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https://www.tiktok.com

Performance

· 16 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
71
GRADE
C
FIX
5
REVIEW
2
PASS
7
INFO
2

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

Mobile Desktop
26
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.
73
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
83
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.

12.27 s

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

20.49 s

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

3.71 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.

12.27 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.

21.02 s

Page Load Progression

773 ms
1.5 s
2.3 s
3.1 s
3.9 s
4.6 s
5.4 s
6.2 s
Checks
16
7 PASS 2 REVIEW 5 FIX
F
Page Weight Budget
Action
4.3 MB transferred, 179 requests
FIX
4.3 MB transferred, 179 requests
Critical::
Page weighs 11.5 MB (4.3 MB transferred)
Warning::
JavaScript is 2.3 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 2.3 MB
Info::
Fonts are 286 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 286 KB
Warning::
179 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.91 g CO2 per page load
4.3 MB / 2.4 MB budget
4.3 MB transferred
179 requests
0.91 g CO2 per page load
JavaScript 2.3 MiB 54%
Other 1.4 MiB 32%
Fonts 285.7 KiB 6%
Images 103.6 KiB 2%
Other 77.7 KiB 2%
CSS 74.8 KiB 2%
HTML 51.8 KiB 1%
Other 16.6 KiB 0%
Other 1.4 KiB 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

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

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 (4.2 MiB of 4.3 MiB)
Info::
Third-party blocking time is low (0 ms)
97%
First-party Third-party
F
JS Execution Cost
Action
12515ms total JS execution
FIX
12515ms total JS execution
Warning::
https://sf16-website-login.neutral.tiktokcdn-eu.co...: 3842ms CPU time
Warning::
https://sf16-website-login.neutral.tiktokcdn-eu.co...: 3437ms CPU time
Warning::
https://sf16-website-login.neutral.tiktokcdn-eu.co...: 1404ms CPU time
Warning::
Unattributable: 937ms CPU time
Warning::
https://www.tiktok.com/: 434ms CPU time
Warning::
Third-party scripts: 12081ms (97% of total)

Main Thread Breakdown

Script Evaluation 62% Style & Layout 18% Other 10% Script Parsing & Compilation 6%
ScriptTotalScriptingParse/CompileParty
https://sf16-website-login.neutral.tiktokcdn-eu.com/obj/tiktok_web_login_static_eu/webmssdk/1.0.0.347/webmssdk.js3842ms2172ms18ms3rd
https://sf16-website-login.neutral.tiktokcdn-eu.com/obj/tiktok_web_login_static_eu/tiktok/webapp/main/mobile/app_portal/static/js/async/cache.react_dom.a489a181.js3437ms2932ms15ms3rd
https://sf16-website-login.neutral.tiktokcdn-eu.com/obj/tiktok_web_login_static_eu/tiktok/webapp/main/mobile/app_portal/static/js/async/app.fe07af5b.js1404ms871ms113ms3rd
Unattributable937ms122ms0ms3rd
https://www.tiktok.com/434ms6ms0ms1st
https://sf16-website-login.neutral.tiktokcdn-eu.com/obj/tiktok_web_login_static_eu/tiktok_privacy_protection_framework/loader/1.0.0.933/index.js404ms307ms50ms3rd
https://sf16-website-login.neutral.tiktokcdn-eu.com/obj/tiktok_web_login_static_eu/pns/tiktok-cookie-banner/1.0.0.285/default.eu-ttp.esm.js324ms243ms63ms3rd
https://sf16-website-login.neutral.tiktokcdn-eu.com/obj/tiktok_web_login_static_eu/tiktok/webapp/main/mobile/app_portal/static/js/async/7036.4e3fb56d.js312ms248ms58ms3rd
https://sf16-website-login.neutral.tiktokcdn-eu.com/obj/tiktok_web_login_static_eu/tiktok/webapp/main/mobile/app_portal/static/js/main.4daa8e29.js236ms197ms39ms3rd
https://sf16-website-login.neutral.tiktokcdn-eu.com/obj/tiktok_web_login_static_eu/slardar/fe/sdk-web/browser.euttp.js?bid=tiktok_webapp&globalName=SlardarClient232ms112ms4ms3rd

Showing top 10 of 20 scripts

F
JS Bundles
Action
67 scripts, 817 KB unused
FIX
67 scripts, 817 KB unused
Warning::
https://sf16-website-login.neutral.tiktokcdn-eu.co...: 140 KB unused (44%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://sf16-website-login.neutral.tiktokcdn-eu.co...: 119 KB unused (56%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://sf16-website-login.neutral.tiktokcdn-eu.co...: 97 KB unused (55%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://sf16-website-login.neutral.tiktokcdn-eu.co...: 82 KB unused (64%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://sf16-website-login.neutral.tiktokcdn-eu.co...: 69 KB unused (68%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 817 KB
817 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://sf16-website-login.neutral.tiktokcdn-eu.com/obj/tiktok_web_login_static_eu/tiktok/webapp/main/mobile/app_portal/static/js/async/app.fe07af5b.js318 KB140 KB (44%)✓3rd
https://sf16-website-login.neutral.tiktokcdn-eu.com/obj/tiktok_web_login_static_eu/tiktok/webapp/main/mobile/app_portal/static/js/async/9057.84dc5d9a.js213 KB119 KB (56%)✓3rd
https://sf16-website-login.neutral.tiktokcdn-eu.com/obj/tiktok_web_login_static_eu/pns/tiktok-cookie-banner/1.0.0.285/default.eu-ttp.esm.js178 KB97 KB (55%)✓3rd
https://sf16-website-login.neutral.tiktokcdn-eu.com/obj/tiktok_web_login_static_eu/tiktok/webapp/main/mobile/app_portal/static/js/async/7036.4e3fb56d.js129 KB82 KB (64%)✓3rd
https://sf16-website-login.neutral.tiktokcdn-eu.com/obj/tiktok_web_login_static_eu/tiktok/webapp/main/mobile/app_portal/static/js/async/cache.tux.f86b70e5.js103 KB69 KB (68%)✓3rd
https://sf16-website-login.neutral.tiktokcdn-eu.com/obj/tiktok_web_login_static_eu/tiktok/webapp/main/mobile/app_portal/static/js/async/1839.eef447aa.js78 KB67 KB (87%)✓3rd
https://sf16-website-login.neutral.tiktokcdn-eu.com/obj/tiktok_web_login_static_eu/tiktok/webapp/main/mobile/app_portal/static/js/async/3005.52bfa1ad.js65 KB45 KB (70%)✓3rd
https://sf16-website-login.neutral.tiktokcdn-eu.com/obj/tiktok_web_login_static_eu/tiktok/webapp/main/mobile/app_portal/static/js/async/8473.df81b7a3.js120 KB44 KB (37%)✓3rd
https://sf16-website-login.neutral.tiktokcdn-eu.com/obj/tiktok_web_login_static_eu/tiktok/webapp/main/mobile/app_portal/static/js/cache.tea.059d38c7.js71 KB42 KB (61%)✓3rd
https://sf16-website-login.neutral.tiktokcdn-eu.com/obj/tiktok_web_login_static_eu/tiktok/webapp/main/mobile/app_portal/static/js/async/1551.b79ef958.js45 KB40 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

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: max-age=0, no-cache, no-store
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

max-age=0, no-cache, no-store

DirectiveValueMeaning
max-age0Cache for 0 seconds
no-cache—Cache but always revalidate first
no-store—Never cache this response
B
Image Optimization
12 images, 0 KB saveable
REVIEW
12 images, 0 KB saveable
Warning::
https://sf16-website-login.neutral.tiktokcdn-eu.co... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
12 images 104 KB
0 oversized -0 KB
6 legacy format
1 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

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
9 fonts (286 KB)
PASS
9 fonts (286 KB)
Info::
9 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

9

286 KB total

Render-blocking

0

of 9

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 14.0 s 16.0 s 18.0 s 20.0 s FCP 12.3 s LCP 20.5 shttps://sf16-website-login.neutral.ttwstatic.com/obj/tiktok_web_login_static/tiktok_fonts/TikTokFont-Semibold.woff2?_default_font=1&v=2TikTokFont-Semibold.woff2 https://sf16-website-login.neutral.ttwstatic.com/obj/tiktok_web_login_static/tiktok_fonts/TikTokFont-Semibold.woff2?_default_font=1&v=2 — 56.7 KiB — 0 ms — font-display: swaphttps://sf16-website-login.neutral.ttwstatic.com/obj/tiktok_web_login_static/tiktok_fonts/TikTokFont-Regular.woff2?_default_font=1&v=2TikTokFont-Regular.woff2 https://sf16-website-login.neutral.ttwstatic.com/obj/tiktok_web_login_static/tiktok_fonts/TikTokFont-Regular.woff2?_default_font=1&v=2 — 56.1 KiB — 0 ms — font-display: swaphttps://sf16-website-login.neutral.ttwstatic.com/obj/tiktok_web_login_static/tiktok_fonts/TikTokDisplayFont-Bold.woff2?_default_font=1&v=2TikTokDisplayFont-Bold.... https://sf16-website-login.neutral.ttwstatic.com/obj/tiktok_web_login_static/tiktok_fonts/TikTokDisplayFont-Bold.woff2?_default_font=1&v=2 — 58.4 KiB — 0 ms — font-display: swaphttps://sf16-website-login.neutral.ttwstatic.com/obj/tiktok_web_login_static/tiktok_fonts/TikTokFont-Bold.woff2?_default_font=1&v=2TikTokFont-Bold.woff2 https://sf16-website-login.neutral.ttwstatic.com/obj/tiktok_web_login_static/tiktok_fonts/TikTokFont-Bold.woff2?_default_font=1&v=2 — 57.8 KiB — 0 ms — font-display: swaphttps://sf16-website-login.neutral.ttwstatic.com/obj/tiktok_web_login_static/tiktok_fonts/TikTokFont-SEMIBOLD.woff2?_default_font=1&v=2TikTokFont-SEMIBOLD.woff2 https://sf16-website-login.neutral.ttwstatic.com/obj/tiktok_web_login_static/tiktok_fonts/TikTokFont-SEMIBOLD.woff2?_default_font=1&v=2 — 56.6 KiB — 0 ms — font-display: swaphttps://sf16-website-login.neutral.ttwstatic.com/obj/tiktok_web_login_static/tiktok_fonts/TikTokFont-Semibold.woff2?_default_font=1&v=2TikTokFont-Semibold.woff2 https://sf16-website-login.neutral.ttwstatic.com/obj/tiktok_web_login_static/tiktok_fonts/TikTokFont-Semibold.woff2?_default_font=1&v=2 — 0 B — 0 ms — font-display: swaphttps://sf16-website-login.neutral.ttwstatic.com/obj/tiktok_web_login_static/tiktok_fonts/TikTokFont-Regular.woff2?_default_font=1&v=2TikTokFont-Regular.woff2 https://sf16-website-login.neutral.ttwstatic.com/obj/tiktok_web_login_static/tiktok_fonts/TikTokFont-Regular.woff2?_default_font=1&v=2 — 0 B — 0 ms — font-display: swaphttps://sf16-website-login.neutral.ttwstatic.com/obj/tiktok_web_login_static/tiktok_fonts/TikTokFont-Bold.woff2?_default_font=1&v=2TikTokFont-Bold.woff2 https://sf16-website-login.neutral.ttwstatic.com/obj/tiktok_web_login_static/tiktok_fonts/TikTokFont-Bold.woff2?_default_font=1&v=2 — 0 B — 0 ms — font-display: swaphttps://sf16-website-login.neutral.ttwstatic.com/obj/tiktok_web_login_static/tiktok_fonts/TikTokDisplayFont-Bold.woff2?_default_font=1&v=2TikTokDisplayFont-Bold.... https://sf16-website-login.neutral.ttwstatic.com/obj/tiktok_web_login_static/tiktok_fonts/TikTokDisplayFont-Bold.woff2?_default_font=1&v=2 — 0 B — 0 ms — font-display: swap
TikTokFont-Semibold.woff2 woff2 swap
Size 57 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
TikTokFont-Regular.woff2 woff2 swap
Size 56 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
TikTokDisplayFont-Bold.... woff2 swap
Size 58 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
TikTokFont-Bold.woff2 woff2 swap
Size 58 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
TikTokFont-SEMIBOLD.woff2 woff2 swap
Size 57 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
TikTokFont-Semibold.woff2 woff2 swap
Size 0 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
TikTokFont-Regular.woff2 woff2 swap
Size 0 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
TikTokFont-Bold.woff2 woff2 swap
Size 0 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
TikTokDisplayFont-Bold.... woff2 swap
Size 0 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
54 hints, 0 missing preconnects
PASS
54 hints, 0 missing preconnects
Info::
Page uses 54 resource hint(s)

Current Resource Hints

preconnect
1
preload
+37
47
dns-prefetch
3
prefetch
3

54 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
179 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
97% of JavaScript execution is third-party
First-party Third-party 12081ms · 1621KB · €131/mo
sf16-website-login.neutral.tiktokcdn-eu.com
Other
Costly
Execution 3842ms
Transfer 94 KB
Monthly Cost €42/mo
sf16-website-login.neutral.tiktokcdn-eu.com
Other
Costly
Execution 3437ms
Transfer 54 KB
Unused 50%
Monthly Cost €37/mo
sf16-website-login.neutral.tiktokcdn-eu.com
Other
Costly
Execution 1404ms
Transfer 318 KB
Unused 44%
Monthly Cost €15/mo
Unattributable
Other
Costly
Execution 937ms
Transfer 0 KB
Monthly Cost €10/mo
sf16-website-login.neutral.tiktokcdn-eu.com
Other
Costly
Execution 404ms
Transfer 38 KB
Monthly Cost €4/mo
sf16-website-login.neutral.tiktokcdn-eu.com
Other
Costly
Execution 324ms
Transfer 178 KB
Unused 55%
Monthly Cost €4/mo
sf16-website-login.neutral.tiktokcdn-eu.com
Other
Costly
Execution 312ms
Transfer 129 KB
Unused 64%
Monthly Cost €3/mo
sf16-website-login.neutral.tiktokcdn-eu.com
Other
Costly
Execution 236ms
Transfer 44 KB
Monthly Cost €3/mo
sf16-website-login.neutral.tiktokcdn-eu.com
Other
Costly
Execution 232ms
Transfer 16 KB
Monthly Cost €3/mo
sf16-website-login.neutral.ttwstatic.com
Other
Optional
Execution 193ms
Transfer 42 KB
Unused 51%
Monthly Cost €2/mo
sf16-website-login.neutral.ttwstatic.com
Other
Optional
Execution 137ms
Transfer 92 KB
Monthly Cost €1/mo
sf16-website-login.neutral.tiktokcdn-eu.com
Other
Optional
Execution 109ms
Transfer 9 KB
Monthly Cost €1/mo
sf16-website-login.neutral.tiktokcdn-eu.com
Other
Optional
Execution 101ms
Transfer 120 KB
Unused 37%
Monthly Cost €1/mo
sf16-website-login.neutral.tiktokcdn-eu.com
Other
Optional
Execution 78ms
Transfer 65 KB
Unused 70%
Monthly Cost €1/mo
sf16-website-login.neutral.tiktokcdn-eu.com
Other
Optional
Execution 77ms
Transfer 36 KB
Monthly Cost €1/mo
sf16-website-login.neutral.tiktokcdn-eu.com
Other
Optional
Execution 74ms
Transfer 37 KB
Monthly Cost €1/mo
sf16-website-login.neutral.tiktokcdn-eu.com
Other
Optional
Execution 69ms
Transfer 213 KB
Unused 56%
Monthly Cost €1/mo
sf16-website-login.neutral.tiktokcdn-eu.com
Other
Optional
Execution 61ms
Transfer 103 KB
Unused 68%
Monthly Cost €1/mo
sf16-website-login.neutral.tiktokcdn-eu.com
Other
Optional
Execution 53ms
Transfer 32 KB
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • sf16-website-login.neutral.tiktokcdn-eu.com adds 3842ms and costs ~€42/month
  • sf16-website-login.neutral.tiktokcdn-eu.com adds 3437ms and costs ~€37/month
  • sf16-website-login.neutral.tiktokcdn-eu.com adds 1404ms and costs ~€15/month
  • Unattributable adds 937ms and costs ~€10/month
  • sf16-website-login.neutral.tiktokcdn-eu.com adds 404ms and costs ~€4/month
  • sf16-website-login.neutral.tiktokcdn-eu.com adds 324ms and costs ~€4/month
  • sf16-website-login.neutral.tiktokcdn-eu.com adds 312ms and costs ~€3/month
  • sf16-website-login.neutral.tiktokcdn-eu.com adds 236ms and costs ~€3/month
  • sf16-website-login.neutral.tiktokcdn-eu.com adds 232ms and costs ~€3/month

97% 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

sf16-website-login.neutral.tiktokcdn-eu.com takes 3842ms 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

sf16-website-login.neutral.tiktokcdn-eu.com takes 3437ms 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

sf16-website-login.neutral.tiktokcdn-eu.com takes 1404ms 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 937ms 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

sf16-website-login.neutral.tiktokcdn-eu.com takes 404ms 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

sf16-website-login.neutral.tiktokcdn-eu.com takes 324ms 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

55% of sf16-website-login.neutral.tiktokcdn-eu.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

sf16-website-login.neutral.tiktokcdn-eu.com takes 312ms 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

64% of sf16-website-login.neutral.tiktokcdn-eu.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

sf16-website-login.neutral.tiktokcdn-eu.com takes 236ms 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

sf16-website-login.neutral.tiktokcdn-eu.com takes 232ms 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 sf16-website-login.neutral.ttwstatic.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

70% of sf16-website-login.neutral.tiktokcdn-eu.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

56% of sf16-website-login.neutral.tiktokcdn-eu.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

68% of sf16-website-login.neutral.tiktokcdn-eu.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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