Performance
· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.Performance-focused optimization plan with CWV assessment, top offenders, and time estimates
First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.
7.16 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
22.38 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
1.51 s
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.005
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
9.36 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.
22.64 s
Page Load Progression
FPage Weight BudgetAction3.3 MB transferred, 129 requestsFIX
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
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.
Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).
Source: web.dev font loading
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.
Source: web.dev
FJS Execution CostAction6531ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://otg.mblycdn.com/pub_macleans.js | 1050ms | 896ms | 85ms | 3rd |
| https://macleans.ca/mac/_next/static/chunks/framework-5757d75364ce2279.js | 956ms | 864ms | 13ms | 1st |
| https://cdn-cookieyes.com/client_data/13b63a368a54920da8ed174d/banner.js | 728ms | 564ms | 15ms | 3rd |
| Unattributable | 696ms | 95ms | 0ms | 3rd |
| https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604170101/pubads_impl.js?cb=31097946 | 544ms | 451ms | 49ms | 3rd |
| https://macleans.ca/ | 472ms | 51ms | 5ms | 1st |
| https://macleans.ca/cdn-cgi/challenge-platform/scripts/jsd/main.js | 323ms | 254ms | 2ms | 1st |
| https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js | 272ms | 171ms | 87ms | 3rd |
| https://macleans.ca/mac/_next/static/chunks/pages/_app-a5f80cb141fa010f.js | 207ms | 150ms | 41ms | 1st |
| https://macleans.ca/mtg1pm/ | 179ms | 139ms | 38ms | 1st |
Showing top 10 of 21 scripts
FJS BundlesAction45 scripts, 878 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js | 362 KB | 220 KB (61%) | ✓ | 3rd |
| https://otg.mblycdn.com/pub_macleans.js | 280 KB | 144 KB (51%) | ✓ | 3rd |
| https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604170101/pubads_impl.js?cb=31097946 | 187 KB | 97 KB (52%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-PFZ4296X>m_auth=>m_preview=>m_cookies_win=x | 131 KB | 85 KB (65%) | ✓ | 3rd |
| https://macleans.ca/mtg1pm/?id=G-PSNJJL83JG&cx=c>m=4e64k1h2 | 167 KB | 72 KB (43%) | ✓ | 1st |
| https://macleans.ca/mac/_next/static/chunks/pages/_app-a5f80cb141fa010f.js | 155 KB | 63 KB (41%) | ✓ | 1st |
| https://macleans.ca/mtg1pm/ | 136 KB | 61 KB (45%) | ✓ | 1st |
| https://macleans.ca/mac/_next/static/chunks/228-dbc7d3df1918cd63.js | 0 KB | 35 KB (82%) | ✓ | 1st |
| https://macleans.ca/mac/_next/static/chunks/228-dbc7d3df1918cd63.js | 17 KB | 35 KB (82%) | ✓ | 1st |
| https://connect.facebook.net/en_US/fbevents.js | 97 KB | 34 KB (35%) | ✓ | 3rd |
Consider code splitting or tree shaking to reduce unused code.
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.
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.
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.
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.
This bundle has high unused code — code-split or tree-shake to ship only what executes.
Source: web.dev / Lighthouse coverage
FPage Weight InventoryAction129 resources · 3.3 MB · 878 KB savings availableFIX
~878.2 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 129 resources | 3.3 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
BThird-Party Impact51% third-party, 0 ms blockingREVIEW
BImage Optimization22 images, 0 KB saveableREVIEW
A+Text CompressionAll text resources are compressedPASS
A+Font Loading8 fonts (263 KB)PASS
Web fonts
8
263 KB total
Render-blocking
0
of 8
Dominant font-display
swap
Most common across fonts
Font loading timeline
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 CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource HintsNo optimization neededPASS
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
A+Green HostingWhether the site is served from green-energy infrastructurePASS
Green Hosting
This site is hosted on green energy infrastructure
Provider: Cloudflare
Network Waterfall129 requests over 3550msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
otg.mblycdn.com otg.mblycdn.com | Other | 1050ms | 280 KB | 51% | CA$15/mo | Costly |
cdn-cookieyes.com cdn-cookieyes.com | Other | 728ms | 39 KB | — | CA$10/mo | Costly |
Unattributable Unattributable | Other | 696ms | 0 KB | — | CA$10/mo | Costly |
securepubads.g.doubleclick.net securepubads.g.doubleclick.net | Other | 544ms | 187 KB | 52% | CA$8/mo | Costly |
www.gstatic.com www.gstatic.com | Other | 272ms | 362 KB | 61% | CA$4/mo | Costly |
s.skimresources.com s.skimresources.com | Other | 167ms | 20 KB | — | CA$2/mo | Optional |
Facebook Pixel connect.facebook.net | Advertising | 127ms | 97 KB | 35% | CA$2/mo | Optional |
Facebook Pixel connect.facebook.net | Advertising | 125ms | 45 KB | — | CA$2/mo | Optional |
securepubads.g.doubleclick.net securepubads.g.doubleclick.net | Other | 78ms | 34 KB | — | CA$1/mo | Optional |
static.chartbeat.com static.chartbeat.com | Other | 78ms | 16 KB | — | CA$1/mo | Optional |
ak.sail-horizon.com ak.sail-horizon.com | Other | 72ms | 48 KB | 70% | CA$1/mo | Optional |
rumcdn.geoedge.be rumcdn.geoedge.be | Other | 62ms | 93 KB | — | CA$1/mo | Optional |
cdn-cookieyes.com cdn-cookieyes.com | Other | 61ms | 12 KB | — | CA$1/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 56ms | 131 KB | 65% | CA$1/mo | Optional |
These scripts may cost more than they're worth
- otg.mblycdn.com adds 1050ms and costs ~CA$15/month
- cdn-cookieyes.com adds 728ms and costs ~CA$10/month
- Unattributable adds 696ms and costs ~CA$10/month
- securepubads.g.doubleclick.net adds 544ms and costs ~CA$8/month
- www.gstatic.com adds 272ms and costs ~CA$4/month
63% of JavaScript execution time comes from third-party scripts.
Third-party scripts (analytics, ads, social, A/B testing) often dominate execution time — every one is a perf-and-privacy tax.
Learn more ▾ ▴
Each third-party script is a black box: you don't control when it loads, what it executes, or how much it grows. They often account for a major share of total blocking time on average sites (HTTP Archive's Web Almanac documents the trend). Audit which ones you actually need, defer the rest, and use facade patterns (lite-youtube, lite-vimeo) for embedded media.
Source: web.dev / HTTP Archive Web Almanac
otg.mblycdn.com takes 1050ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
51% of otg.mblycdn.com's code is unused. The script may be loading features you don't use.
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev
cdn-cookieyes.com takes 728ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
Unattributable takes 696ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
securepubads.g.doubleclick.net takes 544ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
52% of securepubads.g.doubleclick.net's code is unused. The script may be loading features you don't use.
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev
www.gstatic.com takes 272ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
61% of www.gstatic.com's code is unused. The script may be loading features you don't use.
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev
70% of ak.sail-horizon.com's code is unused. The script may be loading features you don't use.
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev
65% of Google Tag Manager's code is unused. The script may be loading features you don't use.
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev