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.
6.44 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
22.46 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
1.83 s
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
1.302
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
14.44 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.
25.66 s
Page Load Progression
664 ms 1.3 s
2.0 s
2.7 s
3.3 s 4.0 s
4.6 s
5.3 sFPage Weight BudgetAction7.4 MB transferred, 203 requestsFIX
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
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.
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
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
CSS bundle is large — purge unused styles (PurgeCSS, Tailwind JIT) to reduce CSS payload.
Source: web.dev
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
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
FJS Execution CostAction14850ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://players.brightcove.net/6057940598001/default_default/index.min.js | 2944ms | 1531ms | 121ms | 3rd |
| Unattributable | 2239ms | 242ms | 0ms | 3rd |
| https://www.christies.com/ | 2128ms | 19ms | 22ms | 3rd |
| https://dsl.assets.christies.com/design-system-library/production/p-aa7006f2.entry.js | 1881ms | 234ms | 1ms | 3rd |
| https://dsl.assets.christies.com/react-legacy-integration/production/latest/index.js | 1322ms | 756ms | 4ms | 3rd |
| https://dsl.assets.christies.com/design-system-library/production/p-3e098f3f.js | 1232ms | 1004ms | 0ms | 3rd |
| https://dsl.assets.christies.com/design-system-library/production/critical.min.js | 759ms | 261ms | 3ms | 3rd |
| https://dsl.assets.christies.com/distribution/production/latest/chunks/MJJGGX4V.js | 396ms | 113ms | 41ms | 3rd |
| https://assets.adobedtm.com/4f105c1434ad/05fddbc767bb/launch-1b477ca5fd6e.min.js | 396ms | 270ms | 106ms | 3rd |
| https://cdn.cookielaw.org/scripttemplates/202603.1.0/otBannerSdk.js | 356ms | 228ms | 78ms | 3rd |
Showing top 10 of 18 scripts
DJS BundlesAction112 scripts, 390 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://players.brightcove.net/6057940598001/default_default/index.min.js | 221 KB | 91 KB (41%) | ✓ | 3rd |
| https://cdn.cookielaw.org/scripttemplates/202603.1.0/otBannerSdk.js | 130 KB | 81 KB (62%) | ✓ | 3rd |
| https://dsl.assets.christies.com/react-legacy-integration/production/latest/index.js | 177 KB | 71 KB (64%) | ✓ | 3rd |
| https://assets.adobedtm.com/4f105c1434ad/05fddbc767bb/launch-1b477ca5fd6e.min.js | 108 KB | 43 KB (40%) | ✓ | 3rd |
| https://dsl.assets.christies.com/distribution/production/latest/chunks/BGJYKAGM.js | 48 KB | 29 KB (61%) | ✓ | 3rd |
| https://www.christies.com/Build/scripts/v3/global-bundle.min.js?hash=-424272072 | 41 KB | 28 KB (69%) | ✓ | 3rd |
| https://dsl.assets.christies.com/design-system-library/production/p-478c20f4.entry.js | 99 KB | 26 KB (26%) | ✓ | 3rd |
| https://code.jquery.com/jquery-3.5.1.min.js | 31 KB | 22 KB (72%) | ✓ | 3rd |
| https://dsl.assets.christies.com/distribution/production/latest/chunks/UVIDYCZG.js | 1 KB | — | ✓ | 3rd |
| https://dsl.assets.christies.com/design-system-library/production/p-3d67d3f7.js | 1 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
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
DPage Weight InventoryAction203 resources · 7.4 MB · 390 KB savings availableFIX
~390.5 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 203 resources | 7.4 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
BImage Optimization48 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 Loading6 fonts (551 KB)PASS
Web fonts
6
551 KB total
Render-blocking
0
of 6
Dominant font-display
swap
Most common across fonts
Font loading timeline
- Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
- Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
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 ~193 KB and ~386 ms
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource HintsNo optimization neededPASS
Network Waterfall203 requests over 5412msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
players.brightcove.net players.brightcove.net | Other | 2944ms | 221 KB | 41% | $39/mo | Costly |
Unattributable Unattributable | Other | 2239ms | 0 KB | — | $30/mo | Costly |
www.christies.com www.christies.com | Other | 2128ms | 35 KB | — | $28/mo | Costly |
dsl.assets.christies.com dsl.assets.christies.com | Other | 1881ms | 11 KB | — | $25/mo | Costly |
dsl.assets.christies.com dsl.assets.christies.com | Other | 1322ms | 177 KB | 64% | $18/mo | Costly |
dsl.assets.christies.com dsl.assets.christies.com | Other | 1232ms | 7 KB | — | $16/mo | Costly |
dsl.assets.christies.com dsl.assets.christies.com | Other | 759ms | 7 KB | — | $10/mo | Costly |
dsl.assets.christies.com dsl.assets.christies.com | Other | 396ms | 24 KB | — | $5/mo | Costly |
assets.adobedtm.com assets.adobedtm.com | Other | 396ms | 108 KB | 40% | $5/mo | Costly |
OneTrust cdn.cookielaw.org | Consent | 356ms | 130 KB | 62% | $5/mo | Essential |
www.christies.com www.christies.com | Other | 283ms | 10 KB | — | $4/mo | Costly |
dsl.assets.christies.com dsl.assets.christies.com | Other | 219ms | 4 KB | — | $3/mo | Costly |
code.jquery.com code.jquery.com | Other | 169ms | 31 KB | 72% | $2/mo | Optional |
dsl.assets.christies.com dsl.assets.christies.com | Other | 158ms | 1 KB | — | $2/mo | Optional |
www.christies.com www.christies.com | Other | 133ms | 41 KB | 69% | $2/mo | Optional |
ar.christies.com ar.christies.com | Other | 127ms | 0 KB | — | $2/mo | Optional |
dsl.assets.christies.com dsl.assets.christies.com | Other | 55ms | 53 KB | — | $1/mo | Optional |
dsl.assets.christies.com dsl.assets.christies.com | Other | 52ms | 48 KB | 61% | $1/mo | Optional |
These scripts may cost more than they're worth
- players.brightcove.net adds 2944ms and costs ~$39/month
- Unattributable adds 2239ms and costs ~$30/month
- www.christies.com adds 2128ms and costs ~$28/month
- dsl.assets.christies.com adds 1881ms and costs ~$25/month
- dsl.assets.christies.com adds 1322ms and costs ~$18/month
- dsl.assets.christies.com adds 1232ms and costs ~$16/month
- dsl.assets.christies.com adds 759ms and costs ~$10/month
- dsl.assets.christies.com adds 396ms and costs ~$5/month
- assets.adobedtm.com adds 396ms and costs ~$5/month
- www.christies.com adds 283ms and costs ~$4/month
- dsl.assets.christies.com adds 219ms 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
players.brightcove.net takes 2944ms 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 2239ms 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.christies.com takes 2128ms 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
dsl.assets.christies.com takes 1881ms 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
dsl.assets.christies.com takes 1322ms 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
64% of dsl.assets.christies.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
dsl.assets.christies.com takes 1232ms 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
dsl.assets.christies.com takes 759ms 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
dsl.assets.christies.com takes 396ms 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
assets.adobedtm.com takes 396ms 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
62% of OneTrust'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.christies.com takes 283ms 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
dsl.assets.christies.com takes 219ms 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
72% of code.jquery.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
69% of www.christies.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
61% of dsl.assets.christies.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