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https://Bili.works

Performance

· 22 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
83
GRADE
B
FIX
3
REVIEW
7
PASS
9
INFO
3

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

Mobile Desktop
91
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
96
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
96
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
91
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.

538 ms

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

1.88 s

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

94 ms

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

0.010

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

751 ms

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

1.88 s

Page Load Progression

454 ms
908 ms
1.4 s
1.8 s
2.3 s
2.7 s
3.2 s
3.6 s
Checks
22
9 PASS 7 REVIEW 3 FIX
D
Page Weight Budget
Action
2.3 MB transferred, 30 requests
FIX
2.3 MB transferred, 30 requests
Info::
Page weighs 4.5 MB (2.3 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 789 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 789 KB
Info::
Fonts are 229 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 229 KB
Info::
30 HTTP requests
Info::
Estimated 0.48 g CO2 per page load
2.3 MB / 2.4 MB budget
2.3 MB transferred
30 requests
0.48 g CO2 per page load
Images 1.2 MiB 53%
JavaScript 789.5 KiB 34%
Fonts 229.1 KiB 10%
CSS 55.5 KiB 2%
HTML 12.0 KiB 1%
Other 5.4 KiB 0%
Other 545 B 0%
0 2.4 MB 4.9 MB
Approaching limit

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
JS Bundles
Action
11 scripts, 263 KB unused
FIX
11 scripts, 263 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-HHL3...: 67 KB unused (43%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-HHL3...: 67 KB unused (43%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-TWM...: 65 KB unused (55%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-TWM...: 65 KB unused (55%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://bili.works/cookie-banner/silktide-consent-...: unminified — 2 KB could be saved
Info::
Total unused JavaScript: 263 KB
263 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-HHL341VPJT&cx=c&gtm=4e6562157 KB67 KB (43%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-HHL341VPJT&cx=c&gtm=4e6562157 KB67 KB (43%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-TWM2TJ5S119 KB65 KB (55%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-TWM2TJ5S119 KB65 KB (55%)✓3rd
https://bili.works/cookie-banner/silktide-consent-manager.js8 KB—✗1st
https://cdn.deftform.com/embed.js12 KB—✓3rd
https://cdn.deftform.com/scripts/nice-select2.js3 KB—✓3rd
https://cdn.deftform.com/scripts/iframe-resizer.child.js14 KB—✓3rd
https://share.deftform.com/build/assets/app-DXvwXSXm.js136 KB—✓3rd
https://share.deftform.com/flux/flux.min.js?id=65fdfb3161 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

D
Page Weight Inventory
Action
30 resources · 2.3 MB · 263 KB savings available
FIX
30 resources · 2.3 MB · 263 KB savings available
Warning::
Page weight 2.3 MB exceeds 1 MB target by 1.3 MB
Got: 2.3 MB Expected: ≤ 1 MB
Info::
~263 KB of savings available
Info::
19 third-party resources (36% of weight)
Info::
3 resources over 200KB
30 resources · 2.3 MiB · 19 third-party 1.3 MiB over 1MB target
Image 53% · 1.2 MiB
JavaScript 34% · 789.5 KiB
Font 10% · 229.1 KiB
CSS 2% · 55.5 KiB
Document 1% · 17.4 KiB
Other 0% · 545 B

~263.5 KiB of savings available

Remove unused JavaScript: 263.5 KiB
C
Image Optimization
Action
6 images, 0 KB saveable
REVIEW
6 images, 0 KB saveable
Warning::
https://bili.works/images/bili-logo.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://bili.works/images/hero-examples.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://bili.works/images/team.jpg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
6 images 1.2 MB
0 oversized -0 KB
6 legacy format
3 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

B
JS Execution Cost
711ms total JS execution
REVIEW
711ms total JS execution
Warning::
Unattributable: 257ms CPU time
Info::
https://bili.works/: 194ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-HHL3...: 142ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-TWM...: 118ms CPU time
Warning::
Third-party scripts: 517ms (73% of total)

Main Thread Breakdown

Script Evaluation 42% Other 33% Style & Layout 14% Script Parsing & Compilation 7%
ScriptTotalScriptingParse/CompileParty
Unattributable257ms64ms0ms3rd
https://bili.works/194ms14ms3ms1st
https://www.googletagmanager.com/gtag/js?id=G-HHL341VPJT&cx=c&gtm=4e6562142ms118ms22ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-TWM2TJ5S118ms89ms28ms3rd
B
HTTP/3 (QUIC)
HTTP/3 not advertised
REVIEW
HTTP/3 not advertised
Info::
HTTP/3 (QUIC) is not advertised
HTTP/3 isn't advertised via Alt-Svc and the worker didn't negotiate h3. HTTP/3 reduces handshake latency (1-RTT instead of 2-3 RTTs) and is more resilient on lossy connections. Most modern CDNs (Cloudflare, Fastly, AWS CloudFront, Google Cloud CDN) support HTTP/3 with a single config switch -- consider enabling for mobile-heavy workloads.
C
Compression Algorithm
Action
Main response served uncompressed
REVIEW
Main response served uncompressed
Info::
Main HTML response has no Content-Encoding (uncompressed)
The main HTML document is served without compression. The Text Compression section above lists the broader picture; for the main response specifically, even gzip would shave ~70-80% off most text payloads.
B
Main HTML Cache-Control
Main HTML max-age=600 (~10min)
REVIEW
Main HTML max-age=600 (~10min)
Info::
Main HTML cached for 10 minutes -- mild staleness risk
Got: max-age=600
B
Server-Timing Observability
No Server-Timing header found
REVIEW
No Server-Timing header found
Info::
No Server-Timing header found
Server-Timing exposes backend timing breakdowns to browser DevTools (e.g., `db: 45ms; render: 120ms; cache: 2ms`). Useful for diagnosing slow pages without backend log access. Most modern frameworks (Next.js, Cloudflare Workers, Fastly) emit it automatically; absence on a managed platform usually means telemetry headers are stripped at the edge.
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A
Third-Party Impact
36% third-party, 0 ms blocking
PASS
36% third-party, 0 ms blocking
Info::
Third-party code accounts for 36% of page weight (844.4 KiB of 2.3 MiB)
Info::
Third-party blocking time is low (0 ms)
64%
36%
First-party Third-party
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
2 fonts (229 KB)
PASS
2 fonts (229 KB)
Info::
2 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

2

229 KB total

Render-blocking

0

of 2

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 FCP 538 ms LCP 1.9 shttps://bili.works/fonts/DieGrotesk-A-Medium.otfDieGrotesk-A-Medium.otf https://bili.works/fonts/DieGrotesk-A-Medium.otf — 106.2 KiB — 34 ms — font-display: swaphttps://bili.works/fonts/DieGrotesk-A-Regular.otfDieGrotesk-A-Regular.otf https://bili.works/fonts/DieGrotesk-A-Regular.otf — 122.9 KiB — 45 ms — font-display: swap
DieGrotesk-A-Medium.otf otf swap
Size 106 KB
Load time 34 ms
Start 157 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
DieGrotesk-A-Regular.otf otf swap
Size 123 KB
Load time 45 ms
Start 157 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
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 ~183 KB and ~366 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
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
A+
LCP Image Preload
LCP preload audit not available
PASS
LCP preload audit not available
Info::
LCP image preload audit not available for this scan
A+
Server Response Intelligence
2 server-response signal(s) detected
PASS
2 server-response signal(s) detected
Info::
`Vary` header declared: Accept-Encoding
The page declares a `Vary` header, telling downstream caches which request headers the response varies on. Critical for content-negotiated responses (compression, language, cookies, device class).
Info::
Both `ETag` and `Last-Modified` present -- efficient revalidation supported
The page returns both `ETag` (content hash) and `Last-Modified` (timestamp) headers. Browsers can issue conditional GETs with `If-None-Match` or `If-Modified-Since`; the server returns 304 Not Modified for unchanged content, saving bandwidth. ETag is the more reliable of the two (timestamps fail in DST transitions and clock skew).
A+
HTTP Caching
max-age=600 (10 minutes)
PASS
max-age=600 (10 minutes)
Info::
Cache-Control header is set
Got: max-age=600
Info::
Effective TTL: 10 minutes (max-age=600)
Info::
ETag present — enables conditional (304) responses
Info::
Last-Modified header present
Cache-Control

max-age=600

DirectiveValueMeaning
max-age600Cache for 10 minutes
Effective TTL: 600 seconds
Network Waterfall
30 requests over 1336ms
INFO
0 ms 500 ms 1.0 s 1.5 s FCP 538 ms LCP 1.9 shttps://bili.works// https://bili.works/ — 200 — 4.4 KiB — 21 ms — h2https://bili.works/cookie-banner/silktide-consent-manager.css/cookie-banner/silktide-consent-man... https://bili.works/cookie-banner/silktide-consent-manager.css — 200 — 2.6 KiB — 11 ms — h2https://bili.works/cookie-banner/silktide-consent-manager.js/cookie-banner/silktide-consent-man... https://bili.works/cookie-banner/silktide-consent-manager.js — 200 — 7.9 KiB — 12 ms — h2https://bili.works/styles.css/styles.css https://bili.works/styles.css — 200 — 5.4 KiB — 25 ms — h2https://bili.works/images/bili-logo.svg/images/bili-logo.svg https://bili.works/images/bili-logo.svg — 200 — 714 B — 18 ms — h2https://bili.works/images/hero-examples.png/images/hero-examples.png https://bili.works/images/hero-examples.png — 200 — 287.5 KiB — 171 ms — h2https://cdn.deftform.com/embed.jscdn.deftform.com/embed.js https://cdn.deftform.com/embed.js — 200 — 12.2 KiB — 60 ms — h2https://bili.works/images/team.jpg/images/team.jpg https://bili.works/images/team.jpg — 200 — 373.4 KiB — 27 ms — h2https://www.googletagmanager.com/gtm.js?id=GTM-TWM2TJ5Swww.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-TWM2TJ5S — 200 — 118.6 KiB — 52 ms — h2https://bili.works/images/hero-background.png/images/hero-background.png https://bili.works/images/hero-background.png — 200 — 579.9 KiB — 52 ms — h2https://bili.works/fonts/DieGrotesk-A-Medium.otf/fonts/DieGrotesk-A-Medium.otf https://bili.works/fonts/DieGrotesk-A-Medium.otf — 200 — 106.2 KiB — 34 ms — h2https://bili.works/fonts/DieGrotesk-A-Regular.otf/fonts/DieGrotesk-A-Regular.otf https://bili.works/fonts/DieGrotesk-A-Regular.otf — 200 — 122.9 KiB — 45 ms — h2https://share.deftform.com/81e07bb4-0eef-4512-a253-a3af04bed541?embed=1&align=center&parentUrl=https%3A%2F%2Fbili.works%2F&parentReferrer=share.deftform.com/81e07bb4-0eef-45... https://share.deftform.com/81e07bb4-0eef-4512-a253-a3af04bed541?embed=1&align=center&parentUrl=https%3A%2F%2Fbili.works%2F&parentReferrer= — 200 — 7.6 KiB — 167 ms — h2https://cdn.deftform.com/scripts/nice-select2.jscdn.deftform.com/scripts/nice-selec... https://cdn.deftform.com/scripts/nice-select2.js — 200 — 3.3 KiB — 117 ms — h2https://cdn.deftform.com/scripts/iframe-resizer.child.jscdn.deftform.com/scripts/iframe-res... https://cdn.deftform.com/scripts/iframe-resizer.child.js — 200 — 14.1 KiB — 74 ms — h2https://share.deftform.com/build/assets/app-Cs3AlW6n.cssshare.deftform.com/build/assets/app... https://share.deftform.com/build/assets/app-Cs3AlW6n.css — 200 — 35.4 KiB — 40 ms — h2https://share.deftform.com/build/assets/app-CxHcPGqG.cssshare.deftform.com/build/assets/app... https://share.deftform.com/build/assets/app-CxHcPGqG.css — 200 — 3.3 KiB — 49 ms — h2https://share.deftform.com/build/assets/app-DXvwXSXm.jsshare.deftform.com/build/assets/app... https://share.deftform.com/build/assets/app-DXvwXSXm.js — 200 — 135.8 KiB — 112 ms — h2https://df-cdn.com/workspaces/1945c28f-eb2e-400d-bbd3-0a0b51fb5c89/1772634299-logo.pngdf-cdn.com/workspaces/1945c28f-eb2e... https://df-cdn.com/workspaces/1945c28f-eb2e-400d-bbd3-0a0b51fb5c89/1772634299-logo.png — 200 — 6.9 KiB — 77 ms — h2https://share.deftform.com/flux/flux.min.js?id=65fdfb31share.deftform.com/flux/flux.min.js... https://share.deftform.com/flux/flux.min.js?id=65fdfb31 — 200 — 60.6 KiB — 108 ms — h2https://www.googletagmanager.com/gtag/js?id=G-HHL341VPJT&cx=c&gtm=4e6562www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-HHL341VPJT&cx=c&gtm=4e6562 — 200 — 156.8 KiB — 50 ms — h2https://scripts.simpleanalyticscdn.com/latest.jsscripts.simpleanalyticscdn.com/late... https://scripts.simpleanalyticscdn.com/latest.js — 200 — 4.8 KiB — 57 ms — h2https://cdn.deftform.com/styles/phoneinput/intlTelInput.min.csscdn.deftform.com/styles/phoneinput/... https://cdn.deftform.com/styles/phoneinput/intlTelInput.min.css — 200 — 3.2 KiB — 20 ms — h2https://cdn.deftform.com/styles/nice-select2.csscdn.deftform.com/styles/nice-select... https://cdn.deftform.com/styles/nice-select2.css — 200 — 1.9 KiB — 23 ms — h2https://cdn.deftform.com/styles/glightbox.min.csscdn.deftform.com/styles/glightbox.m... https://cdn.deftform.com/styles/glightbox.min.css — 200 — 3.7 KiB — 32 ms — h2https://www.googletagmanager.com/gtm.js?id=GTM-TWM2TJ5Swww.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-TWM2TJ5S — 200 — 118.6 KiB — 33 ms — h2https://region1.google-analytics.com/g/collect?v=2&tid=G-HHL341VPJT&gtm=45je6562v9248621433z89248839776za20gzb9248839776zd9248839776&_p=1778418611275&gcd=13l3l3l2l1l1&npa=1&dma_cps=a&dma=1&are=1&cid=1154166600.1778418612&frm=0&pscdl=noapi&rcb=1&sr=800x600&uaa=x86&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=1&tag_exp=0~115938465~115938469~118463262~118719171&sid=1778418611&sct=1&seg=0&dl=https%3A%2F%2Fbili.works%2F&dt=Bili%20-%20Clarity%20in%20action&en=page_view&_fv=1&_nsi=1&_ss=1&tfd=836region1.google-analytics.com/g/coll... https://region1.google-analytics.com/g/collect?v=2&tid=G-HHL341VPJT&gtm=45je6562v9248621433z89248839776za20gzb9248839776zd9248839776&_p=1778418611275&gcd=13l3l3l2l1l1&npa=1&dma_cps=a&dma=1&are=1&cid=1154166600.1778418612&frm=0&pscdl=noapi&rcb=1&sr=800x600&uaa=x86&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=1&tag_exp=0~115938465~115938469~118463262~118719171&sid=1778418611&sct=1&seg=0&dl=https%3A%2F%2Fbili.works%2F&dt=Bili%20-%20Clarity%20in%20action&en=page_view&_fv=1&_nsi=1&_ss=1&tfd=836 — 204 — 545 B — 52 ms — h2https://queue.simpleanalyticscdn.com/simple.gif?version=cdn_latest_11&hostname=share.deftform.com&ua=Mozilla%2F5.0%20(X11%3B%20Linux%20x86_64)%20AppleWebKit%2F537.36%20(KHTML%2C%20like%20Gecko)%20HeadlessChrome%2F146.0.0.0%20Safari%2F537.36&https=true&timezone=UTC&page_id=b97839eb-043b-4def-8c3b-d9c5a68b45f7&session_id=2502b9b6-9440-4e14-93d0-23abf875ec53&sri=false&mobile=false&brands=%5B%7B%22brand%22%3A%22Not-A.Brand%22%2C%22version%22%3A%2224%22%7D%2C%7B%22brand%22%3A%22Chromium%22%2C%22version%22%3A%22146%22%7D%5D&os_name=Linux&os_version=&path=%2F81e07bb4-0eef-4512-a253-a3af04bed541&viewport_width=1048&viewport_height=150&language=en-US&screen_width=800&screen_height=600&unique=true&id=b97839eb-043b-4def-8c3b-d9c5a68b45f7&type=pageview&referrer=bili.works%2F&time=1778418612140queue.simpleanalyticscdn.com/simple... https://queue.simpleanalyticscdn.com/simple.gif?version=cdn_latest_11&hostname=share.deftform.com&ua=Mozilla%2F5.0%20(X11%3B%20Linux%20x86_64)%20AppleWebKit%2F537.36%20(KHTML%2C%20like%20Gecko)%20HeadlessChrome%2F146.0.0.0%20Safari%2F537.36&https=true&timezone=UTC&page_id=b97839eb-043b-4def-8c3b-d9c5a68b45f7&session_id=2502b9b6-9440-4e14-93d0-23abf875ec53&sri=false&mobile=false&brands=%5B%7B%22brand%22%3A%22Not-A.Brand%22%2C%22version%22%3A%2224%22%7D%2C%7B%22brand%22%3A%22Chromium%22%2C%22version%22%3A%22146%22%7D%5D&os_name=Linux&os_version=&path=%2F81e07bb4-0eef-4512-a253-a3af04bed541&viewport_width=1048&viewport_height=150&language=en-US&screen_width=800&screen_height=600&unique=true&id=b97839eb-043b-4def-8c3b-d9c5a68b45f7&type=pageview&referrer=bili.works%2F&time=1778418612140 — 202 — 255 B — 28 ms — h2https://www.googletagmanager.com/gtag/js?id=G-HHL341VPJT&cx=c&gtm=4e6562www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-HHL341VPJT&cx=c&gtm=4e6562 — 200 — 156.8 KiB — 35 ms — h2https://bili.works/favicon.ico/favicon.ico https://bili.works/favicon.ico — 404 — 5.4 KiB — 10 ms — h2
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
73% of JavaScript execution is third-party
First-party Third-party 517ms · 275KB · $7/mo
Unattributable
Other
Costly
Execution 257ms
Transfer 0 KB
Monthly Cost $3/mo
Google Tag Manager
Tag Manager
Optional
Execution 142ms
Transfer 157 KB
Unused 43%
Monthly Cost $2/mo
Google Tag Manager
Tag Manager
Optional
Execution 118ms
Transfer 119 KB
Unused 55%
Monthly Cost $2/mo

These scripts may cost more than they're worth

  • Unattributable adds 257ms and costs ~$3/month

73% 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.

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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

Unattributable takes 257ms 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 Google Tag Manager'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

Image Optimization
4 images, 627 KB total, 210 KB wasted
INFO

Image Optimization Audit

Total Images

4

Total Size

627 KB

Oversized

3

Wasted

210 KB

4 missing dimensions 2 missing lazy loading
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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