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https://genially.com

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
72
GRADE
C
FIX
5
REVIEW
3
PASS
7
INFO
2

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

Mobile Desktop
54
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.
92
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.

2.01 s

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

6.65 s

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

856 ms

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

0.056

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

3.12 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.

12.93 s

Page Load Progression

1.1 s
2.2 s
3.3 s
4.4 s
5.5 s
6.6 s
7.7 s
8.8 s
Checks
17
7 PASS 3 REVIEW 5 FIX
F
Page Weight Budget
Action
12.0 MB transferred, 55 requests
FIX
12.0 MB transferred, 55 requests
Critical::
Page weighs 19.3 MB (12.0 MB transferred)
Warning::
Images are 1.2 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.2 MB
Warning::
JavaScript is 914 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 914 KB
Info::
Fonts are 234 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 234 KB
Info::
55 HTTP requests
Info::
Estimated 2.5 g CO2 per page load
12.0 MB / 2.4 MB budget
12.0 MB transferred
55 requests
2.5 g CO2 per page load
Other 9.4 MiB 78%
Images 1.2 MiB 10%
JavaScript 914.5 KiB 7%
Fonts 234.3 KiB 2%
Other 189.5 KiB 2%
Other 65.8 KiB 1%
HTML 52.6 KiB 0%
Other 2.1 KiB 0%
Other 1.6 KiB 0%
CSS 665 B 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Over budget

Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.

Why this matters

Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.

Source: web.dev

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

Subset fonts to include only used characters, or switch to system font stacks.

Why this matters

Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).

Source: web.dev font loading

D
Third-Party Impact
Action
91% third-party, 0 ms blocking
FIX
91% third-party, 0 ms blocking
Warning::
Third-party code accounts for 91% of page weight (10.9 MiB of 12.0 MiB)
Info::
Third-party blocking time is low (0 ms)
91%
First-party Third-party
F
JS Execution Cost
Action
16723ms total JS execution
FIX
16723ms total JS execution
Warning::
https://genially.com/: 13192ms CPU time
Warning::
Unattributable: 982ms CPU time
Warning::
https://genially.com/webpack-runtime-65d6b087e0ac7...: 901ms CPU time
Warning::
https://genially.com/framework-2acfb2c37040f9cb497...: 814ms CPU time
Warning::
https://genially.com/commons-0d740868230f771f0307....: 367ms CPU time
Info::
Third-party scripts: 1386ms (8% of total)

Main Thread Breakdown

Other 40% Style & Layout 35% Script Evaluation 12% Rendering 9% Script Parsing & Compilation 3%
ScriptTotalScriptingParse/CompileParty
https://genially.com/13192ms557ms55ms1st
Unattributable982ms7ms0ms3rd
https://genially.com/webpack-runtime-65d6b087e0ac70b9266a.js901ms828ms1ms1st
https://genially.com/framework-2acfb2c37040f9cb4971.js814ms287ms8ms1st
https://genially.com/commons-0d740868230f771f0307.js367ms1ms366ms1st
https://dev.visualwebsiteoptimizer.com/dcdn/settings.js?a=651973&settings_type=4&ts=1776790939&dt=mobile&cc=ES176ms172ms2ms3rd
https://accounts.google.com/gsi/client117ms88ms18ms3rd
https://cdn.lr-in-prod.com/logger-1.min.js111ms51ms59ms3rd
https://genially.com/c0ce423b-966e873107eccc909d3d.js63ms3ms59ms1st
D
Page Weight Inventory
Action
55 resources · 12.0 MB · 205 KB savings available
FIX
55 resources · 12.0 MB · 205 KB savings available
Warning::
Page weight 11.0 MB over 1MB target
Got: 12.0 MB Expected: ≤ 1 MB
Info::
~205 KB of savings available
Warning::
38 third-party resources (91% of weight)
Info::
7 resources over 200KB
55 resources · 12.0 MiB · 38 third-party 11.0 MiB over 1MB target
Media 78% · 9.4 MiB
Image 12% · 1.4 MiB
JavaScript 8% · 980.2 KiB
Font 2% · 234.3 KiB
Document 0% · 52.6 KiB
Other 0% · 30.3 KiB
CSS 0% · 665 B

~204.7 KiB of savings available

Remove unused JavaScript: 204.7 KiB
D
HTTP Caching
Action
No cache headers
FIX
No cache headers
Warning::
No Cache-Control header found
Browsers will use heuristic caching, which can be unpredictable. Set explicit cache headers.
Info::
ETag present — enables conditional (304) responses
Info::
Last-Modified header present

No Cache-Control header

Adding a Cache-Control header can significantly improve repeat-visit performance.

B
Image Optimization
21 images, 0 KB saveable
REVIEW
21 images, 0 KB saveable
Info::
All images are well-optimized
21 images 1.2 MB
0 oversized -0 KB
21 legacy format
0 missing dimensions CLS risk
C
JS Bundles
Action
14 scripts, 205 KB unused
REVIEW
14 scripts, 205 KB unused
Warning::
https://genially.com/c0ce423b-966e873107eccc909d3d...: 73 KB unused (37%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://accounts.google.com/gsi/client: 68 KB unused (71%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdn.lr-in-prod.com/logger-1.min.js: 43 KB unused (35%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://genially.com/app-db86b8697d52274a33f0.js: 20 KB unused (46%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 205 KB
205 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://genially.com/c0ce423b-966e873107eccc909d3d.js202 KB73 KB (37%)✓1st
https://accounts.google.com/gsi/client96 KB68 KB (71%)✓3rd
https://cdn.lr-in-prod.com/logger-1.min.js124 KB43 KB (35%)✓3rd
https://genially.com/app-db86b8697d52274a33f0.js45 KB20 KB (46%)✓1st
https://genially.com/component---src-views-home-home-tsx-899e46ce8244d47fa124.js2 KB—✓1st
https://genially.com/commons-0d740868230f771f0307.js378 KB—✓1st
https://cdn.cookielaw.org/scripttemplates/otSDKStub.js0 KB—✓3rd
https://dev.visualwebsiteoptimizer.com/j.php?a=651973&u=https%3A%2F%2Fgenially.com%2F&vn=2.1&x=true9 KB—✓3rd
https://genially.com/framework-2acfb2c37040f9cb4971.js43 KB—✓1st
https://dev.visualwebsiteoptimizer.com/cdn/web/djIkdGU6Ny4wOmFzeW5jJWdxdWVyeSVzYWZhcmk=/tag-9493ceffe2b22ae668637ac4efbd8e58br.js57 KB—✓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

C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

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
3 fonts (234 KB)
PASS
3 fonts (234 KB)
Info::
3 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

3

234 KB total

Render-blocking

0

of 3

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s FCP 2.0 s LCP 6.6 shttps://genially.com/static/DMSans_18pt-Regular-2c8600ab0e9535150736363f56e38544.ttfDMSans_18pt-Regular-2c8... https://genially.com/static/DMSans_18pt-Regular-2c8600ab0e9535150736363f56e38544.ttf — 30.2 KiB — 99 ms — font-display: swaphttps://genially.com/static/Unbounded-Bold-0c54d6e100bb5ec11f3ad42c0c47d1c7.ttfUnbounded-Bold-0c54d6e1... https://genially.com/static/Unbounded-Bold-0c54d6e100bb5ec11f3ad42c0c47d1c7.ttf — 173.6 KiB — 95 ms — font-display: swaphttps://genially.com/static/DMSans_18pt-SemiBold-bcf0d60e4c3d097c493a4e34b9b40577.ttfDMSans_18pt-SemiBold-bc... https://genially.com/static/DMSans_18pt-SemiBold-bcf0d60e4c3d097c493a4e34b9b40577.ttf — 30.5 KiB — 87 ms — font-display: swap
DMSans_18pt-Regular-2c8... ttf swap
Size 30 KB
Load time 99 ms
Start 180 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
Unbounded-Bold-0c54d6e1... ttf swap
Size 174 KB
Load time 95 ms
Start 181 ms
Risk FOUT — text flashes from fallback to web font
  • 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
DMSans_18pt-SemiBold-bc... ttf swap
Size 30 KB
Load time 87 ms
Start 181 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
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 ~157 KB and ~314 ms

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
8 hints, 0 missing preconnects
PASS
8 hints, 0 missing preconnects
Info::
Page uses 8 resource hint(s)

Current Resource Hints

preconnect
—
preload
8
dns-prefetch
—
prefetch
—

8 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
55 requests over 1498ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s FCP 2.0 s LCP 6.6 shttps://genially.com// https://genially.com/ — 200 — 52.6 KiB — 91 ms — h2https://cdn.cookielaw.org/scripttemplates/otSDKStub.jscdn.cookielaw.org/scripttemplates/o... https://cdn.cookielaw.org/scripttemplates/otSDKStub.js — -1 — 0 B — 75 ms — https://genially.com/webpack-runtime-65d6b087e0ac70b9266a.js/webpack-runtime-65d6b087e0ac70b926... https://genially.com/webpack-runtime-65d6b087e0ac70b9266a.js — 200 — 3.4 KiB — 158 ms — h2https://genially.com/framework-2acfb2c37040f9cb4971.js/framework-2acfb2c37040f9cb4971.js https://genially.com/framework-2acfb2c37040f9cb4971.js — 200 — 43.0 KiB — 130 ms — h2https://genially.com/app-db86b8697d52274a33f0.js/app-db86b8697d52274a33f0.js https://genially.com/app-db86b8697d52274a33f0.js — 200 — 44.6 KiB — 216 ms — h2https://genially.com/c0ce423b-966e873107eccc909d3d.js/c0ce423b-966e873107eccc909d3d.js https://genially.com/c0ce423b-966e873107eccc909d3d.js — 200 — 201.8 KiB — 134 ms — h2https://genially.com/commons-0d740868230f771f0307.js/commons-0d740868230f771f0307.js https://genially.com/commons-0d740868230f771f0307.js — 200 — 377.6 KiB — 283 ms — h2https://genially.com/component---src-views-home-home-tsx-899e46ce8244d47fa124.js/component---src-views-home-home-ts... https://genially.com/component---src-views-home-home-tsx-899e46ce8244d47fa124.js — 200 — 1.8 KiB — 71 ms — h2https://genially.com/page-data/index/page-data.json/page-data/index/page-data.json https://genially.com/page-data/index/page-data.json — 200 — 24.1 KiB — 193 ms — h2https://genially.com/page-data/app-data.json/page-data/app-data.json https://genially.com/page-data/app-data.json — 200 — 1.3 KiB — 204 ms — h2https://assets.genially.com/s3fs-public/2025-07/Mobile_Topbar_Templates_0.png?VersionId=qSMhkHhLCRno1tkd1LoijC4RapX2OrTUassets.genially.com/s3fs-public/202... https://assets.genially.com/s3fs-public/2025-07/Mobile_Topbar_Templates_0.png?VersionId=qSMhkHhLCRno1tkd1LoijC4RapX2OrTU — 200 — 37.9 KiB — 126 ms — h2https://assets.genially.com/s3fs-public/2025-09/Mobile_Topbar_Plans.png?VersionId=myEI1OnsdLYkuJS6_UhzofcGvr_MtZ.tassets.genially.com/s3fs-public/202... https://assets.genially.com/s3fs-public/2025-09/Mobile_Topbar_Plans.png?VersionId=myEI1OnsdLYkuJS6_UhzofcGvr_MtZ.t — 200 — 57.8 KiB — 115 ms — h2https://dev.visualwebsiteoptimizer.com/j.php?a=651973&u=https%3A%2F%2Fgenially.com%2F&vn=2.1&x=truedev.visualwebsiteoptimizer.com/j.ph... https://dev.visualwebsiteoptimizer.com/j.php?a=651973&u=https%3A%2F%2Fgenially.com%2F&vn=2.1&x=true — 200 — 8.6 KiB — 103 ms — h2https://assets.genially.com/s3fs-public/2025-09/Mobile_Topbar_PlansForTeachers.png?VersionId=9M0sMpk_9aWbgwjAm1g3x5CFze9Jqj8oassets.genially.com/s3fs-public/202... https://assets.genially.com/s3fs-public/2025-09/Mobile_Topbar_PlansForTeachers.png?VersionId=9M0sMpk_9aWbgwjAm1g3x5CFze9Jqj8o — 200 — 60.9 KiB — 119 ms — h2https://webforms.pipedrive.com/f/loaderwebforms.pipedrive.com/f/loader https://webforms.pipedrive.com/f/loader — 303 — 1.1 KiB — 229 ms — h2https://accounts.google.com/gsi/clientaccounts.google.com/gsi/client https://accounts.google.com/gsi/client — 200 — 96.4 KiB — 125 ms — h2https://assets.genially.com/s3fs-public/images/Brands_Logo_Figma_White.png?VersionId=ArNFTfFmDSMawwR.10P7xvU4D3YIfpDKassets.genially.com/s3fs-public/ima... https://assets.genially.com/s3fs-public/images/Brands_Logo_Figma_White.png?VersionId=ArNFTfFmDSMawwR.10P7xvU4D3YIfpDK — 200 — 4.5 KiB — 105 ms — h2https://assets.genially.com/s3fs-public/images/Brands_Logo_Columbia-University_White_0.png?VersionId=M4gNWysLLyeLmaUr997sE_5vBTYRm96rassets.genially.com/s3fs-public/ima... https://assets.genially.com/s3fs-public/images/Brands_Logo_Columbia-University_White_0.png?VersionId=M4gNWysLLyeLmaUr997sE_5vBTYRm96r — 200 — 8.2 KiB — 106 ms — h2https://assets.genially.com/s3fs-public/images/Brands_Logo_Tik-Tok_White.png?VersionId=wZfuYW0ZdWZIn4hzfGK5SACjNGDIPNpPassets.genially.com/s3fs-public/ima... https://assets.genially.com/s3fs-public/images/Brands_Logo_Tik-Tok_White.png?VersionId=wZfuYW0ZdWZIn4hzfGK5SACjNGDIPNpP — 200 — 4.5 KiB — 104 ms — h2https://genially.com/static/sprite-6ad6d97f187ac0da227ff6d2d42aac2d.svg/static/sprite-6ad6d97f187ac0da227f... https://genially.com/static/sprite-6ad6d97f187ac0da227ff6d2d42aac2d.svg — 200 — 132.9 KiB — 141 ms — h2https://genially.com/manifest.webmanifest/manifest.webmanifest https://genially.com/manifest.webmanifest — 200 — 2.1 KiB — 46 ms — h2https://assets.genially.com/s3fs-public/images/Logo_PCMag.png?VersionId=uaxNWGgxYIXodFmw1zxpPrMUl845NRcsassets.genially.com/s3fs-public/ima... https://assets.genially.com/s3fs-public/images/Logo_PCMag.png?VersionId=uaxNWGgxYIXodFmw1zxpPrMUl845NRcs — 200 — 5.0 KiB — 81 ms — h2https://assets.genially.com/s3fs-public/images/logo-Telefonica-white.png?VersionId=vOLSkRL9b0J4sCI0v7ejfio3lFtaa5P4assets.genially.com/s3fs-public/ima... https://assets.genially.com/s3fs-public/images/logo-Telefonica-white.png?VersionId=vOLSkRL9b0J4sCI0v7ejfio3lFtaa5P4 — 200 — 3.4 KiB — 97 ms — h2https://assets.genially.com/s3fs-public/images/Brands_Logo_Santillana_White.png?VersionId=R1lJ1fyleYlGjpluRa5VDUQlBIqHdBjCassets.genially.com/s3fs-public/ima... https://assets.genially.com/s3fs-public/images/Brands_Logo_Santillana_White.png?VersionId=R1lJ1fyleYlGjpluRa5VDUQlBIqHdBjC — 200 — 5.7 KiB — 90 ms — h2https://assets.genially.com/s3fs-public/images/Logo_FastCompany.png?VersionId=KG4RUaCle8Y7sSOgNmQaBplvFJMX9CGdassets.genially.com/s3fs-public/ima... https://assets.genially.com/s3fs-public/images/Logo_FastCompany.png?VersionId=KG4RUaCle8Y7sSOgNmQaBplvFJMX9CGd — 200 — 4.6 KiB — 137 ms — h2https://assets.genially.com/s3fs-public/images/Logo_EdSurge.png?VersionId=SQB2O7gJhpZFJtrQUg6pecpqhs5yqRpiassets.genially.com/s3fs-public/ima... https://assets.genially.com/s3fs-public/images/Logo_EdSurge.png?VersionId=SQB2O7gJhpZFJtrQUg6pecpqhs5yqRpi — 200 — 4.3 KiB — 80 ms — h2https://assets.genially.com/s3fs-public/images/G2%204.6%20stars.png?VersionId=6dSqDLuFWME9DEF8AZms95Yu035Fta9Gassets.genially.com/s3fs-public/ima... https://assets.genially.com/s3fs-public/images/G2%204.6%20stars.png?VersionId=6dSqDLuFWME9DEF8AZms95Yu035Fta9G — 200 — 5.3 KiB — 125 ms — h2https://assets.genially.com/s3fs-public/images/Home%20Aug%2025%20_%20Boost%20engagement%20in%20the%20classroom.png?VersionId=IScT4AcnQWqZVRtKdaTMzgbi8dNI1DZZassets.genially.com/s3fs-public/ima... https://assets.genially.com/s3fs-public/images/Home%20Aug%2025%20_%20Boost%20engagement%20in%20the%20classroom.png?VersionId=IScT4AcnQWqZVRtKdaTMzgbi8dNI1DZZ — 200 — 105.2 KiB — 109 ms — 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HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
8% of JavaScript execution is third-party
First-party Third-party 1386ms · 225KB · €4/mo
Unattributable
Other
Costly
Execution 982ms
Transfer 0 KB
Monthly Cost €3/mo
dev.visualwebsiteoptimizer.com
Other
Optional
Execution 176ms
Transfer 4 KB
Monthly Cost €1/mo
accounts.google.com
Other
Optional
Execution 117ms
Transfer 96 KB
Unused 71%
Monthly Cost €0/mo
cdn.lr-in-prod.com
Other
Optional
Execution 111ms
Transfer 124 KB
Unused 35%
Monthly Cost €0/mo

These scripts may cost more than they're worth

  • Unattributable adds 982ms and costs ~€3/month

Unattributable takes 982ms 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

71% of accounts.google.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

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