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https://petmd.com

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
74
GRADE
C
FIX
4
REVIEW
3
PASS
6
INFO
2

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

Mobile Desktop
73
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
94
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
77
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
92
SEO Measures basic SEO optimizations: meta tags, crawlability, link text, and mobile friendliness.

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

1.31 s

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

2.75 s

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

14 ms

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

0.143

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

1.97 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.

4.50 s

Page Load Progression

375 ms
750 ms
1.1 s
1.5 s
1.9 s
2.2 s
2.6 s
3.0 s
Checks
15
6 PASS 3 REVIEW 4 FIX
F
Page Weight Budget
Action
3.0 MB transferred, 96 requests
FIX
3.0 MB transferred, 96 requests
Warning::
Page weighs 18.2 MB (3.0 MB transferred)
Warning::
JavaScript is 1.7 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.7 MB
Info::
CSS is 603 KB — consider purging unused styles
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
Got: 603 KB
Info::
Fonts are 340 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 340 KB
Info::
96 HTTP requests
Info::
Estimated 0.63 g CO2 per page load
3.0 MB / 2.4 MB budget
3.0 MB transferred
96 requests
0.63 g CO2 per page load
JavaScript 1.7 MiB 58%
CSS 603.4 KiB 20%
Fonts 339.7 KiB 11%
Images 249.6 KiB 8%
Other 53.3 KiB 2%
HTML 28.8 KiB 1%
Other 3.9 KiB 0%
Other 3.4 KiB 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

Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.

Why this matters

CSS bundle is large — purge unused styles (PurgeCSS, Tailwind JIT) to reduce CSS payload.

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
100% third-party, 0 ms blocking
FIX
100% third-party, 0 ms blocking
Warning::
Third-party code accounts for 100% of page weight (3.0 MiB of 3.0 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Bundles
Action
30 scripts, 452 KB unused
FIX
30 scripts, 452 KB unused
Warning::
https://www.petmd.com/_next/static/chunks/pages/_a...: 104 KB unused (28%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-2X9E...: 72 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-MXD...: 62 KB unused (44%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.petmd.com/_next/static/chunks/pages/%5...: 56 KB unused (10%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://js-cdn.dynatrace.com/jstag/1624d0f62e6/bf2...: 49 KB unused (45%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 452 KB
452 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.petmd.com/_next/static/chunks/pages/_app-0942a6a8fe438b27.js369 KB104 KB (28%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-2X9EJY3CJS&cx=c&gtm=4e64k1h1173 KB72 KB (41%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-MXD7M9K&gtm_auth=&gtm_preview=&gtm_cookies_win=x141 KB62 KB (44%)✓3rd
https://www.petmd.com/_next/static/chunks/pages/%5B%5B...path%5D%5D-bd073354cb97a85d.js557 KB56 KB (10%)✓3rd
https://js-cdn.dynatrace.com/jstag/1624d0f62e6/bf20861wzf/cb0f83072f3ae16b_complete.js110 KB49 KB (45%)✓3rd
https://www.petmd.com/_next/static/chunks/main-6b3d470cb1a46046.js53 KB49 KB (92%)✓3rd
https://s.go-mpulse.net/boomerang/X8M7X-KLATY-ZBTJZ-9DMEL-VGPEV57 KB37 KB (65%)✓3rd
https://www.petmd.com/_next/static/chunks/106.1cfec9859497f3cb.js24 KB23 KB (95%)✓3rd
https://www.petmd.com/_next/static/chunks/__federation_expose_next__router.184f8c9686a234b2.js23 KB—✓3rd
https://cdn.segment.com/analytics-next/bundles/ajs-destination.bundle.8e6b895db75187c55313.js3 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
96 resources · 3.0 MB · 452 KB savings available
FIX
96 resources · 3.0 MB · 452 KB savings available
Warning::
Page weight 2.0 MB over 1MB target
Got: 3.0 MB Expected: ≤ 1 MB
Info::
~452 KB of savings available
Warning::
95 third-party resources (100% of weight)
Info::
3 resources over 200KB
96 resources · 3.0 MiB · 95 third-party 2.0 MiB over 1MB target
JavaScript 58% · 1.7 MiB
CSS 20% · 603.4 KiB
Font 11% · 339.7 KiB
Image 8% · 252.7 KiB
Other 2% · 57.5 KiB
Document 1% · 28.8 KiB

~452.2 KiB of savings available

Remove unused JavaScript: 452.2 KiB
C
JS Execution Cost
Action
1140ms total JS execution
REVIEW
1140ms total JS execution
Warning::
https://www.chewy.com/api/efproc/v3/uMeW0WfnyLJmtF...: 263ms CPU time
Warning::
Unattributable: 251ms CPU time
Info::
https://www.petmd.com/: 162ms CPU time
Info::
https://www.petmd.com/_next/static/chunks/__federa...: 144ms CPU time
Info::
https://www.petmd.com/_next/static/chunks/338.69c9...: 87ms CPU time
Warning::
Third-party scripts: 1140ms (100% of total)

Main Thread Breakdown

Script Evaluation 55% Other 20% Script Parsing & Compilation 10% Style & Layout 8% Parse HTML & CSS 3%
ScriptTotalScriptingParse/CompileParty
https://www.chewy.com/api/efproc/v3/uMeW0WfnyLJmtFjTtKZv/loader_v3.9.6.js263ms223ms3ms3rd
Unattributable251ms19ms0ms3rd
https://www.petmd.com/162ms12ms1ms3rd
https://www.petmd.com/_next/static/chunks/__federation_expose_react_dom.57bd4d2571ede4d5.js144ms129ms2ms3rd
https://www.petmd.com/_next/static/chunks/338.69c9b85f995402bf.js87ms87ms0ms3rd
https://www.googletagmanager.com/gtag/js?id=G-2X9EJY3CJS&cx=c&gtm=4e64k1h164ms54ms9ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-MXD7M9K&gtm_auth=&gtm_preview=&gtm_cookies_win=x58ms49ms8ms3rd
https://js-cdn.dynatrace.com/jstag/1624d0f62e6/bf20861wzf/cb0f83072f3ae16b_complete.js56ms41ms6ms3rd
https://www.petmd.com/_next/static/chunks/pages/%5B%5B...path%5D%5D-bd073354cb97a85d.js55ms2ms53ms3rd
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

B
HTTP Caching
max-age=0
REVIEW
max-age=0
Info::
Cache-Control header is set
Got: max-age=0
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

max-age=0

DirectiveValueMeaning
max-age0Cache for 0 seconds
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+
Image Optimization
17 images, 0 KB saveable
PASS
17 images, 0 KB saveable
Info::
All images are well-optimized
17 images 250 KB
0 oversized -0 KB
0 legacy format
0 missing dimensions CLS risk
A+
Font Loading
12 fonts (340 KB)
PASS
12 fonts (340 KB)
Info::
12 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

12

340 KB total

Render-blocking

0

of 12

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 1.3 s LCP 2.7 shttps://static.chewy.com/lib/dft/latest/fonts/canela/CanelaDeck-Medium-Web.woff2CanelaDeck-Medium-Web.w... https://static.chewy.com/lib/dft/latest/fonts/canela/CanelaDeck-Medium-Web.woff2 — 34.8 KiB — 77 ms — font-display: swaphttps://static.chewy.com/lib/dft/latest/fonts/gordita/Gordita-bold-subset.woff2Gordita-bold-subset.woff2 https://static.chewy.com/lib/dft/latest/fonts/gordita/Gordita-bold-subset.woff2 — 24.4 KiB — 92 ms — font-display: swaphttps://www.petmd.com/fonts/canela/CanelaDeck-Medium-Web.woff2CanelaDeck-Medium-Web.w... https://www.petmd.com/fonts/canela/CanelaDeck-Medium-Web.woff2 — 35.2 KiB — 45 ms — font-display: swaphttps://www.petmd.com/fonts/gordita/Gordita-bold-subset.woff2Gordita-bold-subset.woff2 https://www.petmd.com/fonts/gordita/Gordita-bold-subset.woff2 — 27.6 KiB — 47 ms — font-display: swaphttps://static.chewy.com/lib/dft/latest/fonts/gordita/Gordita-regular-subset.woff2Gordita-regular-subset.... https://static.chewy.com/lib/dft/latest/fonts/gordita/Gordita-regular-subset.woff2 — 24.0 KiB — 88 ms — font-display: swaphttps://www.petmd.com/fonts/canela/CanelaText-Medium-Web.woff2CanelaText-Medium-Web.w... https://www.petmd.com/fonts/canela/CanelaText-Medium-Web.woff2 — 45.0 KiB — 53 ms — font-display: swaphttps://static.chewy.com/lib/dft/latest/fonts/gordita/Gordita-medium-subset.woff2Gordita-medium-subset.w... https://static.chewy.com/lib/dft/latest/fonts/gordita/Gordita-medium-subset.woff2 — 24.6 KiB — 90 ms — font-display: swaphttps://www.petmd.com/fonts/gordita/Gordita-regular-subset.woff2Gordita-regular-subset.... https://www.petmd.com/fonts/gordita/Gordita-regular-subset.woff2 — 27.0 KiB — 57 ms — font-display: swaphttps://static.chewy.com/lib/dft/latest/fonts/gordita/gordita-regular-webfont.woff2gordita-regular-webfont... https://static.chewy.com/lib/dft/latest/fonts/gordita/gordita-regular-webfont.woff2 — 24.0 KiB — 17 ms — font-display: swaphttps://static.chewy.com/lib/dft/latest/fonts/gordita/gordita-medium-webfont.woff2gordita-medium-webfont.... https://static.chewy.com/lib/dft/latest/fonts/gordita/gordita-medium-webfont.woff2 — 24.6 KiB — 18 ms — font-display: swaphttps://static.chewy.com/lib/dft/latest/fonts/gordita/gordita-bold-webfont.woff2gordita-bold-webfont.woff2 https://static.chewy.com/lib/dft/latest/fonts/gordita/gordita-bold-webfont.woff2 — 24.3 KiB — 19 ms — font-display: swaphttps://static.chewy.com/lib/dft/latest/fonts/gordita/gordita-light-webfont.woff2gordita-light-webfont.w... https://static.chewy.com/lib/dft/latest/fonts/gordita/gordita-light-webfont.woff2 — 24.3 KiB — 20 ms — font-display: swap
CanelaDeck-Medium-Web.w... woff2 swap
Size 35 KB
Load time 77 ms
Start 280 ms
Risk FOUT — text flashes from fallback to web font
Gordita-bold-subset.woff2 woff2 swap
Size 24 KB
Load time 92 ms
Start 280 ms
Risk FOUT — text flashes from fallback to web font
CanelaDeck-Medium-Web.w... woff2 swap
Size 35 KB
Load time 45 ms
Start 280 ms
Risk FOUT — text flashes from fallback to web font
Gordita-bold-subset.woff2 woff2 swap
Size 28 KB
Load time 47 ms
Start 281 ms
Risk FOUT — text flashes from fallback to web font
Gordita-regular-subset.... woff2 swap
Size 24 KB
Load time 88 ms
Start 281 ms
Risk FOUT — text flashes from fallback to web font
CanelaText-Medium-Web.w... woff2 swap
Size 45 KB
Load time 53 ms
Start 281 ms
Risk FOUT — text flashes from fallback to web font
Gordita-medium-subset.w... woff2 swap
Size 25 KB
Load time 90 ms
Start 281 ms
Risk FOUT — text flashes from fallback to web font
Gordita-regular-subset.... woff2 swap
Size 27 KB
Load time 57 ms
Start 281 ms
Risk FOUT — text flashes from fallback to web font
gordita-regular-webfont... woff2 swap
Size 24 KB
Load time 17 ms
Start 568 ms
Risk FOUT — text flashes from fallback to web font
gordita-medium-webfont.... woff2 swap
Size 25 KB
Load time 18 ms
Start 569 ms
Risk FOUT — text flashes from fallback to web font
gordita-bold-webfont.woff2 woff2 swap
Size 24 KB
Load time 19 ms
Start 569 ms
Risk FOUT — text flashes from fallback to web font
gordita-light-webfont.w... woff2 swap
Size 24 KB
Load time 20 ms
Start 569 ms
Risk FOUT — text flashes from fallback to web font
Optimization checklist
  • Preload critical fonts (priority=high)
  • Use woff2 format for all fonts
  • Set font-display to swap, optional, or fallback
  • Subset large fonts (≤100 KB each)
A+
Resource Caching
All resources properly cached
PASS
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+
Critical Rendering Path
No render-blocking resources
PASS
No render-blocking resources
Info::
No render-blocking resources detected
A+
Resource Hints
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
Network Waterfall
96 requests over 5124ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s FCP 1.3 s LCP 2.7 shttps://petmd.com// https://petmd.com/ — 301 — 799 B — 175 ms — h2https://www.petmd.com/www.petmd.com/ https://www.petmd.com/ — 200 — 28.8 KiB — 96 ms — h2https://static.chewy.com/lib/dft/latest/fonts/canela/CanelaDeck-Medium-Web.woff2static.chewy.com/lib/dft/latest/fon... https://static.chewy.com/lib/dft/latest/fonts/canela/CanelaDeck-Medium-Web.woff2 — 200 — 34.8 KiB — 77 ms — h2https://static.chewy.com/lib/dft/latest/fonts/gordita/Gordita-bold-subset.woff2static.chewy.com/lib/dft/latest/fon... https://static.chewy.com/lib/dft/latest/fonts/gordita/Gordita-bold-subset.woff2 — 200 — 24.4 KiB — 92 ms — h2https://www.petmd.com/fonts/canela/CanelaDeck-Medium-Web.woff2www.petmd.com/fonts/canela/CanelaDe... https://www.petmd.com/fonts/canela/CanelaDeck-Medium-Web.woff2 — 200 — 35.2 KiB — 45 ms — h2https://www.petmd.com/fonts/gordita/Gordita-bold-subset.woff2www.petmd.com/fonts/gordita/Gordita... https://www.petmd.com/fonts/gordita/Gordita-bold-subset.woff2 — 200 — 27.6 KiB — 47 ms — h2https://static.chewy.com/lib/dft/latest/fonts/gordita/Gordita-regular-subset.woff2static.chewy.com/lib/dft/latest/fon... https://static.chewy.com/lib/dft/latest/fonts/gordita/Gordita-regular-subset.woff2 — 200 — 24.0 KiB — 88 ms — h2https://www.petmd.com/fonts/canela/CanelaText-Medium-Web.woff2www.petmd.com/fonts/canela/CanelaTe... https://www.petmd.com/fonts/canela/CanelaText-Medium-Web.woff2 — 200 — 45.0 KiB — 53 ms — h2https://static.chewy.com/lib/dft/latest/fonts/gordita/Gordita-medium-subset.woff2static.chewy.com/lib/dft/latest/fon... https://static.chewy.com/lib/dft/latest/fonts/gordita/Gordita-medium-subset.woff2 — 200 — 24.6 KiB — 90 ms — h2https://www.petmd.com/fonts/gordita/Gordita-regular-subset.woff2www.petmd.com/fonts/gordita/Gordita... https://www.petmd.com/fonts/gordita/Gordita-regular-subset.woff2 — 200 — 27.0 KiB — 57 ms — h2https://www.petmd.com/fonts/font-canela.css?v=1www.petmd.com/fonts/font-canela.css... https://www.petmd.com/fonts/font-canela.css?v=1 — 200 — 1.6 KiB — 169 ms — h2https://www.petmd.com/fonts/font-gordita.csswww.petmd.com/fonts/font-gordita.cs... https://www.petmd.com/fonts/font-gordita.css — 200 — 1.4 KiB — 30 ms — h2https://static.chewy.com/lib/dft/latest/fonts/fonts-chirp.cssstatic.chewy.com/lib/dft/latest/fon... https://static.chewy.com/lib/dft/latest/fonts/fonts-chirp.css — 200 — 1.6 KiB — 89 ms — h2https://static.chewy.com/lib/cds/kib-normalize/latest/styles/theme-base-light.cssstatic.chewy.com/lib/cds/kib-normal... https://static.chewy.com/lib/cds/kib-normalize/latest/styles/theme-base-light.css — 200 — 18.5 KiB — 113 ms — h2https://static.chewy.com/lib/cds/kib-normalize/latest/styles/theme-experiments.cssstatic.chewy.com/lib/cds/kib-normal... https://static.chewy.com/lib/cds/kib-normalize/latest/styles/theme-experiments.css — 200 — 626 B — 110 ms — h2https://static.chewy.com/lib/cds/kib-normalize/latest/styles/theme-petmd.cssstatic.chewy.com/lib/cds/kib-normal... https://static.chewy.com/lib/cds/kib-normalize/latest/styles/theme-petmd.css — 200 — 18.6 KiB — 113 ms — h2https://static.chewy.com/lib/cds/kib-normalize/latest/styles/theme-gordita-2025-embed.cssstatic.chewy.com/lib/cds/kib-normal... https://static.chewy.com/lib/cds/kib-normalize/latest/styles/theme-gordita-2025-embed.css — 200 — 488 B — 112 ms — h2https://www.petmd.com/_next/static/css/0ceff91372e703f9.csswww.petmd.com/_next/static/css/0cef... https://www.petmd.com/_next/static/css/0ceff91372e703f9.css — 200 — 176.4 KiB — 35 ms — h2https://www.petmd.com/_next/static/css/508207be1f6223d7.csswww.petmd.com/_next/static/css/5082... https://www.petmd.com/_next/static/css/508207be1f6223d7.css — 200 — 377.5 KiB — 60 ms — h2https://pet-health-content-media.chewy.com/wp-content/uploads/2026/04/15143807/dogwalingbanner.png?w=1920&q=75pet-health-content-media.chewy.com/... https://pet-health-content-media.chewy.com/wp-content/uploads/2026/04/15143807/dogwalingbanner.png?w=1920&q=75 — 200 — 62.3 KiB — 139 ms — h2https://www.petmd.com/_next/static/chunks/webpack-31a291a6d308a99b.jswww.petmd.com/_next/static/chunks/w... https://www.petmd.com/_next/static/chunks/webpack-31a291a6d308a99b.js — 200 — 26.3 KiB — 19 ms — h3https://www.petmd.com/_next/static/chunks/main-6b3d470cb1a46046.jswww.petmd.com/_next/static/chunks/m... https://www.petmd.com/_next/static/chunks/main-6b3d470cb1a46046.js — 200 — 53.1 KiB — 18 ms — h3https://www.petmd.com/_next/static/chunks/pages/_app-0942a6a8fe438b27.jswww.petmd.com/_next/static/chunks/p... https://www.petmd.com/_next/static/chunks/pages/_app-0942a6a8fe438b27.js — 200 — 368.5 KiB — 79 ms — h3https://s.go-mpulse.net/boomerang/X8M7X-KLATY-ZBTJZ-9DMEL-VGPEVs.go-mpulse.net/boomerang/X8M7X-KLA... https://s.go-mpulse.net/boomerang/X8M7X-KLATY-ZBTJZ-9DMEL-VGPEV — 200 — 56.8 KiB — 57 ms — 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ms — h2https://www.petmd.com/_next/data/OK6NxpYYhpal0WJQ7eJTN/en.jsonwww.petmd.com/_next/data/OK6NxpYYhp... https://www.petmd.com/_next/data/OK6NxpYYhpal0WJQ7eJTN/en.json — 200 — 5.6 KiB — 125 ms — h3https://www.petmd.com/_next/data/OK6NxpYYhpal0WJQ7eJTN/en/dog/general-health/dog-walking-tips-how-to-walk-your-dog.json?path=dog&path=general-health&path=dog-walking-tips-how-to-walk-your-dogwww.petmd.com/_next/data/OK6NxpYYhp... https://www.petmd.com/_next/data/OK6NxpYYhpal0WJQ7eJTN/en/dog/general-health/dog-walking-tips-how-to-walk-your-dog.json?path=dog&path=general-health&path=dog-walking-tips-how-to-walk-your-dog — 200 — 9.7 KiB — 141 ms — h3https://www.petmd.com/_next/data/OK6NxpYYhpal0WJQ7eJTN/en/cat/behavior/why-do-cats-bring-you-gifts.json?path=cat&path=behavior&path=why-do-cats-bring-you-giftswww.petmd.com/_next/data/OK6NxpYYhp... https://www.petmd.com/_next/data/OK6NxpYYhpal0WJQ7eJTN/en/cat/behavior/why-do-cats-bring-you-gifts.json?path=cat&path=behavior&path=why-do-cats-bring-you-gifts — 200 — 8.0 KiB — 132 ms — h3https://www.petmd.com/_next/data/OK6NxpYYhpal0WJQ7eJTN/en/dog/general-health/best-hiking-gear-for-dogs.json?path=dog&path=general-health&path=best-hiking-gear-for-dogswww.petmd.com/_next/data/OK6NxpYYhp... https://www.petmd.com/_next/data/OK6NxpYYhpal0WJQ7eJTN/en/dog/general-health/best-hiking-gear-for-dogs.json?path=dog&path=general-health&path=best-hiking-gear-for-dogs — 200 — 13.2 KiB — 121 ms — h3https://www.petmd.com/_next/data/OK6NxpYYhpal0WJQ7eJTN/en/horse/how-introduce-your-horse-grass.json?path=horse&path=how-introduce-your-horse-grasswww.petmd.com/_next/data/OK6NxpYYhp... https://www.petmd.com/_next/data/OK6NxpYYhpal0WJQ7eJTN/en/horse/how-introduce-your-horse-grass.json?path=horse&path=how-introduce-your-horse-grass — 200 — 8.7 KiB — 119 ms — 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https://region1.google-analytics.com/g/collect?v=2&tid=G-2X9EJY3CJS&gtm=45je64k1h1v9104581304z876093581za20gzb76093581zd76093581&_p=1776896844586&gcd=13l3lPl2l1l1&npa=1&dma_cps=a&dma=1&are=1&cid=1236033230.1776896845&frm=0&pscdl=noapi&rcb=19&sr=800x600&uaa=x86&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=1&tag_exp=0~115938466~115938468~117266400~117512542&sid=1776896844&sct=1&seg=0&dl=https%3A%2F%2Fwww.petmd.com%2F&dt=The%20Best%20Pet%20Health%20%26%20Care%20Advice%20from%20Real%20Vets%20%7C%20PetMD&en=page_view&_fv=1&_nsi=1&_ss=1&tfd=1547 — 204 — 548 B — 83 ms — 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https://stats.g.doubleclick.net/j/collect?t=dc&aip=1&_r=3&v=1&_v=j102&tid=UA-5188865-1&cid=1236033230.1776896845&jid=383874800&gjid=1772566309&_gid=36621749.1776896845&npa=1&_u=YCDAgEABAAAAAGAAI~&z=1314264073 — 200 — 649 B — 85 ms — h2https://www.google-analytics.com/j/collect?v=1&_v=j102&a=574488114&t=pageview&_s=1&dl=https%3A%2F%2Fwww.petmd.com%2F&ul=en-us&dt=The%20Best%20Pet%20Health%20%26%20Care%20Advice%20from%20Real%20Vets%20%7C%20PetMD&sr=800x600&vp=1350x940&_u=YCDACEABBAAAAGAAI~&jid=735106530&gjid=735749274&cid=1236033230.1776896845&tid=UA-23355215-27&_gid=36621749.1776896845&_r=1&_slc=1&gtm=45He64k1h1n81MXD7M9Kv76093581za200zd76093581&gcd=13l3l3l2l1l1&dma_cps=a&dma=1&tag_exp=0~115938466~115938468~117266401~117384405~117971174&npa=1&z=1800892339www.google-analytics.com/j/collect?... https://www.google-analytics.com/j/collect?v=1&_v=j102&a=574488114&t=pageview&_s=1&dl=https%3A%2F%2Fwww.petmd.com%2F&ul=en-us&dt=The%20Best%20Pet%20Health%20%26%20Care%20Advice%20from%20Real%20Vets%20%7C%20PetMD&sr=800x600&vp=1350x940&_u=YCDACEABBAAAAGAAI~&jid=735106530&gjid=735749274&cid=1236033230.1776896845&tid=UA-23355215-27&_gid=36621749.1776896845&_r=1&_slc=1&gtm=45He64k1h1n81MXD7M9Kv76093581za200zd76093581&gcd=13l3l3l2l1l1&dma_cps=a&dma=1&tag_exp=0~115938466~115938468~117266401~117384405~117971174&npa=1&z=1800892339 — 200 — 71 B — 29 ms — h2https://www.petmd.com/akam/13/pixel_6380c182www.petmd.com/akam/13/pixel_6380c18... https://www.petmd.com/akam/13/pixel_6380c182 — 200 — 25 B — 13 ms — h3https://www.chewy.com/api/efproa/7cH8APx/D_mlT/aEqZ/IVumRAp/T?q=uMeW0WfnyLJmtFjTtKZvwww.chewy.com/api/efproa/7cH8APx/D_... https://www.chewy.com/api/efproa/7cH8APx/D_mlT/aEqZ/IVumRAp/T?q=uMeW0WfnyLJmtFjTtKZv — 200 — 1.6 KiB — 141 ms — 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https://bf20861wzf.bf.dynatrace.com/bf?type=js3&sn=v_4_srv_-2D303_sn_7HTAVOC6Q634QUI10HR6LKKV75P9UVMH&svrid=-303&flavor=cors&vi=CRIITAFKCHCEMQDESBRAIFDCFOHUAUHB-0&modifiedSince=1776709022267&bp=3&app=cb0f83072f3ae16b&crc=3913015053&en=gfsbom3g&end=1 — 200 — 382 B — 296 ms — h2https://api.segment.io/v1/tapi.segment.io/v1/t https://api.segment.io/v1/t — 200 — 172 B — 538 ms — h2https://api.segment.io/v1/papi.segment.io/v1/p https://api.segment.io/v1/p — 200 — 173 B — 535 ms — h2https://bf20861wzf.bf.dynatrace.com/bf?type=js3&sn=v_4_srv_10_sn_7HTAVOC6Q634QUI10HR6LKKV75P9UVMH_app-3Acb0f83072f3ae16b_1_ol_0_perc_100000_mul_1_rcs-3Acss_0&svrid=10&flavor=cors&vi=CRIITAFKCHCEMQDESBRAIFDCFOHUAUHB-0&modifiedSince=1776709022267&bp=3&app=cb0f83072f3ae16b&crc=1438147575&en=gfsbom3g&end=1bf20861wzf.bf.dynatrace.com/bf?type... 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h2
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
100% of JavaScript execution is third-party
First-party Third-party 1140ms · 1118KB · $15/mo
www.chewy.com
Other
Costly
Execution 263ms
Transfer 66 KB
Monthly Cost $3/mo
Unattributable
Other
Costly
Execution 251ms
Transfer 0 KB
Monthly Cost $3/mo
www.petmd.com
Other
Optional
Execution 162ms
Transfer 29 KB
Monthly Cost $2/mo
www.petmd.com
Other
Optional
Execution 144ms
Transfer 42 KB
Monthly Cost $2/mo
www.petmd.com
Other
Optional
Execution 87ms
Transfer 0 KB
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 64ms
Transfer 173 KB
Unused 41%
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 58ms
Transfer 141 KB
Unused 44%
Monthly Cost $1/mo
js-cdn.dynatrace.com
Other
Optional
Execution 56ms
Transfer 110 KB
Unused 45%
Monthly Cost $1/mo
www.petmd.com
Other
Optional
Execution 55ms
Transfer 557 KB
Unused 10%
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • www.chewy.com adds 263ms and costs ~$3/month
  • Unattributable adds 251ms and costs ~$3/month

100% 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

www.chewy.com takes 263ms 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 251ms 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

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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