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https://www.loom.com

Performance

· 14 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
72
GRADE
C
FIX
4
REVIEW
3
PASS
5
INFO
2

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

Mobile Desktop
61
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
91
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
77
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.

668 ms

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

2.01 s

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

456 ms

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

0.051

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

3.79 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.

5.74 s

Page Load Progression

710 ms
1.4 s
2.1 s
2.8 s
3.6 s
4.3 s
5.0 s
5.7 s
Checks
14
5 PASS 3 REVIEW 4 FIX
F
Page Weight Budget
Action
5.8 MB transferred, 177 requests
FIX
5.8 MB transferred, 177 requests
Critical::
Page weighs 14.9 MB (5.8 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::
177 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
5.8 MB / 2.4 MB budget
5.8 MB transferred
177 requests
1.2 g CO2 per page load
JavaScript 3.1 MiB 54%
Other 1.9 MiB 32%
Images 440.1 KiB 7%
Fonts 174.4 KiB 3%
CSS 92.9 KiB 2%
Other 48.6 KiB 1%
HTML 47.0 KiB 1%
Other 21.8 KiB 0%
Other 9.7 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 (5.2 MiB of 5.8 MiB)
Info::
Third-party blocking time is low (0 ms)
89%
First-party Third-party
D
JS Execution Cost
Action
3183ms total JS execution
FIX
3183ms total JS execution
Warning::
https://cdn.loom.com/assets/js/vendor-40-6abb717ab...: 760ms CPU time
Warning::
https://cdn.loom.com/assets/js/embed-video-8f4922e...: 566ms CPU time
Warning::
https://www.loom.com/: 460ms CPU time
Warning::
Unattributable: 330ms CPU time
Warning::
https://cdn.loom.com/assets/js/vendor-42-d0df3fb71...: 279ms CPU time
Warning::
Third-party scripts: 2227ms (70% of total)

Main Thread Breakdown

Script Evaluation 52% Other 19% Style & Layout 14% Script Parsing & Compilation 9% Rendering 4%
ScriptTotalScriptingParse/CompileParty
https://cdn.loom.com/assets/js/vendor-40-6abb717ab3231a67.js760ms638ms3ms3rd
https://cdn.loom.com/assets/js/embed-video-8f4922ebfad0a2f0.js566ms480ms73ms3rd
https://www.loom.com/460ms8ms1ms1st
Unattributable330ms32ms0ms3rd
https://cdn.loom.com/assets/js/vendor-42-d0df3fb71ad4abfd.js279ms29ms3ms3rd
https://www.loom.com/_next/static/chunks/framework-94bcf14506ace93a.js267ms222ms6ms1st
https://cdn.loom.com/assets/js/vendor-41-b27b1cc1f2cf4533.js161ms92ms4ms3rd
https://cdn.loom.com/assets/js/vendor-36-c035baa3c8715172.js131ms119ms5ms3rd
https://www.loom.com/embed/09b1aa507cb846138847bf8e98b56a71?hide_owner=true&hide_share=true&hide_title=true&hideEmbedTopBar=true&default_speed=true&skip_embed_eovn=true&t=0&disable_analytics=true119ms1ms1ms1st
https://www.loom.com/_next/static/chunks/pages/_app-67a2568e1fd2dd38.js110ms64ms27ms1st
F
JS Bundles
Action
81 scripts, 1.5 MB unused
FIX
81 scripts, 1.5 MB unused
Warning::
https://cdn.loom.com/assets/js/embed-video-8f4922e...: 324 KB unused (44%)
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...: 53 KB unused (93%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 1.5 MB
1493 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://cdn.loom.com/assets/js/embed-video-8f4922ebfad0a2f0.js745 KB324 KB (44%)✓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 KB53 KB (93%)✓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 KB41 KB (61%)✓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
31 images, 0 KB saveable
REVIEW
31 images, 0 KB saveable
Info::
All images are well-optimized
31 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 500 ms 1.0 s 1.5 s 2.0 s FCP 668 ms LCP 2.0 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 — 26.2 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
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
Network Waterfall
177 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
70% of JavaScript execution is third-party
First-party Third-party 2227ms · 939KB · €24/mo
cdn.loom.com
Other
Costly
Execution 760ms
Transfer 24 KB
Monthly Cost €8/mo
cdn.loom.com
Other
Costly
Execution 566ms
Transfer 745 KB
Unused 44%
Monthly Cost €6/mo
Unattributable
Other
Costly
Execution 330ms
Transfer 0 KB
Monthly Cost €4/mo
cdn.loom.com
Other
Costly
Execution 279ms
Transfer 47 KB
Monthly Cost €3/mo
cdn.loom.com
Other
Optional
Execution 161ms
Transfer 54 KB
Unused 79%
Monthly Cost €2/mo
cdn.loom.com
Other
Optional
Execution 131ms
Transfer 69 KB
Unused 61%
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • cdn.loom.com adds 760ms and costs ~€8/month
  • cdn.loom.com adds 566ms and costs ~€6/month
  • Unattributable adds 330ms and costs ~€4/month
  • cdn.loom.com adds 279ms and costs ~€3/month

70% of JavaScript execution time comes from third-party scripts.

Why this matters

Third-party scripts (analytics, ads, social, A/B testing) often dominate execution time — every one is a perf-and-privacy tax.

Learn more ▾

Each third-party script is a black box: you don't control when it loads, what it executes, or how much it grows. They often account for a major share of total blocking time on average sites (HTTP Archive's Web Almanac documents the trend). Audit which ones you actually need, defer the rest, and use facade patterns (lite-youtube, lite-vimeo) for embedded media.

Source: web.dev / HTTP Archive Web Almanac

cdn.loom.com takes 760ms 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 566ms 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 330ms 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 279ms 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

61% 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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