page Load Progression

639 ms
1.3 s
1.9 s
2.6 s
3.2 s
3.8 s
4.5 s
5.1 s
Checks
16
7 PASS 3 REVIEW 4 FIX
F
Page Weight Budget
Action
5.6 MB transferred, 160 requests
FIX
5.6 MB transferred, 160 requests
Critical::
Page weighs 14.8 MB (5.6 MB transferred)
Warning::
JavaScript is 3.1 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 3.1 MB
Warning::
160 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 1.2 g CO2 per page load
5.6 MB / 2.4 MB budget
5.6 MB transferred
160 requests
1.2 g CO2 per page load
JavaScript 3.1 MiB 56%
Other 1.7 MiB 30%
Images 440.1 KiB 8%
Fonts 174.4 KiB 3%
CSS 93.3 KiB 2%
HTML 47.3 KiB 1%
Other 37.7 KiB 1%
Other 15.3 KiB 0%
Other 3.2 KiB 0%
Other 0 B 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Over budget

Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.

Why this matters

JavaScript bundle is large — code-split routes and lazy-load off-screen components to defer.

Source: web.dev

Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.

Why this matters

High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.

Source: web.dev

D
Third-Party Impact
Action
89% third-party, 0 ms blocking
FIX
89% third-party, 0 ms blocking
Warning::
Third-party code accounts for 89% of page weight (5.0 MiB of 5.6 MiB)
Info::
Third-party blocking time is low (0 ms)
89%
First-party Third-party
F
JS Execution Cost
Action
10302ms total JS execution
FIX
10302ms total JS execution
Warning::
https://cdn.loom.com/assets/js/embed-video-8f4922e...: 2153ms CPU time
Warning::
https://cdn.loom.com/assets/js/vendor-40-6abb717ab...: 1735ms CPU time
Warning::
https://www.loom.com/: 1486ms CPU time
Warning::
https://cdn.loom.com/assets/js/vendor-42-d0df3fb71...: 1205ms CPU time
Warning::
Unattributable: 1124ms CPU time
Warning::
Third-party scripts: 7280ms (71% of total)

Main Thread Breakdown

Script Evaluation 49% Other 19% Style & Layout 12% Script Parsing & Compilation 11% Rendering 6%
ScriptTotalScriptingParse/CompileParty
https://cdn.loom.com/assets/js/embed-video-8f4922ebfad0a2f0.js2153ms1841ms261ms3rd
https://cdn.loom.com/assets/js/vendor-40-6abb717ab3231a67.js1735ms1564ms7ms3rd
https://www.loom.com/1486ms28ms3ms1st
https://cdn.loom.com/assets/js/vendor-42-d0df3fb71ad4abfd.js1205ms98ms12ms3rd
Unattributable1124ms118ms0ms3rd
https://www.loom.com/_next/static/chunks/framework-94bcf14506ace93a.js857ms607ms16ms1st
https://www.loom.com/_next/static/chunks/pages/_app-67a2568e1fd2dd38.js375ms210ms101ms1st
https://cdn.loom.com/assets/js/vendor-36-c035baa3c8715172.js342ms313ms19ms3rd
https://cdn.loom.com/assets/js/vendor-41-b27b1cc1f2cf4533.js313ms213ms12ms3rd
https://cdn.loom.com/assets/js/vendor-11-9ada392e35cefcce.js149ms85ms45ms3rd

Showing top 10 of 17 scripts

F
JS Bundles
Action
79 scripts, 1.5 MB unused
FIX
79 scripts, 1.5 MB unused
Warning::
https://cdn.loom.com/assets/js/embed-video-8f4922e...: 334 KB unused (45%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdn.loom.com/assets/js/vendor-518a401a-31c...: 157 KB unused (88%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.loom.com/_next/static/chunks/pages/_ap...: 148 KB unused (65%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdn.loom.com/assets/js/vendor-1-24b8eadc1c...: 58 KB unused (100%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdn.loom.com/assets/js/vendor-39-358b691d0...: 54 KB unused (94%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 1.5 MB
1506 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://cdn.loom.com/assets/js/embed-video-8f4922ebfad0a2f0.js745 KB334 KB (45%)✓3rd
https://cdn.loom.com/assets/js/vendor-518a401a-31c9c6e7b244dacd.js178 KB157 KB (88%)✓3rd
https://www.loom.com/_next/static/chunks/pages/_app-67a2568e1fd2dd38.js229 KB148 KB (65%)✓1st
https://cdn.loom.com/assets/js/vendor-1-24b8eadc1c473dfb.js59 KB58 KB (100%)✓3rd
https://cdn.loom.com/assets/js/vendor-39-358b691d007642eb.js58 KB54 KB (94%)✓3rd
https://cdn.loom.com/assets/js/vendor-26-3a9300c9ffbe37d4.js53 KB52 KB (99%)✓3rd
https://cdn.loom.com/assets/js/vendor-15-dde030cc82ef5af8.js49 KB44 KB (92%)✓3rd
https://cdn.loom.com/assets/js/vendor-41-b27b1cc1f2cf4533.js54 KB42 KB (79%)✓3rd
https://cdn.loom.com/assets/js/vendor-36-c035baa3c8715172.js69 KB42 KB (62%)✓3rd
https://cdn.loom.com/assets/js/vendor-35-dfffd377479ad1e6.js46 KB41 KB (90%)✓3rd

Consider code splitting or tree shaking to reduce unused code.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

B
Image Optimization
30 images, 0 KB saveable
REVIEW
30 images, 0 KB saveable
Info::
All images are well-optimized
30 images 440 KB
0 oversized -0 KB
29 legacy format
0 missing dimensions CLS risk
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

B
HTTP Caching
public, max-age=0, must-revalidate
REVIEW
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

DirectiveValueMeaning
public—Any cache may store this response
max-age0Cache for 0 seconds
must-revalidate—Must recheck with server after expiry
A+
Text Compression
All text resources are compressed
PASS
All text resources are compressed
Info::
All text resources are compressed
All text resources are properly compressed.
A+
Font Loading
5 fonts (174 KB)
PASS
5 fonts (174 KB)
Info::
5 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

5

174 KB total

Render-blocking

0

of 5

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s FCP 5.7 s LCP 13.2 shttps://cdn.loom.com/assets/marketing/fonts/Charlie_Display-Bold.woff2Charlie_Display-Bold.woff2 https://cdn.loom.com/assets/marketing/fonts/Charlie_Display-Bold.woff2 — 27.2 KiB — 0 ms — font-display: swaphttps://cdn.loom.com/assets/marketing/fonts/Charlie_Text-Regular.woff2Charlie_Text-Regular.woff2 https://cdn.loom.com/assets/marketing/fonts/Charlie_Text-Regular.woff2 — 25.3 KiB — 0 ms — font-display: swaphttps://cdn.loom.com/assets/marketing/fonts/Charlie_Text-Bold.woff2Charlie_Text-Bold.woff2 https://cdn.loom.com/assets/marketing/fonts/Charlie_Text-Bold.woff2 — 26.3 KiB — 0 ms — font-display: swaphttps://cdn.loom.com/assets/marketing/fonts/Charlie_Text-Semibold.woff2Charlie_Text-Semibold.w... https://cdn.loom.com/assets/marketing/fonts/Charlie_Text-Semibold.woff2 — 25.7 KiB — 0 ms — font-display: swaphttps://ds-cdn.prod-east.frontend.public.atl-paas.net/assets/fonts/atlassian-sans/v3/AtlassianSans-latin.woff2AtlassianSans-latin.woff2 https://ds-cdn.prod-east.frontend.public.atl-paas.net/assets/fonts/atlassian-sans/v3/AtlassianSans-latin.woff2 — 70.0 KiB — 0 ms — font-display: swap
Charlie_Display-Bold.woff2 woff2 swap
Size 27 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
Charlie_Text-Regular.woff2 woff2 swap
Size 25 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
Charlie_Text-Bold.woff2 woff2 swap
Size 26 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
Charlie_Text-Semibold.w... woff2 swap
Size 26 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
AtlassianSans-latin.woff2 woff2 swap
Size 70 KB
Load time 0 ms
Start 0 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)
A+
Resource Caching
All resources properly cached
PASS
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+
Critical Rendering Path
No render-blocking resources
PASS
No render-blocking resources
Info::
No render-blocking resources detected
A+
Resource Hints
10 hints, 0 missing preconnects
PASS
10 hints, 0 missing preconnects
Info::
Page uses 10 resource hint(s)

Current Resource Hints

preconnect
7
preload
3
dns-prefetch
—
prefetch
—

10 resource hints configured

A+
Render-Blocking Resources
No render-blocking resources detected
PASS
No render-blocking resources detected
Info::
No render-blocking resources detected in <head>
A+
Third-Party Resources
No third-party resources detected
PASS
No third-party resources detected
Network Waterfall
160 requests over 0ms
INFO

Performance analysis not available for this result.

Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
71% of JavaScript execution is third-party
First-party Third-party 7280ms · 1264KB · €79/mo
cdn.loom.com
Other
Costly
Execution 2153ms
Transfer 745 KB
Unused 45%
Monthly Cost €23/mo
cdn.loom.com
Other
Costly
Execution 1735ms
Transfer 24 KB
Monthly Cost €19/mo
cdn.loom.com
Other
Costly
Execution 1205ms
Transfer 47 KB
Monthly Cost €13/mo
Unattributable
Other
Costly
Execution 1124ms
Transfer 0 KB
Monthly Cost €12/mo
cdn.loom.com
Other
Costly
Execution 342ms
Transfer 69 KB
Unused 62%
Monthly Cost €4/mo
cdn.loom.com
Other
Costly
Execution 313ms
Transfer 54 KB
Unused 79%
Monthly Cost €3/mo
cdn.loom.com
Other
Optional
Execution 149ms
Transfer 37 KB
Monthly Cost €2/mo
cdn.loom.com
Other
Optional
Execution 83ms
Transfer 18 KB
Monthly Cost €1/mo
atl-onetrust-wrapper.atlassian.com
Other
Optional
Execution 60ms
Transfer 32 KB
Monthly Cost €1/mo
cdn.loom.com
Other
Optional
Execution 58ms
Transfer 178 KB
Unused 88%
Monthly Cost €1/mo
cdn.loom.com
Other
Optional
Execution 57ms
Transfer 59 KB
Unused 100%
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • cdn.loom.com adds 2153ms and costs ~€23/month
  • cdn.loom.com adds 1735ms and costs ~€19/month
  • cdn.loom.com adds 1205ms and costs ~€13/month
  • Unattributable adds 1124ms and costs ~€12/month
  • cdn.loom.com adds 342ms and costs ~€4/month
  • cdn.loom.com adds 313ms and costs ~€3/month

71% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.

Why this matters

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.loom.com takes 2153ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

cdn.loom.com takes 1735ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

cdn.loom.com takes 1205ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

Unattributable takes 1124ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

cdn.loom.com takes 342ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

62% of cdn.loom.com's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

cdn.loom.com takes 313ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

79% of cdn.loom.com's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

88% of cdn.loom.com's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

100% of cdn.loom.com's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

How third-party costs are calculated

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

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