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.
2.10 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
3.30 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
3 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.010
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
2.94 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.
3.32 s
Page Load Progression
DPage Weight BudgetAction2.5 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
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
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
FJS BundlesAction30 scripts, 578 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://atlas.collegeboard.org/apricot/prod/4.11.5/main.min.js | 149 KB | 127 KB (91%) | ✓ | 3rd |
| https://kiwi.collegeboard.org/embed.js | 212 KB | 107 KB (51%) | ✓ | 3rd |
| https://cdnjs.cloudflare.com/ajax/libs/mathjax/3.2.2/es5/tex-mml-chtml.js | 201 KB | 97 KB (49%) | ✓ | 3rd |
| https://cdn.cookielaw.org/scripttemplates/202509.1.0/otBannerSdk.js | 122 KB | 63 KB (52%) | ✓ | 3rd |
| https://bigfuture.collegeboard.org/widgets/v2/CollegeSearchAndSaveTypeahead.js | 88 KB | 59 KB (67%) | ✓ | 3rd |
| https://www.collegeboard.org/media/js/js_iVjiK8VqT9Zh3SDpA36V2PzUlkitrd3JUa6lhq4UXhc.js?scope=footer&delta=5&language=en&theme=apricot_theme&include=eJxdzlEKAyEMBNALiR4pRHeqLmokZmnp6btfLfZvHsPA8MkvasIHNPAveysqMUIdT61JjNY1p6iFCV0yuNU3W5Xx7a2gI2xy56IkfcrAsBAfN1pDBi2wpuJ30rMeGbaPUiTRTEU6Jmf4P7vOVu7XYcmlCR_pLlGN | 64 KB | 49 KB (77%) | ✓ | 3rd |
| https://www.collegeboard.org/2blxFu2OYUH5/-opIpNMIkZ/wg/YrzaLGQGX4fNNz/ITk8VCBifQU/Dx9XL3A/rd14B | 198 KB | 40 KB (20%) | ✓ | 3rd |
| https://athena.collegeboard.org/2.2.4/cbw-widgets.min.js | 81 KB | 37 KB (46%) | ✓ | 3rd |
| https://kiwi.collegeboard.org/fpid.js | 0 KB | — | ✓ | 3rd |
| https://cdn.cookielaw.org/scripttemplates/otSDKStub.js | 9 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 InventoryAction73 resources · 2.5 MB · 578 KB savings availableFIX
~578.1 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 73 resources | 2.5 MiB | ||||||
DHTTP CachingActionno-store (uncacheable)FIX
no-store, max-age=0
| Directive | Value | Meaning |
|---|---|---|
| no-store | — | Never cache this response |
| max-age | 0 | Cache for 0 seconds |
BJS Execution Cost845ms total JS executionREVIEW
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.collegeboard.org/2blxFu2OYUH5/-opIpNMIkZ/wg/YrzaLGQGX4fNNz/ITk8VCBifQU/Dx9XL3A/rd14B | 254ms | 236ms | 10ms | 3rd |
| https://www.collegeboard.org/ | 233ms | 1ms | 0ms | 3rd |
| https://cdnjs.cloudflare.com/ajax/libs/mathjax/3.2.2/es5/tex-mml-chtml.js | 94ms | 70ms | 23ms | 3rd |
| Unattributable | 94ms | 31ms | 0ms | 3rd |
| https://kiwi.collegeboard.org/embed.js | 94ms | 69ms | 22ms | 3rd |
| https://cdn.cookielaw.org/scripttemplates/202509.1.0/otBannerSdk.js | 76ms | 48ms | 10ms | 3rd |
CGreen HostingActionWhether the site is served from green-energy infrastructureREVIEW
Green Hosting
No green hosting detected
A+Text CompressionAll text resources are compressedPASS
AImage Optimization4 images, 0 KB saveablePASS
A+Font Loading13 fonts (639 KB)PASS
Web fonts
13
639 KB total
Render-blocking
0
of 13
Dominant font-display
swap
Most common across fonts
Font loading timeline
- Convert to woff2 for ~30% smaller file size
- Convert to woff2 for ~30% smaller file size
- Convert to woff2 for ~30% smaller file size
- Convert to woff2 for ~30% smaller file size
- Convert to woff2 for ~30% smaller file size
- 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 ~55 KB and ~110 ms
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource HintsNo optimization neededPASS
Network Waterfall73 requests over 2942msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.collegeboard.org www.collegeboard.org | Other | 254ms | 1 KB | 20% | €3/mo | Costly |
www.collegeboard.org www.collegeboard.org | Other | 233ms | 14 KB | — | €3/mo | Costly |
cdnjs cdnjs.cloudflare.com | CDN | 94ms | 201 KB | 49% | €1/mo | Optional |
Unattributable Unattributable | Other | 94ms | 0 KB | — | €1/mo | Optional |
kiwi.collegeboard.org kiwi.collegeboard.org | Other | 94ms | 212 KB | 51% | €1/mo | Optional |
OneTrust cdn.cookielaw.org | Consent | 76ms | 122 KB | 52% | €1/mo | Essential |
These scripts may cost more than they're worth
- www.collegeboard.org adds 254ms and costs ~€3/month
- www.collegeboard.org adds 233ms 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
www.collegeboard.org takes 254ms 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.collegeboard.org takes 233ms 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 kiwi.collegeboard.org'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
52% 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