Performance
· 17 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.
10.02 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
20.39 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
2.22 s
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.076
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
10.68 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.
22.06 s
Page Load Progression
FPage Weight BudgetAction2.9 MB transferred, 122 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
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 CostAction7696ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://rvo-cohesion.medicalnewstoday.com/cohesion/cohesion-tpo.min.js?cDomain=medicalnewstoday.com | 1422ms | 1330ms | 14ms | 3rd |
| Unattributable | 1202ms | 237ms | 0ms | 3rd |
| https://prod.adspsp.com/adb.2418030m.cr.js?c=Cx04533cf4:mo8tqq8j:20 | 649ms | 610ms | 24ms | 3rd |
| https://cdn.confiant-integrations.net/gptprebidnative/202603241056/wrap.js | 530ms | 416ms | 49ms | 3rd |
| https://assets.medicalnewstoday.com/_next/4331d740-2698-49a4-beb4-128e3470bb78/mnt/lib.js | 494ms | 193ms | 74ms | 3rd |
| https://www.medicalnewstoday.com/ | 433ms | 47ms | 18ms | 3rd |
| https://gtm-server.healthline.com/gtag/js?id=G-930KV6HDTB&cx=c>m=4e64k0h2&sign=e7e8a5ac2749c76ad4cc1740dc3d9d1285e44da1f63f242a086873a515f0036b_20260421 | 423ms | 358ms | 60ms | 3rd |
| https://gtm-server.healthline.com/gtm.js?id=GTM-MB6365D | 367ms | 299ms | 64ms | 3rd |
| https://prod.adspsp.com/adb.2418030m.pb.js?c=Cx04533cf4:mo8tqq8j:20 | 361ms | 260ms | 58ms | 3rd |
| https://client.aps.amazon-adsystem.com/publisher.js | 316ms | 221ms | 42ms | 3rd |
Showing top 10 of 25 scripts
FJS BundlesAction46 scripts, 1.4 MB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://assets.medicalnewstoday.com/_next/4331d740-2698-49a4-beb4-128e3470bb78/mnt/felib.js | 402 KB | 354 KB (88%) | ✓ | 3rd |
| https://assets.medicalnewstoday.com/_next/4331d740-2698-49a4-beb4-128e3470bb78/mnt/lib.js | 251 KB | 177 KB (71%) | ✓ | 3rd |
| https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604160201/pubads_impl.js | 188 KB | 141 KB (75%) | ✓ | 3rd |
| https://assets.medicalnewstoday.com/_next/4331d740-2698-49a4-beb4-128e3470bb78/mnt/vendor.js | 171 KB | 107 KB (63%) | ✓ | 3rd |
| https://prod.adspsp.com/adb.2418030m.pb.js?c=Cx04533cf4:mo8tqq8j:20 | 155 KB | 105 KB (68%) | ✓ | 3rd |
| https://cdn.confiant-integrations.net/gptprebidnative/202603241056/wrap.js | 142 KB | 87 KB (62%) | ✓ | 3rd |
| https://cdn.cookielaw.org/scripttemplates/202601.2.0/otBannerSdk.js | 128 KB | 84 KB (65%) | ✓ | 3rd |
| https://gtm-server.healthline.com/gtag/js?id=G-930KV6HDTB&cx=c>m=4e64k0h2&sign=e7e8a5ac2749c76ad4cc1740dc3d9d1285e44da1f63f242a086873a515f0036b_20260421 | 205 KB | 82 KB (40%) | ✓ | 3rd |
| https://gtm-server.healthline.com/gtm.js?id=GTM-MB6365D | 164 KB | 70 KB (43%) | ✓ | 3rd |
| https://client.aps.amazon-adsystem.com/publisher.js | 82 KB | 45 KB (55%) | ✓ | 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 InventoryAction122 resources · 2.9 MB · 1.4 MB savings availableFIX
~1.4 MiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 122 resources | 2.9 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
BImage Optimization13 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 (155 KB)PASS
Web fonts
5
155 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 ~3 KB and ~6 ms
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource Hints19 hints, 0 missing preconnectsPASS
Current Resource Hints
19 resource hints configured
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
Network Waterfall122 requests over 3855msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
rvo-cohesion.medicalnewstoday.com rvo-cohesion.medicalnewstoday.com | Other | 1422ms | 29 KB | — | €15/mo | Costly |
Unattributable Unattributable | Other | 1202ms | 0 KB | — | €13/mo | Costly |
prod.adspsp.com prod.adspsp.com | Other | 649ms | 73 KB | 45% | €7/mo | Costly |
cdn.confiant-integrations.net cdn.confiant-integrations.net | Other | 530ms | 142 KB | 62% | €6/mo | Costly |
assets.medicalnewstoday.com assets.medicalnewstoday.com | Other | 494ms | 251 KB | 71% | €5/mo | Costly |
www.medicalnewstoday.com www.medicalnewstoday.com | Other | 433ms | 48 KB | — | €5/mo | Costly |
gtm-server.healthline.com gtm-server.healthline.com | Other | 423ms | 205 KB | 40% | €5/mo | Costly |
gtm-server.healthline.com gtm-server.healthline.com | Other | 367ms | 164 KB | 43% | €4/mo | Costly |
prod.adspsp.com prod.adspsp.com | Other | 361ms | 155 KB | 68% | €4/mo | Costly |
client.aps.amazon-adsystem.com client.aps.amazon-adsystem.com | Other | 316ms | 82 KB | 55% | €3/mo | Costly |
securepubads.g.doubleclick.net securepubads.g.doubleclick.net | Other | 260ms | 188 KB | 75% | €3/mo | Costly |
ats-wrapper.privacymanager.io ats-wrapper.privacymanager.io | Other | 152ms | 75 KB | 50% | €2/mo | Optional |
assets.medicalnewstoday.com assets.medicalnewstoday.com | Other | 127ms | 171 KB | 63% | €1/mo | Optional |
OneTrust cdn.cookielaw.org | Consent | 109ms | 128 KB | 65% | €1/mo | Essential |
pub.doubleverify.com pub.doubleverify.com | Other | 103ms | 31 KB | — | €1/mo | Optional |
assets.medicalnewstoday.com assets.medicalnewstoday.com | Other | 101ms | 13 KB | — | €1/mo | Optional |
securepubads.g.doubleclick.net securepubads.g.doubleclick.net | Other | 97ms | 34 KB | — | €1/mo | Optional |
cdn.id5-sync.com cdn.id5-sync.com | Other | 90ms | 35 KB | — | €1/mo | Optional |
OneTrust cdn.cookielaw.org | Consent | 84ms | 9 KB | — | €1/mo | Essential |
cdn-ima.33across.com cdn-ima.33across.com | Other | 75ms | 7 KB | — | €1/mo | Optional |
cdn.confiant-integrations.net cdn.confiant-integrations.net | Other | 67ms | 65 KB | — | €1/mo | Optional |
OneTrust cdn.cookielaw.org | Consent | 64ms | 2 KB | — | €1/mo | Essential |
secure.cdn.fastclick.net secure.cdn.fastclick.net | Other | 60ms | 22 KB | — | €1/mo | Optional |
cdn.btmessage.com cdn.btmessage.com | Other | 59ms | 51 KB | 60% | €1/mo | Optional |
assets.medicalnewstoday.com assets.medicalnewstoday.com | Other | 50ms | 402 KB | 88% | €1/mo | Optional |
These scripts may cost more than they're worth
- rvo-cohesion.medicalnewstoday.com adds 1422ms and costs ~€15/month
- Unattributable adds 1202ms and costs ~€13/month
- prod.adspsp.com adds 649ms and costs ~€7/month
- cdn.confiant-integrations.net adds 530ms and costs ~€6/month
- assets.medicalnewstoday.com adds 494ms and costs ~€5/month
- www.medicalnewstoday.com adds 433ms and costs ~€5/month
- gtm-server.healthline.com adds 423ms and costs ~€5/month
- gtm-server.healthline.com adds 367ms and costs ~€4/month
- prod.adspsp.com adds 361ms and costs ~€4/month
- client.aps.amazon-adsystem.com adds 316ms and costs ~€3/month
- securepubads.g.doubleclick.net adds 260ms 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
rvo-cohesion.medicalnewstoday.com takes 1422ms 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 1202ms 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
prod.adspsp.com takes 649ms 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
cdn.confiant-integrations.net takes 530ms 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 cdn.confiant-integrations.net'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
assets.medicalnewstoday.com takes 494ms 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
71% of assets.medicalnewstoday.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.medicalnewstoday.com takes 433ms 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
gtm-server.healthline.com takes 423ms 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
gtm-server.healthline.com takes 367ms 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
prod.adspsp.com takes 361ms 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
68% of prod.adspsp.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
client.aps.amazon-adsystem.com takes 316ms 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
55% of client.aps.amazon-adsystem.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
securepubads.g.doubleclick.net takes 260ms 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 securepubads.g.doubleclick.net'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
63% of assets.medicalnewstoday.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
65% 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
60% of cdn.btmessage.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
88% of assets.medicalnewstoday.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