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https://staples.ca

Performance

· 14 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
70
GRADE
C
FIX
5
REVIEW
2
PASS
5
INFO
2

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

Mobile Desktop
31
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
93
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.
85
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.

1.98 s

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

6.13 s

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

934 ms

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

0.037

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

4.41 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.

10.55 s

Page Load Progression

1.1 s
2.2 s
3.3 s
4.4 s
5.5 s
6.7 s
7.8 s
8.9 s
Checks
14
5 PASS 2 REVIEW 5 FIX
F
Page Weight Budget
Action
13.1 MB transferred, 664 requests
FIX
13.1 MB transferred, 664 requests
Critical::
Page weighs 26.9 MB (13.1 MB transferred)
Warning::
Images are 6.3 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 6.3 MB
Warning::
JavaScript is 4.3 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 4.3 MB
Warning::
664 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 2.7 g CO2 per page load
13.1 MB / 2.4 MB budget
13.1 MB transferred
664 requests
2.7 g CO2 per page load
Images 6.3 MiB 49%
JavaScript 4.3 MiB 33%
Other 1.1 MiB 8%
Other 815.2 KiB 6%
CSS 191.5 KiB 1%
Fonts 145.8 KiB 1%
HTML 135.0 KiB 1%
Other 117.7 KiB 1%
Other 11.5 KiB 0%
Other 0 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 (13.1 MiB of 13.1 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
8041ms total JS execution
FIX
8041ms total JS execution
Warning::
https://www.staples.ca/cdn/shop/t/3675/assets/vend...: 2295ms CPU time
Warning::
https://www.staples.ca/cdn/shopifycloud/storefront...: 1686ms CPU time
Warning::
https://www.staples.ca/: 1025ms CPU time
Warning::
Unattributable: 888ms CPU time
Warning::
https://connect.facebook.net/signals/config/175358...: 318ms CPU time
Warning::
Third-party scripts: 8041ms (100% of total)

Main Thread Breakdown

Script Evaluation 63% Other 21% Style & Layout 8%
ScriptTotalScriptingParse/CompileParty
https://www.staples.ca/cdn/shop/t/3675/assets/vendor-b9975e58.min.js2295ms1448ms5ms3rd
https://www.staples.ca/cdn/shopifycloud/storefront/assets/shop_events_listener-3da45d37.js1686ms1539ms0ms3rd
https://www.staples.ca/1025ms69ms47ms3rd
Unattributable888ms32ms0ms3rd
https://connect.facebook.net/signals/config/175358999513349?v=2.9.293&r=stable&domain=www.staples.ca&hme=295b1b33901e14aeab879c0b58f907ef4d5f44fdd19814310771af911c5f6ac8&ex_m=102%2C198%2C147%2C22%2C70%2C71%2C139%2C66%2C65%2C11%2C155%2C88%2C16%2C132%2C124%2C37%2C73%2C76%2C130%2C152%2C157%2C8%2C4%2C5%2C7%2C6%2C3%2C89%2C99%2C158%2C163%2C212%2C60%2C179%2C180%2C53%2C267%2C30%2C72%2C224%2C223%2C222%2C23%2C32%2C101%2C59%2C10%2C61%2C95%2C96%2C97%2C103%2C127%2C31%2C29%2C129%2C126%2C125%2C148%2C74%2C151%2C149%2C150%2C48%2C58%2C120%2C15%2C154%2C43%2C254%2C255%2C253%2C26%2C27%2C28%2C46%2C140%2C75%2C110%2C18%2C20%2C42%2C38%2C40%2C39%2C81%2C90%2C94%2C108%2C138%2C141%2C44%2C109%2C24%2C21%2C116%2C67%2C35%2C143%2C142%2C144%2C135%2C133%2C25%2C34%2C57%2C107%2C153%2C68%2C17%2C145%2C112%2C79%2C64%2C19%2C83%2C84%2C113%2C82%2C33%2C284%2C205%2C194%2C195%2C193%2C287%2C279%2C50%2C206%2C105%2C128%2C78%2C118%2C52%2C45%2C47%2C111%2C117%2C123%2C56%2C62%2C51%2C54%2C98%2C156%2C1%2C121%2C14%2C119%2C12%2C2%2C55%2C91%2C63%2C115%2C87%2C86%2C159%2C160%2C92%2C93%2C9%2C122%2C100%2C49%2C136%2C85%2C77%2C69%2C114%2C104%2C41%2C137%2C0%2C80%2C131%2C134%2C146%2C36%2C106%2C13%2C161318ms301ms5ms3rd
https://www.googletagmanager.com/gtag/js?id=G-JLJQL1E3HP266ms240ms18ms3rd
https://www.gstatic.com/recaptcha/releases/kUYUkUlSyqkjTSMaN2w3RaOh/recaptcha__en.js162ms65ms33ms3rd
https://www.datadoghq-browser-agent.com/datadog-rum-v4.js156ms139ms3ms3rd
https://cdn.segment.com/next-integrations/integrations/vendor/commons.59560acdd69ed701c941.js.gz135ms128ms2ms3rd
https://www.staples.ca/cdn/shopifycloud/storefront/assets/storefront/load_feature-496de5fe.js122ms121ms0ms3rd

Showing top 10 of 24 scripts

F
JS Bundles
Action
169 scripts, 2.1 MB unused
FIX
169 scripts, 2.1 MB unused
Warning::
https://www.staples.ca/cdn/shop/t/3675/assets/vend...: 637 KB unused (61%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.staples.ca/cdn/shop/t/3675/assets/inde...: 179 KB unused (50%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.gstatic.com/recaptcha/releases/kUYUkUl...: 178 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.gstatic.com/recaptcha/releases/kUYUkUl...: 178 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.gstatic.com/recaptcha/releases/kUYUkUl...: 178 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 2.1 MB
2164 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.staples.ca/cdn/shop/t/3675/assets/vendor-b9975e58.min.js1051 KB637 KB (61%)✓3rd
https://www.staples.ca/cdn/shop/t/3675/assets/index-74136704.min.js362 KB179 KB (50%)✓3rd
https://www.gstatic.com/recaptcha/releases/kUYUkUlSyqkjTSMaN2w3RaOh/recaptcha__en.js363 KB178 KB (49%)✓3rd
https://www.gstatic.com/recaptcha/releases/kUYUkUlSyqkjTSMaN2w3RaOh/recaptcha__en.js363 KB178 KB (49%)✓3rd
https://www.gstatic.com/recaptcha/releases/kUYUkUlSyqkjTSMaN2w3RaOh/recaptcha__en.js0 KB178 KB (49%)✓3rd
https://www.gstatic.com/recaptcha/releases/kUYUkUlSyqkjTSMaN2w3RaOh/recaptcha__en.js0 KB178 KB (49%)✓3rd
https://staplesca-esengage.live.exchangesolutions.com/v4/esRd-min.js292 KB146 KB (50%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-JLJQL1E3HP174 KB67 KB (39%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-MVGTRDM&l=dataLayer130 KB67 KB (52%)✓3rd
https://www.googleoptimize.com/optimize.js?id=GTM-KWCVBZP109 KB65 KB (60%)✓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
C
Image Optimization
Action
168 images, 0 KB saveable
REVIEW
168 images, 0 KB saveable
Warning::
https://images.ctfassets.net/2yd1b0rk61ek/4sJuGwwk... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://images.ctfassets.net/2yd1b0rk61ek/33uYOPrN... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://images.ctfassets.net/2yd1b0rk61ek/6Rej5EEV... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://images.ctfassets.net/2yd1b0rk61ek/3P9vh8sI... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://images.ctfassets.net/2yd1b0rk61ek/c1R7mdaG... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://images.ctfassets.net/2yd1b0rk61ek/1XGc3nG2... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://images.ctfassets.net/2yd1b0rk61ek/5zFNSzU0... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://images.ctfassets.net/2yd1b0rk61ek/27cQG5i8... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://images.ctfassets.net/2yd1b0rk61ek/183Cpt3K... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://images.ctfassets.net/2yd1b0rk61ek/XrReukNh... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://images.ctfassets.net/2yd1b0rk61ek/67k7i71q... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://images.ctfassets.net/2yd1b0rk61ek/7LFtZdh3... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://images.ctfassets.net/2yd1b0rk61ek/6KdrDwyN... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://images.ctfassets.net/2yd1b0rk61ek/5CZ9zA0I... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://images.ctfassets.net/2yd1b0rk61ek/10yLQwWB... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://images.ctfassets.net/2yd1b0rk61ek/7aQzfELo... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://images.ctfassets.net/2yd1b0rk61ek/26zfC0Y8... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://images.ctfassets.net/2yd1b0rk61ek/756O6zvx... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://images.ctfassets.net/2yd1b0rk61ek/gNopGekF... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://images.ctfassets.net/2yd1b0rk61ek/2u3WNn19... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://images.ctfassets.net/2yd1b0rk61ek/CyQR5WBk... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://images.ctfassets.net/2yd1b0rk61ek/7zMR7Pmh... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://images.ctfassets.net/2yd1b0rk61ek/3Bama9yJ... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
168 images 6.0 MB
0 oversized -0 KB
32 legacy format
23 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

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

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
8 fonts (146 KB)
PASS
8 fonts (146 KB)
Info::
8 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

8

146 KB total

Render-blocking

0

of 8

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s FCP 2.0 s LCP 6.1 shttps://www.staples.ca/cdn/shop/files/tt_norms_regular-webfont.woff?v=1752852089tt_norms_regular-webfon... https://www.staples.ca/cdn/shop/files/tt_norms_regular-webfont.woff?v=1752852089 — 19.7 KiB — 0 ms — font-display: swaphttps://www.staples.ca/cdn/shop/t/3675/assets/glyphs_15-cbf68f30.ttf?8xtb3aglyphs_15-cbf68f30.ttf https://www.staples.ca/cdn/shop/t/3675/assets/glyphs_15-cbf68f30.ttf?8xtb3a — 10.0 KiB — 0 ms — font-display: swaphttps://www.staples.ca/cdn/shop/files/tt_norms_bold-webfont.woff?v=1752852089tt_norms_bold-webfont.woff https://www.staples.ca/cdn/shop/files/tt_norms_bold-webfont.woff?v=1752852089 — 20.7 KiB — 0 ms — font-display: swaphttps://www.staples.ca/cdn/shop/files/tt_norms_medium-webfont.woff?v=1752852089tt_norms_medium-webfont... https://www.staples.ca/cdn/shop/files/tt_norms_medium-webfont.woff?v=1752852089 — 20.4 KiB — 0 ms — font-display: swaphttps://cdn.shopify.com/s/files/1/0036/4806/1509/files/tt_norms_medium-webfont.wofftt_norms_medium-webfont... https://cdn.shopify.com/s/files/1/0036/4806/1509/files/tt_norms_medium-webfont.woff — 20.5 KiB — 0 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 33.9 KiB — 0 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 0 B — 0 ms — font-display: swaphttps://cdn.shopify.com/s/files/1/0036/4806/1509/files/tt_norms_bold.woff?v=1746799629tt_norms_bold.woff https://cdn.shopify.com/s/files/1/0036/4806/1509/files/tt_norms_bold.woff?v=1746799629 — 20.7 KiB — 0 ms — font-display: swap
tt_norms_regular-webfon... woff swap
Size 20 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
glyphs_15-cbf68f30.ttf ttf swap
Size 10 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
tt_norms_bold-webfont.woff woff swap
Size 21 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
tt_norms_medium-webfont... woff swap
Size 20 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
tt_norms_medium-webfont... woff swap
Size 20 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 34 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 0 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
tt_norms_bold.woff woff swap
Size 21 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
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 ~34 KB and ~68 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
Network Waterfall
664 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
100% of JavaScript execution is third-party
First-party Third-party 8041ms · 2322KB · CA$111/mo
www.staples.ca
Other
Costly
Execution 2295ms
Transfer 1051 KB
Unused 61%
Monthly Cost CA$32/mo
www.staples.ca
Other
Costly
Execution 1686ms
Transfer 4 KB
Monthly Cost CA$23/mo
www.staples.ca
Other
Costly
Execution 1025ms
Transfer 72 KB
Monthly Cost CA$14/mo
Unattributable
Other
Costly
Execution 888ms
Transfer 0 KB
Monthly Cost CA$12/mo
Facebook Pixel
Advertising
Costly
Execution 318ms
Transfer 38 KB
Monthly Cost CA$4/mo
Google Tag Manager
Tag Manager
Costly
Execution 266ms
Transfer 174 KB
Unused 39%
Monthly Cost CA$4/mo
www.gstatic.com
Other
Optional
Execution 162ms
Transfer 0 KB
Unused 49%
Monthly Cost CA$2/mo
www.datadoghq-browser-agent.com
Other
Optional
Execution 156ms
Transfer 48 KB
Unused 59%
Monthly Cost CA$2/mo
Segment
Analytics
Optional
Execution 135ms
Transfer 22 KB
Monthly Cost CA$2/mo
www.staples.ca
Other
Optional
Execution 122ms
Transfer 4 KB
Monthly Cost CA$2/mo
www.staples.ca
Other
Optional
Execution 115ms
Transfer 0 KB
Monthly Cost CA$2/mo
static.klaviyo.com
Other
Optional
Execution 106ms
Transfer 23 KB
Monthly Cost CA$1/mo
cdn-cookieyes.com
Other
Optional
Execution 100ms
Transfer 10 KB
Monthly Cost CA$1/mo
analytics.tiktok.com
Other
Optional
Execution 88ms
Transfer 110 KB
Unused 52%
Monthly Cost CA$1/mo
Google Tag Manager
Tag Manager
Optional
Execution 68ms
Transfer 130 KB
Unused 52%
Monthly Cost CA$1/mo
Facebook Pixel
Advertising
Optional
Execution 64ms
Transfer 95 KB
Unused 34%
Monthly Cost CA$1/mo
static.klaviyo.com
Other
Optional
Execution 64ms
Transfer 8 KB
Monthly Cost CA$1/mo
Segment
Analytics
Optional
Execution 60ms
Transfer 3 KB
Monthly Cost CA$1/mo
www.staples.ca
Other
Optional
Execution 57ms
Transfer 117 KB
Monthly Cost CA$1/mo
www.staples.ca
Other
Optional
Execution 55ms
Transfer 61 KB
Unused 41%
Monthly Cost CA$1/mo
staplesca-esengage.live.exchangesolutions.com
Other
Optional
Execution 55ms
Transfer 292 KB
Unused 50%
Monthly Cost CA$1/mo
www.staples.ca
Other
Optional
Execution 53ms
Transfer 28 KB
Monthly Cost CA$1/mo
apps.bazaarvoice.com
Other
Optional
Execution 53ms
Transfer 2 KB
Monthly Cost CA$1/mo
jsDelivr
CDN
Optional
Execution 50ms
Transfer 32 KB
Monthly Cost CA$1/mo

These scripts may cost more than they're worth

  • www.staples.ca adds 2295ms and costs ~CA$32/month
  • www.staples.ca adds 1686ms and costs ~CA$23/month
  • www.staples.ca adds 1025ms and costs ~CA$14/month
  • Unattributable adds 888ms and costs ~CA$12/month
  • Facebook Pixel adds 318ms and costs ~CA$4/month
  • Google Tag Manager adds 266ms and costs ~CA$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.staples.ca takes 2295ms 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

61% of www.staples.ca'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

www.staples.ca takes 1686ms 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

www.staples.ca takes 1025ms 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 888ms 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

Facebook Pixel takes 318ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

Google Tag Manager takes 266ms 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

59% of www.datadoghq-browser-agent.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

52% of analytics.tiktok.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

52% 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

50% of staplesca-esengage.live.exchangesolutions.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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