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.
1.68 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
1.77 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
247 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.034
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
2.19 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.
4.21 s
Page Load Progression
FPage Weight BudgetAction3.2 MB transferred, 131 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 BundlesAction48 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 | 176 KB (70%) | ✓ | 3rd |
| https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604200101/pubads_impl.js?cb=31097964 | 188 KB | 139 KB (74%) | ✓ | 3rd |
| https://prod.adspsp.com/adb.2418030m.pb.js?c=Cx04533cf4:mo8tqq8j:20 | 155 KB | 105 KB (68%) | ✓ | 3rd |
| https://assets.medicalnewstoday.com/_next/4331d740-2698-49a4-beb4-128e3470bb78/mnt/vendor.js | 171 KB | 104 KB (61%) | ✓ | 3rd |
| https://gtm-server.healthline.com/gtag/js?id=G-930KV6HDTB&cx=c>m=4e64k0h2&sign=c15fd755e2e9746b9861aac0f43d36320735ca880d8b0fbd26fa676e9b538baf_20260421 | 223 KB | 89 KB (40%) | ✓ | 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/gtm.js?id=GTM-MB6365D | 178 KB | 79 KB (44%) | ✓ | 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 InventoryAction131 resources · 3.2 MB · 1.4 MB savings availableFIX
~1.4 MiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 131 resources | 3.2 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 CostAction1751ms total JS executionREVIEW
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| Unattributable | 351ms | 57ms | 0ms | 3rd |
| https://rvo-cohesion.medicalnewstoday.com/cohesion/cohesion-tpo.min.js?cDomain=medicalnewstoday.com | 350ms | 327ms | 4ms | 3rd |
| https://www.medicalnewstoday.com/ | 140ms | 13ms | 5ms | 3rd |
| https://prod.adspsp.com/adb.2418030m.cr.js?c=Cx04533cf4:mo8tqq8j:20 | 136ms | 124ms | 7ms | 3rd |
| https://gtm-server.healthline.com/gtm.js?id=GTM-MB6365D | 119ms | 91ms | 15ms | 3rd |
| https://cdn.confiant-integrations.net/gptprebidnative/202603241056/wrap.js | 117ms | 104ms | 12ms | 3rd |
| https://assets.medicalnewstoday.com/_next/4331d740-2698-49a4-beb4-128e3470bb78/mnt/lib.js | 117ms | 48ms | 19ms | 3rd |
| https://gtm-server.healthline.com/gtag/js?id=G-930KV6HDTB&cx=c>m=4e64k0h2&sign=c15fd755e2e9746b9861aac0f43d36320735ca880d8b0fbd26fa676e9b538baf_20260421 | 110ms | 93ms | 16ms | 3rd |
| https://assets.medicalnewstoday.com/_next/4331d740-2698-49a4-beb4-128e3470bb78/mnt/vendor.js | 90ms | 18ms | 18ms | 3rd |
| https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604200101/pubads_impl.js?cb=31097964 | 82ms | 49ms | 18ms | 3rd |
Showing top 10 of 12 scripts
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 HintsNo optimization neededPASS
Network Waterfall131 requests over 4011msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
Unattributable Unattributable | Other | 351ms | 0 KB | — | €4/mo | Costly |
rvo-cohesion.medicalnewstoday.com rvo-cohesion.medicalnewstoday.com | Other | 350ms | 29 KB | — | €4/mo | Costly |
www.medicalnewstoday.com www.medicalnewstoday.com | Other | 140ms | 48 KB | — | €2/mo | Optional |
prod.adspsp.com prod.adspsp.com | Other | 136ms | 73 KB | 46% | €1/mo | Optional |
gtm-server.healthline.com gtm-server.healthline.com | Other | 119ms | 178 KB | 44% | €1/mo | Optional |
cdn.confiant-integrations.net cdn.confiant-integrations.net | Other | 117ms | 142 KB | 62% | €1/mo | Optional |
assets.medicalnewstoday.com assets.medicalnewstoday.com | Other | 117ms | 251 KB | 70% | €1/mo | Optional |
gtm-server.healthline.com gtm-server.healthline.com | Other | 110ms | 223 KB | 40% | €1/mo | Optional |
assets.medicalnewstoday.com assets.medicalnewstoday.com | Other | 90ms | 171 KB | 61% | €1/mo | Optional |
securepubads.g.doubleclick.net securepubads.g.doubleclick.net | Other | 82ms | 188 KB | 74% | €1/mo | Optional |
client.aps.amazon-adsystem.com client.aps.amazon-adsystem.com | Other | 71ms | 82 KB | 55% | €1/mo | Optional |
prod.adspsp.com prod.adspsp.com | Other | 68ms | 155 KB | 68% | €1/mo | Optional |
These scripts may cost more than they're worth
- Unattributable adds 351ms and costs ~€4/month
- rvo-cohesion.medicalnewstoday.com adds 350ms and costs ~€4/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
Unattributable takes 351ms 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
rvo-cohesion.medicalnewstoday.com takes 350ms 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
70% 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
61% 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
74% 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
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
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