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.
1.30 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
2.90 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
123 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.771
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
4.13 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.
4.26 s
Page Load Progression
849 ms
1.7 s
2.5 s
3.4 s
4.2 s
5.1 s
5.9 s
6.8 sFPage Weight BudgetAction9.6 MB transferred, 209 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
DJS Execution CostAction3333ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://players.brightcove.net/6057940598001/default_default/index.min.js | 866ms | 469ms | 30ms | 3rd |
| Unattributable | 556ms | 59ms | 0ms | 3rd |
| https://www.christies.com/ | 419ms | 6ms | 7ms | 3rd |
| https://dsl.assets.christies.com/design-system-library/production/p-3e098f3f.js | 294ms | 249ms | 0ms | 3rd |
| https://dsl.assets.christies.com/react-legacy-integration/production/latest/index.js | 251ms | 143ms | 1ms | 3rd |
| https://dsl.assets.christies.com/design-system-library/production/critical.min.js | 240ms | 95ms | 1ms | 3rd |
| https://dsl.assets.christies.com/design-system-library/production/p-aa7006f2.entry.js | 186ms | 24ms | 0ms | 3rd |
| https://assets.adobedtm.com/4f105c1434ad/05fddbc767bb/launch-1b477ca5fd6e.min.js | 123ms | 98ms | 18ms | 3rd |
| https://dsl.assets.christies.com/distribution/production/latest/chunks/MJJGGX4V.js | 122ms | 39ms | 8ms | 3rd |
| https://cdn.cookielaw.org/scripttemplates/202603.1.0/otBannerSdk.js | 87ms | 48ms | 24ms | 3rd |
Showing top 10 of 13 scripts
DJS BundlesAction112 scripts, 433 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://dsl.assets.christies.com/react-legacy-integration/production/latest/index.js | 177 KB | 114 KB (65%) | ✓ | 3rd |
| 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://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-6cf5b66b.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
FPage Weight InventoryAction209 resources · 9.6 MB · 433 KB savings availableFIX
~432.8 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 209 resources | 9.6 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
BImage Optimization54 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 Waterfall209 requests over 5216msINFO
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 | 866ms | 221 KB | 41% | $12/mo | Costly |
Unattributable Unattributable | Other | 556ms | 0 KB | — | $7/mo | Costly |
www.christies.com www.christies.com | Other | 419ms | 35 KB | — | $6/mo | Costly |
dsl.assets.christies.com dsl.assets.christies.com | Other | 294ms | 7 KB | — | $4/mo | Costly |
dsl.assets.christies.com dsl.assets.christies.com | Other | 251ms | 177 KB | 65% | $3/mo | Costly |
dsl.assets.christies.com dsl.assets.christies.com | Other | 240ms | 7 KB | — | $3/mo | Costly |
dsl.assets.christies.com dsl.assets.christies.com | Other | 186ms | 11 KB | — | $2/mo | Optional |
assets.adobedtm.com assets.adobedtm.com | Other | 123ms | 108 KB | 40% | $2/mo | Optional |
dsl.assets.christies.com dsl.assets.christies.com | Other | 122ms | 24 KB | — | $2/mo | Optional |
OneTrust cdn.cookielaw.org | Consent | 87ms | 130 KB | 62% | $1/mo | Essential |
www.christies.com www.christies.com | Other | 74ms | 10 KB | — | $1/mo | Optional |
dsl.assets.christies.com dsl.assets.christies.com | Other | 64ms | 4 KB | — | $1/mo | Optional |
code.jquery.com code.jquery.com | Other | 52ms | 31 KB | 72% | $1/mo | Optional |
These scripts may cost more than they're worth
- players.brightcove.net adds 866ms and costs ~$12/month
- Unattributable adds 556ms and costs ~$7/month
- www.christies.com adds 419ms and costs ~$6/month
- dsl.assets.christies.com adds 294ms and costs ~$4/month
- dsl.assets.christies.com adds 251ms and costs ~$3/month
- dsl.assets.christies.com adds 240ms 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 866ms 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 556ms 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 419ms 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 294ms 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 251ms 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
65% 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 240ms 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
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