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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
69
GRADE
D
FIX
6
REVIEW
1
PASS
8
INFO
2

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

Mobile Desktop
35
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
92
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.
100
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.

2.99 s

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

7.92 s

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

2.05 s

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.

8.34 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.

20.14 s

Page Load Progression

429 ms
857 ms
1.3 s
1.7 s
2.1 s
2.6 s
3.0 s
3.4 s
Checks
17
8 PASS 1 REVIEW 6 FIX
F
Page Weight Budget
Action
3.3 MB transferred, 118 requests
FIX
3.3 MB transferred, 118 requests
Warning::
Page weighs 14.1 MB (3.3 MB transferred)
Warning::
JavaScript is 1.6 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.6 MB
Warning::
Images are 1.0 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.0 MB
Warning::
118 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.68 g CO2 per page load
3.3 MB / 2.4 MB budget
3.3 MB transferred
118 requests
0.68 g CO2 per page load
JavaScript 1.6 MiB 48%
Images 1.0 MiB 32%
Other 166.1 KiB 5%
Other 159.1 KiB 5%
Other 93.0 KiB 3%
Fonts 90.5 KiB 3%
HTML 87.3 KiB 3%
CSS 54.6 KiB 2%
Other 1.0 KiB 0%
Other 349 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

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

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
97% third-party, 0 ms blocking
FIX
97% third-party, 0 ms blocking
Warning::
Third-party code accounts for 97% of page weight (3.2 MiB of 3.3 MiB)
Info::
Third-party blocking time is low (0 ms)
97%
First-party Third-party
F
JS Execution Cost
Action
6667ms total JS execution
FIX
6667ms total JS execution
Warning::
https://assets.quizlet.com/_next/static/chunks/fra...: 1462ms CPU time
Warning::
https://cdn.ketchjs.com/ketchtag/stable/v2.12/ketc...: 1127ms CPU time
Warning::
https://quizlet.com/: 933ms CPU time
Warning::
Unattributable: 791ms CPU time
Warning::
https://assets.quizlet.com/_next/static/chunks/pag...: 749ms CPU time
Warning::
Third-party scripts: 5441ms (82% of total)

Main Thread Breakdown

Script Evaluation 63% Other 14% Style & Layout 9% Script Parsing & Compilation 8%
ScriptTotalScriptingParse/CompileParty
https://assets.quizlet.com/_next/static/chunks/framework-933342139233d004.js1462ms1330ms20ms3rd
https://cdn.ketchjs.com/ketchtag/stable/v2.12/ketch-sdk.js1127ms884ms157ms3rd
https://quizlet.com/933ms111ms8ms1st
Unattributable791ms91ms0ms3rd
https://assets.quizlet.com/_next/static/chunks/pages/_app-de2496ec362329c1.js749ms582ms162ms3rd
https://cdnjs.cloudflare.com/ajax/libs/rollbar.js/2.26.1/rollbar.min.js486ms400ms6ms3rd
https://quizlet.com/cdn-cgi/challenge-platform/scripts/jsd/main.js293ms229ms2ms1st
https://www.googletagmanager.com/gtm.js?id=GTM-5GTSWTM240ms195ms40ms3rd
https://www.googletagmanager.com/gtag/js?id=AW-943230862&cx=c&gtm=4e64h1212ms178ms33ms3rd
https://assets.quizlet.com/static/qw5r9bny.4.6.5.min.js111ms45ms7ms3rd

Showing top 10 of 13 scripts

F
JS Bundles
Action
27 scripts, 658 KB unused
FIX
27 scripts, 658 KB unused
Warning::
https://assets.quizlet.com/_next/static/chunks/pag...: 259 KB unused (44%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdn.ketchjs.com/ketchtag/stable/v2.12/ketc...: 107 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-5GT...: 80 KB unused (45%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://accounts.google.com/gsi/client: 71 KB unused (75%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=AW-943...: 64 KB unused (44%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 658 KB
658 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://assets.quizlet.com/_next/static/chunks/pages/_app-de2496ec362329c1.js584 KB259 KB (44%)✓3rd
https://cdn.ketchjs.com/ketchtag/stable/v2.12/ketch-sdk.js259 KB107 KB (41%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-5GTSWTM178 KB80 KB (45%)✓3rd
https://accounts.google.com/gsi/client96 KB71 KB (75%)✓3rd
https://www.googletagmanager.com/gtag/js?id=AW-943230862&cx=c&gtm=4e64h1145 KB64 KB (44%)✓3rd
https://client.px-cloud.net/PXVlUfj7uV/main.min.js95 KB36 KB (37%)✓3rd
https://assets.quizlet.com/_next/static/chunks/framework-933342139233d004.js58 KB21 KB (35%)✓3rd
https://assets.quizlet.com/_next/static/chunks/main-7612702718e98844.js40 KB20 KB (51%)✓3rd
https://assets.quizlet.com/_next/static/chunks/30588.837306e3a6b9e246.js3 KB—✓3rd
https://assets.quizlet.com/_next/static/chunks/7003.4ac74c60e3205087.js4 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

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

F
Page Weight Inventory
Action
118 resources · 3.3 MB · 658 KB savings available
FIX
118 resources · 3.3 MB · 658 KB savings available
Warning::
Page weight 2.3 MB over 1MB target
Got: 3.3 MB Expected: ≤ 1 MB
Info::
~658 KB of savings available
Warning::
112 third-party resources (97% of weight)
Info::
2 resources over 200KB
118 resources · 3.3 MiB · 112 third-party 2.3 MiB over 1MB target
JavaScript 48% · 1.6 MiB
Image 37% · 1.2 MiB
Other 8% · 260.6 KiB
Font 3% · 90.5 KiB
Document 3% · 87.6 KiB
CSS 2% · 54.6 KiB

~657.8 KiB of savings available

Remove unused JavaScript: 657.8 KiB
D
HTTP Caching
Action
no-store (uncacheable)
FIX
no-store (uncacheable)
Info::
Cache-Control: no-store prevents all caching
Intentional for dynamic content, but increases server load for every page view.
Got: private, max-age=0, no-store, no-cache, must-revalidate, post-check=0, pre-check=0
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

private, max-age=0, no-store, no-cache, must-revalidate, post-check=0, pre-check=0

DirectiveValueMeaning
private—Only browser cache, not CDN/proxy
max-age0Cache for 0 seconds
no-store—Never cache this response
no-cache—Cache but always revalidate first
must-revalidate—Must recheck with server after expiry
post-check0
pre-check0
C
Image Optimization
Action
42 images, 0 KB saveable
REVIEW
42 images, 0 KB saveable
Warning::
https://images.prismic.io/quizlet-web/ZpWfER5LeNNT... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://images.prismic.io/quizlet-web/ZpWfEh5LeNNT... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://images.prismic.io/quizlet-web/ZpFqjB5LeNNT... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://images.prismic.io/quizlet-web/ZpWfEx5LeNNT... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
42 images 1.0 MB
0 oversized -0 KB
30 legacy format
4 missing dimensions CLS risk

Set explicit width and height to prevent CLS.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

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 (91 KB)
PASS
5 fonts (91 KB)
Info::
5 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

5

91 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 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s 8.0 s FCP 3.0 s LCP 7.9 shttps://assets.quizlet.com/_next/static/media/hurmegeosans-no2-400.70b8c5c1.woff2hurmegeosans-no2-400.70... https://assets.quizlet.com/_next/static/media/hurmegeosans-no2-400.70b8c5c1.woff2 — 15.3 KiB — 125 ms — font-display: swaphttps://assets.quizlet.com/_next/static/media/hurmegeosans-no2-400.85194c42.woff2hurmegeosans-no2-400.85... https://assets.quizlet.com/_next/static/media/hurmegeosans-no2-400.85194c42.woff2 — 18.3 KiB — 120 ms — font-display: swaphttps://assets.quizlet.com/_next/static/media/hurmegeosans-no2-600.91becca0.woff2hurmegeosans-no2-600.91... https://assets.quizlet.com/_next/static/media/hurmegeosans-no2-600.91becca0.woff2 — 20.8 KiB — 121 ms — font-display: swaphttps://assets.quizlet.com/_next/static/media/hurmegeosans-no2-600.e647fc28.woff2hurmegeosans-no2-600.e6... https://assets.quizlet.com/_next/static/media/hurmegeosans-no2-600.e647fc28.woff2 — 17.9 KiB — 181 ms — font-display: swaphttps://assets.quizlet.com/_next/static/media/hurmegeosans-no2-700.36a1d2ca.woff2hurmegeosans-no2-700.36... https://assets.quizlet.com/_next/static/media/hurmegeosans-no2-700.36a1d2ca.woff2 — 18.2 KiB — 181 ms — font-display: swap
hurmegeosans-no2-400.70... woff2 swap
Size 15 KB
Load time 125 ms
Start 603 ms
Risk FOUT — text flashes from fallback to web font
hurmegeosans-no2-400.85... woff2 swap
Size 18 KB
Load time 120 ms
Start 603 ms
Risk FOUT — text flashes from fallback to web font
hurmegeosans-no2-600.91... woff2 swap
Size 21 KB
Load time 121 ms
Start 603 ms
Risk FOUT — text flashes from fallback to web font
hurmegeosans-no2-600.e6... woff2 swap
Size 18 KB
Load time 181 ms
Start 603 ms
Risk FOUT — text flashes from fallback to web font
hurmegeosans-no2-700.36... woff2 swap
Size 18 KB
Load time 181 ms
Start 604 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
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
A+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Cloudflare

Network Waterfall
118 requests over 4091ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s 8.0 s FCP 3.0 s LCP 7.9 shttps://quizlet.com// https://quizlet.com/ — 307 — 61 B — 76 ms — http/1.1https://quizlet.com// https://quizlet.com/ — 200 — 78.7 KiB — 545 ms — h2https://assets.quizlet.com/_next/static/media/icons.cbd68efe.svgassets.quizlet.com/_next/static/med... https://assets.quizlet.com/_next/static/media/icons.cbd68efe.svg — 200 — 153.8 KiB — 183 ms — h2https://assets.quizlet.com/static/ads-frontend.min.jsassets.quizlet.com/static/ads-front... https://assets.quizlet.com/static/ads-frontend.min.js — 200 — 664 B — 119 ms — h2https://assets.quizlet.com/_next/static/media/hurmegeosans-no2-400.70b8c5c1.woff2assets.quizlet.com/_next/static/med... https://assets.quizlet.com/_next/static/media/hurmegeosans-no2-400.70b8c5c1.woff2 — 200 — 15.3 KiB — 125 ms — h2https://assets.quizlet.com/_next/static/media/hurmegeosans-no2-400.85194c42.woff2assets.quizlet.com/_next/static/med... https://assets.quizlet.com/_next/static/media/hurmegeosans-no2-400.85194c42.woff2 — 200 — 18.3 KiB — 120 ms — h2https://assets.quizlet.com/_next/static/media/hurmegeosans-no2-600.91becca0.woff2assets.quizlet.com/_next/static/med... https://assets.quizlet.com/_next/static/media/hurmegeosans-no2-600.91becca0.woff2 — 200 — 20.8 KiB — 121 ms — h2https://assets.quizlet.com/_next/static/media/hurmegeosans-no2-600.e647fc28.woff2assets.quizlet.com/_next/static/med... https://assets.quizlet.com/_next/static/media/hurmegeosans-no2-600.e647fc28.woff2 — 200 — 17.9 KiB — 181 ms — h2https://assets.quizlet.com/_next/static/media/hurmegeosans-no2-700.36a1d2ca.woff2assets.quizlet.com/_next/static/med... https://assets.quizlet.com/_next/static/media/hurmegeosans-no2-700.36a1d2ca.woff2 — 200 — 18.2 KiB — 181 ms — h2https://accounts.google.com/gsi/clientaccounts.google.com/gsi/client https://accounts.google.com/gsi/client — 200 — 96.4 KiB — 160 ms — h2https://assets.quizlet.com/_next/static/css/f5f8e8db4ec4cde7.cssassets.quizlet.com/_next/static/css... https://assets.quizlet.com/_next/static/css/f5f8e8db4ec4cde7.css — 200 — 43.8 KiB — 146 ms — h2https://assets.quizlet.com/_next/static/css/e58f7073f3f58e3f.cssassets.quizlet.com/_next/static/css... https://assets.quizlet.com/_next/static/css/e58f7073f3f58e3f.css — 200 — 998 B — 109 ms — h2https://assets.quizlet.com/_next/static/css/a463ac27b8a64375.cssassets.quizlet.com/_next/static/css... https://assets.quizlet.com/_next/static/css/a463ac27b8a64375.css — 200 — 478 B — 105 ms — h2https://assets.quizlet.com/_next/static/css/8c1a8b827a75cdd3.cssassets.quizlet.com/_next/static/css... https://assets.quizlet.com/_next/static/css/8c1a8b827a75cdd3.css — 200 — 1.3 KiB — 102 ms — h2https://assets.quizlet.com/_next/static/css/896679d4d965c45e.cssassets.quizlet.com/_next/static/css... https://assets.quizlet.com/_next/static/css/896679d4d965c45e.css — 200 — 597 B — 106 ms — h2https://assets.quizlet.com/_next/static/css/8fb1331e497d81f5.cssassets.quizlet.com/_next/static/css... https://assets.quizlet.com/_next/static/css/8fb1331e497d81f5.css — 200 — 1.4 KiB — 98 ms — h2https://assets.quizlet.com/_next/static/css/c856d8f38589760c.cssassets.quizlet.com/_next/static/css... https://assets.quizlet.com/_next/static/css/c856d8f38589760c.css — 200 — 776 B — 103 ms — h2https://assets.quizlet.com/_next/static/css/fee99b6a963a3247.cssassets.quizlet.com/_next/static/css... https://assets.quizlet.com/_next/static/css/fee99b6a963a3247.css — 200 — 703 B — 104 ms — h2https://assets.quizlet.com/_next/static/css/3f0ae7a3e684c2ce.cssassets.quizlet.com/_next/static/css... https://assets.quizlet.com/_next/static/css/3f0ae7a3e684c2ce.css — 200 — 487 B — 105 ms — h2https://assets.quizlet.com/_next/static/css/37c0a6d87b1bccfc.cssassets.quizlet.com/_next/static/css... https://assets.quizlet.com/_next/static/css/37c0a6d87b1bccfc.css — 200 — 1.1 KiB — 109 ms — h2https://assets.quizlet.com/_next/static/css/9eab9ddec6bb0a62.cssassets.quizlet.com/_next/static/css... https://assets.quizlet.com/_next/static/css/9eab9ddec6bb0a62.css — 200 — 715 B — 98 ms — h2https://assets.quizlet.com/_next/static/css/b039cc973f663ea7.cssassets.quizlet.com/_next/static/css... https://assets.quizlet.com/_next/static/css/b039cc973f663ea7.css — 200 — 730 B — 105 ms — h2https://assets.quizlet.com/_next/static/css/376e9172f3d9c632.cssassets.quizlet.com/_next/static/css... https://assets.quizlet.com/_next/static/css/376e9172f3d9c632.css — 200 — 1.1 KiB — 109 ms — h2https://images.prismic.io/quizlet-web/aNHO-J5xUNkB0_yD_flashcards%402x.png?auto=format,compressimages.prismic.io/quizlet-web/aNHO-... https://images.prismic.io/quizlet-web/aNHO-J5xUNkB0_yD_flashcards%402x.png?auto=format,compress — 200 — 10.5 KiB — 65 ms — h2https://images.prismic.io/quizlet-web/Z08XDZbqstJ97_cj_practicetests.png?auto=format,compressimages.prismic.io/quizlet-web/Z08XD... https://images.prismic.io/quizlet-web/Z08XDZbqstJ97_cj_practicetests.png?auto=format,compress — 200 — 7.1 KiB — 75 ms — h2https://images.prismic.io/quizlet-web/aQ4sE7pReVYa4P1l_smart-assistv2.png?auto=format,compressimages.prismic.io/quizlet-web/aQ4sE... https://images.prismic.io/quizlet-web/aQ4sE7pReVYa4P1l_smart-assistv2.png?auto=format,compress — 200 — 9.2 KiB — 76 ms — h2https://images.prismic.io/quizlet-web/aQ4nxbpReVYa4Pz7_ArticleImage%402x.png?auto=format,compressimages.prismic.io/quizlet-web/aQ4nx... https://images.prismic.io/quizlet-web/aQ4nxbpReVYa4Pz7_ArticleImage%402x.png?auto=format,compress — 200 — 22.0 KiB — 70 ms — h2https://images.prismic.io/quizlet-web/aNHO-55xUNkB0_yG_learn-anything%402x.png?auto=format,compressimages.prismic.io/quizlet-web/aNHO-... https://images.prismic.io/quizlet-web/aNHO-55xUNkB0_yG_learn-anything%402x.png?auto=format,compress — 200 — 12.4 KiB — 60 ms — 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https://jg7y.quizlet.com/b4d71/tz9 — 200 — 185 B — 134 ms — h2https://cdn.ketchjs.com/ketchtag/stable/v2.12/ketch-sdk.jscdn.ketchjs.com/ketchtag/stable/v2.... https://cdn.ketchjs.com/ketchtag/stable/v2.12/ketch-sdk.js — 200 — 259.2 KiB — 39 ms — h2https://www.googletagmanager.com/gtag/js?id=AW-943230862&cx=c&gtm=4e64h1www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=AW-943230862&cx=c&gtm=4e64h1 — 200 — 145.1 KiB — 40 ms — h2https://client.px-cloud.net/PXVlUfj7uV/main.min.jsclient.px-cloud.net/PXVlUfj7uV/main... https://client.px-cloud.net/PXVlUfj7uV/main.min.js — 200 — 95.4 KiB — 56 ms — h2https://global.ketchcdn.com/web/v3/ipglobal.ketchcdn.com/web/v3/ip https://global.ketchcdn.com/web/v3/ip — 200 — 425 B — 4 ms — h3https://global.ketchcdn.com/web/v3/config/quizlet/website_smart_tag/production/gdpr_eprivacy/en-US/config.json?hash=2648353430476414063global.ketchcdn.com/web/v3/config/q... https://global.ketchcdn.com/web/v3/config/quizlet/website_smart_tag/production/gdpr_eprivacy/en-US/config.json?hash=2648353430476414063 — 200 — 161.0 KiB — 68 ms — h3https://pagead2.googlesyndication.com/ccm/collect?rcb=12&frm=0&en=page_view&dl=https%3A%2F%2Fquizlet.com%2F&scrsrc=www.googletagmanager.com&rnd=1189695767.1776812001&navt=n&npa=1&did=dN2JhM2&gdid=dN2JhM2&gtm=45be64h1v899146229z877848178za20gzb77848178zd77848178xec&gcs=G100&gcd=13p3p3p2l5l1&dma_cps=-&dma=1&tcfd=10001&tag_exp=0~115616986~115938465~115938469~117266400~118128922&apve=1&apvf=f&apvc=1&tids=AW-943230862&tid=AW-943230862&tft=1776812001246&tfd=1882pagead2.googlesyndication.com/ccm/c... 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h2https://assets.quizlet.com/_next/static/media/q-twilight.e27821d9.pngassets.quizlet.com/_next/static/med... https://assets.quizlet.com/_next/static/media/q-twilight.e27821d9.png — 200 — 2.4 KiB — 30 ms — h2https://assets.quizlet.com/static/brandmark/180.pngassets.quizlet.com/static/brandmark... https://assets.quizlet.com/static/brandmark/180.png — 200 — 2.5 KiB — 36 ms — h2https://static.cdn.prismic.io/prismic.js?repo=quizlet-web&new=truestatic.cdn.prismic.io/prismic.js?re... https://static.cdn.prismic.io/prismic.js?repo=quizlet-web&new=true — 200 — 9.8 KiB — 48 ms — h2https://quizlet-web.prismic.io/prismic-toolbar/4.1.2/iframe.htmlquizlet-web.prismic.io/prismic-tool... https://quizlet-web.prismic.io/prismic-toolbar/4.1.2/iframe.html — 200 — 7.5 KiB — 363 ms — h2https://global.ketchcdn.com/web/v3/consent/quizlet/getglobal.ketchcdn.com/web/v3/consent/... https://global.ketchcdn.com/web/v3/consent/quizlet/get — 200 — 1.4 KiB — 257 ms — h3https://js.px-cloud.net/?t=d-t0rn3wg4q-1776812001679&v=e41f4489-3dd4-11f1-8f13-d745e0e63e93js.px-cloud.net/?t=d-t0rn3wg4q-1776... https://js.px-cloud.net/?t=d-t0rn3wg4q-1776812001679&v=e41f4489-3dd4-11f1-8f13-d745e0e63e93 — 200 — 1.1 KiB — 38 ms — h2https://global.ketchcdn.com/web/v3/consent/quizlet/updateglobal.ketchcdn.com/web/v3/consent/... https://global.ketchcdn.com/web/v3/consent/quizlet/update — 200 — 0 B — 157 ms — h3https://global.ketchcdn.com/web/v3/consent/quizlet/updateglobal.ketchcdn.com/web/v3/consent/... https://global.ketchcdn.com/web/v3/consent/quizlet/update — 200 — 1.7 KiB — 282 ms — h3https://global.ketchcdn.com/gvl/eu/vendor-list.jsonglobal.ketchcdn.com/gvl/eu/vendor-l... https://global.ketchcdn.com/gvl/eu/vendor-list.json — 200 — 88.5 KiB — 5 ms — h3https://global.ketchcdn.com/gvl/eu/vendor-list.jsonglobal.ketchcdn.com/gvl/eu/vendor-l... https://global.ketchcdn.com/gvl/eu/vendor-list.json — 200 — 0 B — 4 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
82% of JavaScript execution is third-party
First-party Third-party 5441ms · 1417KB · $72/mo
assets.quizlet.com
Other
Costly
Execution 1462ms
Transfer 58 KB
Unused 35%
Monthly Cost $19/mo
cdn.ketchjs.com
Other
Costly
Execution 1127ms
Transfer 259 KB
Unused 41%
Monthly Cost $15/mo
Unattributable
Other
Costly
Execution 791ms
Transfer 0 KB
Monthly Cost $10/mo
assets.quizlet.com
Other
Costly
Execution 749ms
Transfer 584 KB
Unused 44%
Monthly Cost $10/mo
cdnjs
CDN
Costly
Execution 486ms
Transfer 21 KB
Monthly Cost $6/mo
Google Tag Manager
Tag Manager
Costly
Execution 240ms
Transfer 178 KB
Unused 45%
Monthly Cost $3/mo
Google Tag Manager
Tag Manager
Costly
Execution 212ms
Transfer 145 KB
Unused 44%
Monthly Cost $3/mo
assets.quizlet.com
Other
Optional
Execution 111ms
Transfer 26 KB
Monthly Cost $1/mo
assets.quizlet.com
Other
Optional
Execution 101ms
Transfer 40 KB
Unused 51%
Monthly Cost $1/mo
client.px-cloud.net
Other
Optional
Execution 98ms
Transfer 95 KB
Unused 37%
Monthly Cost $1/mo
static.cdn.prismic.io
Other
Optional
Execution 65ms
Transfer 10 KB
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • assets.quizlet.com adds 1462ms and costs ~$19/month
  • cdn.ketchjs.com adds 1127ms and costs ~$15/month
  • Unattributable adds 791ms and costs ~$10/month
  • assets.quizlet.com adds 749ms and costs ~$10/month
  • cdnjs adds 486ms and costs ~$6/month
  • Google Tag Manager adds 240ms and costs ~$3/month
  • Google Tag Manager adds 212ms and costs ~$3/month

82% 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

assets.quizlet.com takes 1462ms 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.ketchjs.com takes 1127ms 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 791ms 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

assets.quizlet.com takes 749ms 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

cdnjs takes 486ms 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

Google Tag Manager takes 240ms 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

Google Tag Manager takes 212ms 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

51% of assets.quizlet.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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