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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
66
GRADE
D
FIX
6
REVIEW
1
PASS
6
INFO
2

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

Mobile Desktop
81
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
87
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.
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.

1.05 s

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

1.92 s

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

166 ms

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

0.038

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

2.20 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.

4.57 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 1 REVIEW 6 FIX
F
Page Weight Budget
Action
5.7 MB transferred, 128 requests
FIX
5.7 MB transferred, 128 requests
Critical::
Page weighs 12.0 MB (5.7 MB transferred)
Warning::
Images are 3.3 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 3.3 MB
Warning::
JavaScript is 1.8 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.8 MB
Warning::
128 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 1.2 g CO2 per page load
5.7 MB / 2.4 MB budget
5.7 MB transferred
128 requests
1.2 g CO2 per page load
Images 3.3 MiB 57%
JavaScript 1.8 MiB 33%
Other 201.4 KiB 3%
HTML 127.2 KiB 2%
Other 102.1 KiB 2%
Fonts 94.5 KiB 2%
CSS 47.8 KiB 1%
Other 4.4 KiB 0%
Other 1006 B 0%
0 2.4 MB 4.9 MB
Over budget

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

Why this matters

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

Source: web.dev

Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.

Why this matters

JavaScript bundle is large — code-split routes and lazy-load off-screen components to defer.

Source: web.dev

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
100% third-party, 0 ms blocking
FIX
100% third-party, 0 ms blocking
Warning::
Third-party code accounts for 100% of page weight (5.7 MiB of 5.7 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Execution Cost
Action
2047ms total JS execution
FIX
2047ms total JS execution
Warning::
https://www.nhl.com/: 512ms CPU time
Warning::
https://assets.nhle.com/nhl_d3_widgets/nhl-widgets...: 487ms CPU time
Warning::
Unattributable: 269ms CPU time
Info::
https://cdn.cookielaw.org/scripttemplates/202510.2...: 230ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-WHL...: 156ms CPU time
Warning::
Third-party scripts: 2047ms (100% of total)

Main Thread Breakdown

Script Evaluation 45% Other 23% Style & Layout 15% Script Parsing & Compilation 8% Rendering 6%
ScriptTotalScriptingParse/CompileParty
https://www.nhl.com/512ms11ms2ms3rd
https://assets.nhle.com/nhl_d3_widgets/nhl-widgets.bundle.js487ms329ms63ms3rd
Unattributable269ms7ms0ms3rd
https://cdn.cookielaw.org/scripttemplates/202510.2.0/otTCF.js230ms210ms2ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-WHLQBZC156ms102ms14ms3rd
https://cdn.cookielaw.org/scripttemplates/202510.2.0/otBannerSdk.js133ms72ms14ms3rd
https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604160201/pubads_impl.js103ms71ms16ms3rd
https://www.nhl.com/assets/js/main.js?_t=bb557764d54d213c72ef926f5efc72e7102ms56ms4ms3rd
https://public.flourish.studio/resources/embed.js55ms16ms1ms3rd
F
JS Bundles
Action
22 scripts, 1.1 MB unused
FIX
22 scripts, 1.1 MB unused
Warning::
https://assets.nhle.com/nhl_d3_widgets/nhl-widgets...: 635 KB unused (69%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://securepubads.g.doubleclick.net/pagead/mana...: 130 KB unused (69%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-W2Z...: 87 KB unused (54%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-WHL...: 60 KB unused (37%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdn.cookielaw.org/scripttemplates/202510.2...: 59 KB unused (47%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 1.1 MB
1080 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://assets.nhle.com/nhl_d3_widgets/nhl-widgets.bundle.js919 KB635 KB (69%)✓3rd
https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604160201/pubads_impl.js188 KB130 KB (69%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-W2ZC4S8F&gtm=4e64h1h1161 KB87 KB (54%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-WHLQBZC164 KB60 KB (37%)✓3rd
https://cdn.cookielaw.org/scripttemplates/202510.2.0/otBannerSdk.js124 KB59 KB (47%)✓3rd
https://www.nhl.com/assets/js/505.js?_t=4b13a5dc50f7ffcd561e121 KB38 KB (32%)✓3rd
https://www.nhl.com/assets/js/main.js?_t=bb557764d54d213c72ef926f5efc72e756 KB38 KB (68%)✓3rd
https://micro.rubiconproject.com/prebid/dynamic/27913.js46 KB33 KB (72%)✓3rd
https://www.nhl.com/assets/js/toggle-container.js?_t=b168a91af2ae90ca7fea2 KB—✓3rd
https://www.nhl.com/assets/js/client-date.js?_t=5c2e4887b6cad6a0533d2 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
128 resources · 5.7 MB · 1.1 MB savings available
FIX
128 resources · 5.7 MB · 1.1 MB savings available
Warning::
Page weight 4.7 MB over 1MB target
Got: 5.7 MB Expected: ≤ 1 MB
Info::
~1.1 MB of savings available
Warning::
127 third-party resources (100% of weight)
Info::
2 resources over 200KB
128 resources · 5.7 MiB · 127 third-party 4.7 MiB over 1MB target
Image 59% · 3.3 MiB
JavaScript 33% · 1.8 MiB
Other 4% · 224.8 KiB
Document 2% · 127.6 KiB
Font 2% · 94.5 KiB
CSS 1% · 52.5 KiB

~1.1 MiB of savings available

Remove unused JavaScript: 1.1 MiB
F
HTTP Caching
Action
No cache headers
FIX
No cache headers
Warning::
No Cache-Control header found
Browsers will use heuristic caching, which can be unpredictable. Set explicit cache headers.

No Cache-Control header

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

C
Image Optimization
Action
70 images, 0 KB saveable
REVIEW
70 images, 0 KB saveable
Warning::
https://assets.nhle.com/logos/nhl/svg/MTL_light.sv... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://assets.nhle.com/logos/nhl/svg/OTT_light.sv... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://assets.nhle.com/logos/nhl/svg/DAL_light.sv... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://assets.nhle.com/logos/nhl/svg/PHI_light.sv... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://assets.nhle.com/logos/nhl/svg/BUF_light.sv... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://assets.nhle.com/logos/nhl/svg/EDM_light.sv... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://assets.nhle.com/logos/nhl/svg/VGK_light.sv... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://assets.nhle.com/logos/nhl/svg/LAK_light.sv... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://assets.nhle.com/logos/nhl/svg/COL_light.sv... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://assets.nhle.com/logos/nhl/svg/TBL_light.sv... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://assets.nhle.com/logos/nhl/svg/BOS_light.sv... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://assets.nhle.com/logos/nhl/svg/UTA_light.sv... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://assets.nhle.com/logos/nhl/svg/MIN_light.sv... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://assets.nhle.com/logos/nhl/svg/ANA_light.sv... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://assets.nhle.com/logos/nhl/svg/PIT_light.sv... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://assets.nhle.com/logos/nhl/svg/CAR_light.sv... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
70 images 3.3 MB
0 oversized -0 KB
55 legacy format
16 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

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

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

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
2 fonts (94 KB)
PASS
2 fonts (94 KB)
Info::
2 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

2

94 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 2.0 s FCP 1.1 s LCP 1.9 shttps://fonts.gstatic.com/s/inter/v20/UcC73FwrK3iLTeHuS_nVMrMxCp50SjIa1ZL7W0Q5nw.woff2UcC73FwrK3iLTeHuS_nVMrM... https://fonts.gstatic.com/s/inter/v20/UcC73FwrK3iLTeHuS_nVMrMxCp50SjIa1ZL7W0Q5nw.woff2 — 47.3 KiB — 39 ms — font-display: swaphttps://fonts.gstatic.com/s/inter/v20/UcC73FwrK3iLTeHuS_nVMrMxCp50SjIa1ZL7.woff2UcC73FwrK3iLTeHuS_nVMrM... https://fonts.gstatic.com/s/inter/v20/UcC73FwrK3iLTeHuS_nVMrMxCp50SjIa1ZL7.woff2 — 47.2 KiB — 67 ms — font-display: swap
UcC73FwrK3iLTeHuS_nVMrM... woff2 swap
Size 47 KB
Load time 39 ms
Start 442 ms
Risk FOUT — text flashes from fallback to web font
UcC73FwrK3iLTeHuS_nVMrM... woff2 swap
Size 47 KB
Load time 67 ms
Start 903 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+
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
128 requests over 2556ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 1.1 s LCP 1.9 shttps://nhl.com// https://nhl.com/ — 301 — 344 B — 183 ms — h2https://www.nhl.com/www.nhl.com/ https://www.nhl.com/ — 200 — 38.7 KiB — 79 ms — h2https://cdn.cookielaw.org/scripttemplates/otSDKStub.jscdn.cookielaw.org/scripttemplates/o... https://cdn.cookielaw.org/scripttemplates/otSDKStub.js — 200 — 9.1 KiB — 71 ms — h2https://securepubads.g.doubleclick.net/tag/js/gpt.jssecurepubads.g.doubleclick.net/tag/... https://securepubads.g.doubleclick.net/tag/js/gpt.js — 200 — 33.7 KiB — 93 ms — h3https://www.nhl.com/assets/js/main.js?_t=bb557764d54d213c72ef926f5efc72e7www.nhl.com/assets/js/main.js?_t=bb... https://www.nhl.com/assets/js/main.js?_t=bb557764d54d213c72ef926f5efc72e7 — 200 — 55.8 KiB — 91 ms — h2https://www.nhl.com/assets/css/base.css?_t=72282d49f33f56cccb86e554e6fc38edwww.nhl.com/assets/css/base.css?_t=... https://www.nhl.com/assets/css/base.css?_t=72282d49f33f56cccb86e554e6fc38ed — 200 — 43.4 KiB — 76 ms — h2https://fonts.googleapis.com/css2?family=Inter:wght@400;700;900&display=swapfonts.googleapis.com/css2?family=In... https://fonts.googleapis.com/css2?family=Inter:wght@400;700;900&display=swap — 200 — 821 B — 90 ms — h2https://fonts.googleapis.com/css2?family=Material+Symbols+Rounded&display=blockfonts.googleapis.com/css2?family=Ma... https://fonts.googleapis.com/css2?family=Material+Symbols+Rounded&display=block — 200 — 920 B — 86 ms — h2https://public.flourish.studio/resources/embed.jspublic.flourish.studio/resources/em... https://public.flourish.studio/resources/embed.js — 200 — 15.3 KiB — 65 ms — h2https://www.nhl.com/manifest.jsonwww.nhl.com/manifest.json https://www.nhl.com/manifest.json — 200 — 1006 B — 176 ms — h2https://cdn.cookielaw.org/consent/d12228cf-ac4f-4972-9ae0-6eb70eba20e8/d12228cf-ac4f-4972-9ae0-6eb70eba20e8.jsoncdn.cookielaw.org/consent/d12228cf-... https://cdn.cookielaw.org/consent/d12228cf-ac4f-4972-9ae0-6eb70eba20e8/d12228cf-ac4f-4972-9ae0-6eb70eba20e8.json — 200 — 2.9 KiB — 78 ms — h2https://static.adsafeprotected.com/iasPET.1.jsstatic.adsafeprotected.com/iasPET.1... https://static.adsafeprotected.com/iasPET.1.js — 200 — 6.6 KiB — 104 ms — h2https://micro.rubiconproject.com/prebid/dynamic/27913.jsmicro.rubiconproject.com/prebid/dyn... https://micro.rubiconproject.com/prebid/dynamic/27913.js — 200 — 46.4 KiB — 46 ms — h2https://media.d3.nhle.com/image/private/t_q-best/prd/assets/nhl/logos/nhl_shield_wm_on_dark_fqkbphmedia.d3.nhle.com/image/private/t_q... https://media.d3.nhle.com/image/private/t_q-best/prd/assets/nhl/logos/nhl_shield_wm_on_dark_fqkbph — 200 — 3.9 KiB — 74 ms — h2https://media.d3.nhle.com/image/private/t_q-best/prd/assets/nhl/logos/nhl_shield_on_dark_kl1omzmedia.d3.nhle.com/image/private/t_q... https://media.d3.nhle.com/image/private/t_q-best/prd/assets/nhl/logos/nhl_shield_on_dark_kl1omz — 200 — 4.0 KiB — 71 ms — h2https://www.googletagmanager.com/gtm.js?id=GTM-WHLQBZCwww.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-WHLQBZC — 200 — 164.0 KiB — 204 ms — h2https://assets.nhle.com/nhl_d3_widgets/nhl-widgets.bundle.jsassets.nhle.com/nhl_d3_widgets/nhl-... https://assets.nhle.com/nhl_d3_widgets/nhl-widgets.bundle.js — 200 — 919.4 KiB — 297 ms — h2https://media.d3.nhle.com/image/private/t_ratio16_9-size50/f_png/v1776777712/prd/xyh7tqxxvmxyyatxyfzj.pngmedia.d3.nhle.com/image/private/t_r... https://media.d3.nhle.com/image/private/t_ratio16_9-size50/f_png/v1776777712/prd/xyh7tqxxvmxyyatxyfzj.png — 200 — 459.8 KiB — 193 ms — h2https://media.d3.nhle.com/image/private/t_ratio16_9-size20/f_png/v1776778133/prd/rgxiywa8c6kq5atbrpgf.pngmedia.d3.nhle.com/image/private/t_r... https://media.d3.nhle.com/image/private/t_ratio16_9-size20/f_png/v1776778133/prd/rgxiywa8c6kq5atbrpgf.png — 200 — 57.9 KiB — 133 ms — h2https://media.d3.nhle.com/image/private/t_ratio16_9-size20/f_auto/v1776722181/prd/kepqfnovrfrugxzlbbnd.jpgmedia.d3.nhle.com/image/private/t_r... https://media.d3.nhle.com/image/private/t_ratio16_9-size20/f_auto/v1776722181/prd/kepqfnovrfrugxzlbbnd.jpg — 200 — 18.6 KiB — 34 ms — h2https://media.d3.nhle.com/image/private/t_ratio16_9-size20/f_png/v1776779366/prd/bkmkdwhy03a8jsa4790p.pngmedia.d3.nhle.com/image/private/t_r... https://media.d3.nhle.com/image/private/t_ratio16_9-size20/f_png/v1776779366/prd/bkmkdwhy03a8jsa4790p.png — 200 — 61.9 KiB — 134 ms — h2https://media.d3.nhle.com/image/private/t_ratio16_9-size20/f_auto/prd/ed4ctq8fpjrtkqe5v6h7.jpgmedia.d3.nhle.com/image/private/t_r... https://media.d3.nhle.com/image/private/t_ratio16_9-size20/f_auto/prd/ed4ctq8fpjrtkqe5v6h7.jpg — 200 — 33.2 KiB — 130 ms — h2https://media.d3.nhle.com/image/private/t_ratio16_9-size20/f_auto/v1776744209/prd/loynvge6klbwp4fsl6sx.jpgmedia.d3.nhle.com/image/private/t_r... https://media.d3.nhle.com/image/private/t_ratio16_9-size20/f_auto/v1776744209/prd/loynvge6klbwp4fsl6sx.jpg — 200 — 21.5 KiB — 129 ms — h2https://media.d3.nhle.com/image/private/t_ratio16_9-size20/f_auto/prd/mp6ngqhg11l0xmhrmlgj.jpgmedia.d3.nhle.com/image/private/t_r... https://media.d3.nhle.com/image/private/t_ratio16_9-size20/f_auto/prd/mp6ngqhg11l0xmhrmlgj.jpg — 200 — 34.1 KiB — 130 ms — h2https://media.d3.nhle.com/image/private/t_ratio16_9-size20/f_auto/prd/f7oxlrbtbumuoss90zod.jpgmedia.d3.nhle.com/image/private/t_r... https://media.d3.nhle.com/image/private/t_ratio16_9-size20/f_auto/prd/f7oxlrbtbumuoss90zod.jpg — 200 — 27.8 KiB — 131 ms — h2https://media.d3.nhle.com/image/private/t_ratio16_9-size20/f_auto/v1776751215/prd/vqyuelvuo5t6omvd9xh6.jpgmedia.d3.nhle.com/image/private/t_r... https://media.d3.nhle.com/image/private/t_ratio16_9-size20/f_auto/v1776751215/prd/vqyuelvuo5t6omvd9xh6.jpg — 200 — 29.6 KiB — 131 ms — h2https://media.d3.nhle.com/image/private/t_ratio16_9-size30/f_png/prd/s1jinwohiignc4scxxsj.pngmedia.d3.nhle.com/image/private/t_r... 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— 1.5 KiB — 57 ms — h2https://assets.nhle.com/logos/nhl/svg/MIN_light.svgassets.nhle.com/logos/nhl/svg/MIN_l... https://assets.nhle.com/logos/nhl/svg/MIN_light.svg — 200 — 2.2 KiB — 35 ms — h2https://assets.nhle.com/logos/nhl/svg/DAL_light.svgassets.nhle.com/logos/nhl/svg/DAL_l... https://assets.nhle.com/logos/nhl/svg/DAL_light.svg — 200 — 2.1 KiB — 47 ms — h2https://assets.nhle.com/logos/nhl/svg/PHI_light.svgassets.nhle.com/logos/nhl/svg/PHI_l... https://assets.nhle.com/logos/nhl/svg/PHI_light.svg — 200 — 1.1 KiB — 58 ms — h2https://assets.nhle.com/logos/nhl/svg/PIT_light.svgassets.nhle.com/logos/nhl/svg/PIT_l... https://assets.nhle.com/logos/nhl/svg/PIT_light.svg — 200 — 4.5 KiB — 42 ms — h2https://assets.nhle.com/logos/nhl/svg/LAK_light.svgassets.nhle.com/logos/nhl/svg/LAK_l... https://assets.nhle.com/logos/nhl/svg/LAK_light.svg — 200 — 14.2 KiB — 42 ms — h2https://assets.nhle.com/logos/nhl/svg/COL_light.svgassets.nhle.com/logos/nhl/svg/COL_l... 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https://assets.nhle.com/mugs/nhl/20252026/CAR/8475883.png — 200 — 145.7 KiB — 44 ms — 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 2047ms · 1523KB · €33/mo
www.nhl.com
Other
Costly
Execution 512ms
Transfer 39 KB
Monthly Cost €8/mo
assets.nhle.com
Other
Costly
Execution 487ms
Transfer 919 KB
Unused 69%
Monthly Cost €8/mo
Unattributable
Other
Costly
Execution 269ms
Transfer 0 KB
Monthly Cost €4/mo
OneTrust
Consent
Essential
Execution 230ms
Transfer 18 KB
Monthly Cost €4/mo
Google Tag Manager
Tag Manager
Optional
Execution 156ms
Transfer 164 KB
Unused 37%
Monthly Cost €2/mo
OneTrust
Consent
Essential
Execution 133ms
Transfer 124 KB
Unused 47%
Monthly Cost €2/mo
securepubads.g.doubleclick.net
Other
Optional
Execution 103ms
Transfer 188 KB
Unused 69%
Monthly Cost €2/mo
www.nhl.com
Other
Optional
Execution 102ms
Transfer 56 KB
Unused 68%
Monthly Cost €2/mo
public.flourish.studio
Other
Optional
Execution 55ms
Transfer 15 KB
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • www.nhl.com adds 512ms and costs ~€8/month
  • assets.nhle.com adds 487ms and costs ~€8/month
  • Unattributable adds 269ms and costs ~€4/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.nhl.com takes 512ms 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.nhle.com takes 487ms 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

69% of assets.nhle.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

Unattributable takes 269ms 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

69% of securepubads.g.doubleclick.net'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 www.nhl.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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