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.
803 ms
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
1.66 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
224 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.
1.38 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.
3.39 s
Page Load Progression
FPage Weight BudgetAction9.0 MB transferred, 82 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 BundlesAction26 scripts, 448 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.googletagmanager.com/gtag/js?id=G-6RMD5F01JZ&cx=c>m=4e64k1 | 157 KB | 66 KB (42%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-56KVS72 | 180 KB | 61 KB (34%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-WEC3LEBYC9&cx=c>m=4e64k1 | 172 KB | 59 KB (34%) | ✓ | 3rd |
| https://aamc.tfaforms.net/wForms/3.11/js/wforms.js | 84 KB | 59 KB (70%) | ✓ | 3rd |
| https://www.aamc.org/sites/default/files/js/js_0pQ4-3upvNFJx2BwDmd6MF6mSnE3J4HdMA30u2n1iyk.js?scope=footer&delta=6&language=en&theme=hippocrates&include=eJx1UG2SgyAMvZDKkZgIKaYF4pDotLdfpLrqzuwfyPsg5AUgOQs-UTbwWw5naZ_SNRTAukWUk8UVs4oJzCGiVQg2QYaA5W6wE2QfsXyfF4yg6C0pJuPLMkMcrtzXJcLmgR5L4yMHyqcQKb8qB_7o2Uh2L7vkdpHj3b4oRdKPuYIB6jBqx2Y9Uh3GfaIr1-Fbty8PbYfdmduEevzFAzzhfSdTN9E8s9tSicE01oS-f3C5CyHyCPFGTVi4X8kj947TzLku9mYQBZV_NJ0wYd_y3nl2_VWjNBde677TEpWsYESnhpJ0UqWaoqDU9kLrFmiMuE_ai37qRsIPxjbjfg | 91 KB | 56 KB (62%) | ✓ | 3rd |
| https://www.aamc.org/sites/default/files/js/js_5Zl9LscdZ3Nf0YS_nPGZRBsDFXf_fEzrAxVXD4nqaa0.js?scope=footer&delta=0&language=en&theme=hippocrates&include=eJx1UG2SgyAMvZDKkZgIKaYF4pDotLdfpLrqzuwfyPsg5AUgOQs-UTbwWw5naZ_SNRTAukWUk8UVs4oJzCGiVQg2QYaA5W6wE2QfsXyfF4yg6C0pJuPLMkMcrtzXJcLmgR5L4yMHyqcQKb8qB_7o2Uh2L7vkdpHj3b4oRdKPuYIB6jBqx2Y9Uh3GfaIr1-Fbty8PbYfdmduEevzFAzzhfSdTN9E8s9tSicE01oS-f3C5CyHyCPFGTVi4X8kj947TzLku9mYQBZV_NJ0wYd_y3nl2_VWjNBde677TEpWsYESnhpJ0UqWaoqDU9kLrFmiMuE_ai37qRsIPxjbjfg | 83 KB | 55 KB (66%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/destination?id=AW-746638938&cx=c>m=4e64k1 | 146 KB | 55 KB (38%) | ✓ | 3rd |
| https://script.hotjar.com/modules.6a0f3932cb1341a35c18.js | 57 KB | 38 KB (67%) | ✓ | 3rd |
| https://aamc.tfaforms.net/wForms/3.11/js/wforms_calendar.js | 2 KB | — | ✓ | 3rd |
| https://www.youtube.com/iframe_api | 3 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 InventoryAction82 resources · 9.0 MB · 448 KB savings availableFIX
~447.8 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 82 resources | 9.0 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
BImage Optimization19 images, 0 KB saveableREVIEW
CJS Execution CostAction1341ms total JS executionREVIEW
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.aamc.org/ | 196ms | 2ms | 0ms | 3rd |
| https://www.aamc.org/sites/default/files/js/js_0pQ4-3upvNFJx2BwDmd6MF6mSnE3J4HdMA30u2n1iyk.js?scope=footer&delta=6&language=en&theme=hippocrates&include=eJx1UG2SgyAMvZDKkZgIKaYF4pDotLdfpLrqzuwfyPsg5AUgOQs-UTbwWw5naZ_SNRTAukWUk8UVs4oJzCGiVQg2QYaA5W6wE2QfsXyfF4yg6C0pJuPLMkMcrtzXJcLmgR5L4yMHyqcQKb8qB_7o2Uh2L7vkdpHj3b4oRdKPuYIB6jBqx2Y9Uh3GfaIr1-Fbty8PbYfdmduEevzFAzzhfSdTN9E8s9tSicE01oS-f3C5CyHyCPFGTVi4X8kj947TzLku9mYQBZV_NJ0wYd_y3nl2_VWjNBde677TEpWsYESnhpJ0UqWaoqDU9kLrFmiMuE_ai37qRsIPxjbjfg | 185ms | 62ms | 9ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-56KVS72 | 178ms | 155ms | 20ms | 3rd |
| Unattributable | 161ms | 9ms | 0ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-WEC3LEBYC9&cx=c>m=4e64k1 | 147ms | 125ms | 20ms | 3rd |
| https://www.aamc.org/sites/default/files/js/js_5Zl9LscdZ3Nf0YS_nPGZRBsDFXf_fEzrAxVXD4nqaa0.js?scope=footer&delta=0&language=en&theme=hippocrates&include=eJx1UG2SgyAMvZDKkZgIKaYF4pDotLdfpLrqzuwfyPsg5AUgOQs-UTbwWw5naZ_SNRTAukWUk8UVs4oJzCGiVQg2QYaA5W6wE2QfsXyfF4yg6C0pJuPLMkMcrtzXJcLmgR5L4yMHyqcQKb8qB_7o2Uh2L7vkdpHj3b4oRdKPuYIB6jBqx2Y9Uh3GfaIr1-Fbty8PbYfdmduEevzFAzzhfSdTN9E8s9tSicE01oS-f3C5CyHyCPFGTVi4X8kj947TzLku9mYQBZV_NJ0wYd_y3nl2_VWjNBde677TEpWsYESnhpJ0UqWaoqDU9kLrFmiMuE_ai37qRsIPxjbjfg | 143ms | 92ms | 10ms | 3rd |
| https://www.googletagmanager.com/gtag/destination?id=AW-746638938&cx=c>m=4e64k1 | 139ms | 111ms | 25ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-6RMD5F01JZ&cx=c>m=4e64k1 | 132ms | 97ms | 17ms | 3rd |
| https://script.hotjar.com/modules.6a0f3932cb1341a35c18.js | 60ms | 47ms | 11ms | 3rd |
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 Loading4 fonts (102 KB)PASS
Web fonts
4
102 KB total
Render-blocking
0
of 4
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
Network Waterfall82 requests over 1644msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.aamc.org www.aamc.org | Other | 196ms | 35 KB | — | €2/mo | Optional |
www.aamc.org www.aamc.org | Other | 185ms | 91 KB | 62% | €2/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 178ms | 180 KB | 34% | €2/mo | Optional |
Unattributable Unattributable | Other | 161ms | 0 KB | — | €2/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 147ms | 172 KB | 34% | €2/mo | Optional |
www.aamc.org www.aamc.org | Other | 143ms | 83 KB | 66% | €2/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 139ms | 146 KB | 38% | €2/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 132ms | 157 KB | 42% | €1/mo | Optional |
Hotjar script.hotjar.com | Session Replay | 60ms | 57 KB | 67% | €1/mo | Optional |
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
62% of www.aamc.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
66% of www.aamc.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
67% of Hotjar'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