Performance
· 15 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.
2.57 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
2.61 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
144 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.000
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
4.31 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.
2.89 s
Page Load Progression
DPage Weight BudgetAction2.3 MB transferred, 73 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
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
DJS Execution CostAction3097ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://web-assets.bcg.com/resource/0000018f-e39d-d615-a5df-f39fa8390000/styleguide/All.min.a100d77209a2ad346263e4047352b5bb.gz.js | 1448ms | 353ms | 93ms | 3rd |
| https://www.bcg.com/ | 833ms | 16ms | 2ms | 3rd |
| https://www.bcg.com/YMK_Az9AlRn0P3kRuMWSfynJdnA/J7kazppXJmXkw0G1L3/QwpAMw/MHcqVRMW/OA8B | 339ms | 299ms | 19ms | 3rd |
| Unattributable | 256ms | 20ms | 0ms | 3rd |
| https://consent.trustarc.com/asset/notice.js/v/v1.7-1729 | 140ms | 75ms | 4ms | 3rd |
| https://assets.adobedtm.com/launch-EN53a6b017d5e242fa81294be51b6efc9b.min.js | 81ms | 58ms | 16ms | 3rd |
FJS BundlesAction21 scripts, 567 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://web-assets.bcg.com/resource/0000018f-e39d-d615-a5df-f39fa8390000/styleguide/All.min.a100d77209a2ad346263e4047352b5bb.gz.js | 674 KB | 505 KB (75%) | ✓ | 3rd |
| https://www.bcg.com/YMK_Az9AlRn0P3kRuMWSfynJdnA/J7kazppXJmXkw0G1L3/QwpAMw/MHcqVRMW/OA8B | 171 KB | 34 KB (20%) | ✓ | 3rd |
| https://assets.adobedtm.com/launch-EN53a6b017d5e242fa81294be51b6efc9b.min.js | 86 KB | 28 KB (33%) | ✓ | 3rd |
| https://web-assets.bcg.com/resource/0000018f-e39d-d615-a5df-f39fa8390000/951.131477e7832af00c8c8c.js | 7 KB | — | ✓ | 3rd |
| https://consent-pref.trustarc.com/defaultpreferencemanager/defaultpreferencemanager.nocache.js?nocache | 7 KB | — | ✓ | 3rd |
| https://assets.adobedtm.com/extensions/EP31dbb9c60e404ba1aa6e746d49be6f29/AppMeasurement_Module_ActivityMap.min.js | 2 KB | — | ✓ | 3rd |
| https://consent.trustarc.com/notice?domain=bcg.com&c=teconsent&text=true&pcookie=true&cdn=1>m=true&js=bb¬iceType=bb&privacypolicylink=https%3A%2F%2Fwww.bcg.com%2Fabout%2Fprivacy-policy%3Fsrc%3Dcmp&cookieLink=https%3A%2F%2Fwww.bcg.com%2Fabout%2Fprivacy-policy%3Fsrc%3Dcmp | 7 KB | — | ✓ | 3rd |
| https://assets.adobedtm.com/27570ec65b69/ad0ea22f24a0/bf1e1cc719af/RC6c4e17cbb7d24cf4b23742cb51952143-source.min.js | 1 KB | — | ✓ | 3rd |
| https://assets.adobedtm.com/27570ec65b69/ad0ea22f24a0/bf1e1cc719af/RCab749e91710b4daf8e986af2b716941b-source.min.js | 1 KB | — | ✓ | 3rd |
| https://web-assets.bcg.com/resource/0000018f-e39d-d615-a5df-f39fa8390000/767.b9b90d6557ee4d53a2cc.js | 6 KB | — | ✓ | 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
FPage Weight InventoryAction73 resources · 2.3 MB · 567 KB savings availableFIX
~567.3 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 73 resources | 2.3 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
BImage Optimization16 images, 0 KB saveableREVIEW
CGreen HostingActionWhether the site is served from green-energy infrastructureREVIEW
Green Hosting
No green hosting detected
A+Text CompressionAll text resources are compressedPASS
A+Font Loading5 fonts (172 KB)PASS
Web fonts
5
172 KB total
Render-blocking
0
of 5
Dominant font-display
swap
Most common across fonts
Font loading timeline
- 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 ~23 KB and ~46 ms
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource HintsNo optimization neededPASS
Network Waterfall73 requests over 3068msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
web-assets.bcg.com web-assets.bcg.com | Other | 1448ms | 674 KB | 75% | €16/mo | Costly |
www.bcg.com www.bcg.com | Other | 833ms | 1 KB | — | €9/mo | Costly |
www.bcg.com www.bcg.com | Other | 339ms | 1 KB | 20% | €4/mo | Costly |
Unattributable Unattributable | Other | 256ms | 0 KB | — | €3/mo | Costly |
consent.trustarc.com consent.trustarc.com | Other | 140ms | 36 KB | — | €2/mo | Optional |
assets.adobedtm.com assets.adobedtm.com | Other | 81ms | 86 KB | 33% | €1/mo | Optional |
These scripts may cost more than they're worth
- web-assets.bcg.com adds 1448ms and costs ~€16/month
- www.bcg.com adds 833ms and costs ~€9/month
- www.bcg.com adds 339ms and costs ~€4/month
- Unattributable adds 256ms and costs ~€3/month
100% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.
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
web-assets.bcg.com takes 1448ms 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
75% of web-assets.bcg.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
www.bcg.com takes 833ms 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
www.bcg.com takes 339ms 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 256ms 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