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.
8.78 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
23.36 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
7.53 s
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.
16.47 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.
46.11 s
Page Load Progression
FPage Weight BudgetAction6.5 MB transferred, 220 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
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
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
FJS Execution CostAction18602ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.bostonherald.com/_static/??-eJyVj7EOwjAMRH+I1rA0MCAGFhY+ImpC45LYUe2A6NcTkECwIDHe6Z7uDq656ZnUk4IGn7xAdZIVJnAoCqMAiyXeF1FObUJqR1nAB5ZjGZAEEg1N0PjGqj5oPLKTX1QOrEwnjBEunhxPkLHXMvmH9R8Y7XwTnP1XH1Ifi6u36qLnssB8fiV2absypjNms+zW4x1eiGQL | 3715ms | 3512ms | 4ms | 3rd |
| https://cmp.osano.com/16A1AnRt2Fn8i1unj/1edc45d9-1a78-48b2-9035-037b31df744a/osano.js | 2428ms | 2191ms | 20ms | 3rd |
| https://www.bostonherald.com/ | 1776ms | 287ms | 15ms | 3rd |
| Unattributable | 1178ms | 192ms | 0ms | 3rd |
| https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604160201/pubads_impl.js | 964ms | 877ms | 52ms | 3rd |
| https://medianewsgroup.blueconic.net/DG/DEFAULT/cs?&callback=bc_json1028 | 697ms | 646ms | 0ms | 3rd |
| https://cdn.p-n.io/pushly-sdk.min.js?domain_key=Rncqm88TXVNQmmtPBkhRPaN7L3XJCGZ33eJS&ver=6.9.4 | 592ms | 532ms | 12ms | 3rd |
| https://cdn.adapex.io/hb/aaw.empowerlocal_c.js | 576ms | 532ms | 37ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-TLFP4R | 575ms | 477ms | 77ms | 3rd |
| https://connext-fd-gnbrate4fjhjb3f7.z01.azurefd.net/index.js | 488ms | 406ms | 3ms | 3rd |
Showing top 10 of 43 scripts
FJS BundlesAction99 scripts, 1.8 MB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://engage.bostonherald.com/prod/dfm/t8y9347t.min.js?2026322 | 292 KB | 186 KB (64%) | ✓ | 3rd |
| https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604160201/pubads_impl.js | 188 KB | 129 KB (69%) | ✓ | 3rd |
| https://www.bostonherald.com/_static/??-eJylzM0OQDAQBOAXoovEz0VcvUZL06y0S+w2PL46iSunSSYzHxxbPq0klgQ2Hx0SQyCXz+iQo2Fg0YLTq1NBIykTafZWLZzBFyMdyJ7yl0ljFG9DSv5rRRz1DewPNIS+bNumK+qqKpcLv3xxFw== | 155 KB | 126 KB (81%) | ✓ | 3rd |
| https://cdn.adapex.io/hb/aaw.empowerlocal_c.js | 169 KB | 100 KB (60%) | ✓ | 3rd |
| https://cds.connatix.com/p/320810193/connatix.player.js | 139 KB | 95 KB (68%) | ✓ | 3rd |
| https://prodmg2.blob.core.windows.net/newsletterwidget/mng/dfm/MG2Widget-newsletterwidget-nojquery.min.js | 111 KB | 76 KB (69%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-LSWCPW2MC3&l=MG2DL&cx=c>m=4e64h1h1 | 145 KB | 72 KB (50%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-KVX6E4M7J9&l=cswDataLayer&cx=c>m=4e64h1 | 144 KB | 72 KB (50%) | ✓ | 3rd |
| https://accounts.google.com/gsi/client?ver=6.9.4 | 96 KB | 71 KB (75%) | ✓ | 3rd |
| https://f023.bostonherald.com/plugin/library/be7a01b612c2a0ddc6a2c3869536e99c | 94 KB | 65 KB (70%) | ✓ | 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 InventoryAction220 resources · 6.5 MB · 1.8 MB savings availableFIX
~1.8 MiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 220 resources | 6.5 MiB | ||||||
CImage OptimizationAction48 images, 0 KB saveableREVIEW
Set explicit width and height to prevent CLS.
Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.
Source: web.dev / Core Web Vitals
Set explicit width and height to prevent CLS.
Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.
Source: web.dev / Core Web Vitals
Set explicit width and height to prevent CLS.
Performance issues directly impact user engagement and conversion rates.
CGreen HostingActionWhether the site is served from green-energy infrastructureREVIEW
Green Hosting
No green hosting detected
BHTTP CachingprivateREVIEW
private
| Directive | Value | Meaning |
|---|---|---|
| private | — | Only browser cache, not CDN/proxy |
A+Text CompressionAll text resources are compressedPASS
A+Font Loading7 fonts (235 KB)PASS
Web fonts
7
235 KB total
Render-blocking
0
of 7
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
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 ~23 KB and ~46 ms
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource Hints15 hints, 0 missing preconnectsPASS
Current Resource Hints
15 resource hints configured
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
Network Waterfall220 requests over 10335msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.bostonherald.com www.bostonherald.com | Other | 3715ms | 10 KB | — | $21/mo | Costly |
cmp.osano.com cmp.osano.com | Other | 2428ms | 63 KB | — | $14/mo | Costly |
www.bostonherald.com www.bostonherald.com | Other | 1776ms | 39 KB | — | $10/mo | Costly |
Unattributable Unattributable | Other | 1178ms | 0 KB | — | $7/mo | Costly |
securepubads.g.doubleclick.net securepubads.g.doubleclick.net | Other | 964ms | 188 KB | 69% | $6/mo | Costly |
medianewsgroup.blueconic.net medianewsgroup.blueconic.net | Other | 697ms | 1 KB | — | $4/mo | Costly |
cdn.p-n.io cdn.p-n.io | Other | 592ms | 0 KB | — | $3/mo | Costly |
cdn.adapex.io cdn.adapex.io | Other | 576ms | 169 KB | 60% | $3/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 575ms | 213 KB | 26% | $3/mo | Costly |
connext-fd-gnbrate4fjhjb3f7.z01.azurefd.net connext-fd-gnbrate4fjhjb3f7.z01.azurefd.net | Other | 488ms | 3 KB | — | $3/mo | Costly |
sdk.mrf.io sdk.mrf.io | Other | 393ms | 63 KB | 39% | $2/mo | Costly |
engage.bostonherald.com engage.bostonherald.com | Other | 373ms | 292 KB | 64% | $2/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 362ms | 171 KB | 38% | $2/mo | Costly |
htlbid.com htlbid.com | Other | 358ms | 133 KB | 33% | $2/mo | Costly |
s.cdn.gcprivacy.net s.cdn.gcprivacy.net | Other | 297ms | 9 KB | — | $2/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 272ms | 159 KB | 39% | $2/mo | Costly |
www.bostonherald.com www.bostonherald.com | Other | 271ms | 155 KB | 81% | $2/mo | Costly |
fundingchoicesmessages.google.com fundingchoicesmessages.google.com | Other | 231ms | 70 KB | 54% | $1/mo | Costly |
tagan.adlightning.com tagan.adlightning.com | Other | 218ms | 15 KB | — | $1/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 213ms | 145 KB | 39% | $1/mo | Costly |
jsDelivr cdn.jsdelivr.net | CDN | 187ms | 81 KB | 47% | $1/mo | Optional |
raven-static.aditude.io raven-static.aditude.io | Other | 175ms | 107 KB | 59% | $1/mo | Optional |
cdn.sophi.io cdn.sophi.io | Other | 174ms | 39 KB | — | $1/mo | Optional |
az416426.vo.msecnd.net az416426.vo.msecnd.net | Other | 162ms | 22 KB | — | $1/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 153ms | 145 KB | 50% | $1/mo | Optional |
tagan.adlightning.com tagan.adlightning.com | Other | 141ms | 31 KB | — | $1/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 141ms | 144 KB | 50% | $1/mo | Optional |
cds.connatix.com cds.connatix.com | Other | 136ms | 139 KB | 68% | $1/mo | Optional |
fp.bostonherald.com fp.bostonherald.com | Other | 135ms | 23 KB | — | $1/mo | Optional |
cdn-p.cityspark.com cdn-p.cityspark.com | Other | 117ms | 23 KB | — | $1/mo | Optional |
securepubads.g.doubleclick.net securepubads.g.doubleclick.net | Other | 112ms | 34 KB | 70% | $1/mo | Optional |
c.amazon-adsystem.com c.amazon-adsystem.com | Other | 103ms | 91 KB | 42% | $1/mo | Optional |
www.bostonherald.com www.bostonherald.com | Other | 101ms | 21 KB | — | $1/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 100ms | 145 KB | 44% | $1/mo | Optional |
tagan.adlightning.com tagan.adlightning.com | Other | 94ms | 72 KB | — | $1/mo | Optional |
g2i.bostonherald.com g2i.bostonherald.com | Other | 90ms | 44 KB | 50% | $1/mo | Optional |
thebestpaints.com thebestpaints.com | Other | 85ms | 36 KB | — | $0/mo | Optional |
www.bostonherald.com www.bostonherald.com | Other | 83ms | 123 KB | — | $0/mo | Optional |
f023.bostonherald.com f023.bostonherald.com | Other | 79ms | 49 KB | — | $0/mo | Optional |
www.bostonherald.com www.bostonherald.com | Other | 75ms | 66 KB | 77% | $0/mo | Optional |
fundingchoicesmessages.google.com fundingchoicesmessages.google.com | Other | 73ms | 84 KB | — | $0/mo | Optional |
raven-static.aditude.io raven-static.aditude.io | Other | 59ms | 6 KB | — | $0/mo | Optional |
cmp.osano.com cmp.osano.com | Other | 52ms | 29 KB | — | $0/mo | Optional |
These scripts may cost more than they're worth
- www.bostonherald.com adds 3715ms and costs ~$21/month
- cmp.osano.com adds 2428ms and costs ~$14/month
- www.bostonherald.com adds 1776ms and costs ~$10/month
- Unattributable adds 1178ms and costs ~$7/month
- securepubads.g.doubleclick.net adds 964ms and costs ~$6/month
- medianewsgroup.blueconic.net adds 697ms and costs ~$4/month
- cdn.p-n.io adds 592ms and costs ~$3/month
- cdn.adapex.io adds 576ms and costs ~$3/month
- Google Tag Manager adds 575ms and costs ~$3/month
- connext-fd-gnbrate4fjhjb3f7.z01.azurefd.net adds 488ms and costs ~$3/month
- sdk.mrf.io adds 393ms and costs ~$2/month
- engage.bostonherald.com adds 373ms and costs ~$2/month
- Google Tag Manager adds 362ms and costs ~$2/month
- htlbid.com adds 358ms and costs ~$2/month
- s.cdn.gcprivacy.net adds 297ms and costs ~$2/month
- Google Tag Manager adds 272ms and costs ~$2/month
- www.bostonherald.com adds 271ms and costs ~$2/month
- fundingchoicesmessages.google.com adds 231ms and costs ~$1/month
- tagan.adlightning.com adds 218ms and costs ~$1/month
- Google Tag Manager adds 213ms and costs ~$1/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.bostonherald.com takes 3715ms 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
cmp.osano.com takes 2428ms 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.bostonherald.com takes 1776ms 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 1178ms 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
securepubads.g.doubleclick.net takes 964ms 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
69% 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
medianewsgroup.blueconic.net takes 697ms 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.p-n.io takes 592ms 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.adapex.io takes 576ms 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
60% of cdn.adapex.io'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
Google Tag Manager takes 575ms 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
connext-fd-gnbrate4fjhjb3f7.z01.azurefd.net takes 488ms 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
sdk.mrf.io takes 393ms 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
engage.bostonherald.com takes 373ms 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
64% of engage.bostonherald.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
Google Tag Manager takes 362ms 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
htlbid.com takes 358ms 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
s.cdn.gcprivacy.net takes 297ms 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
Google Tag Manager takes 272ms 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.bostonherald.com takes 271ms 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
81% of www.bostonherald.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
fundingchoicesmessages.google.com takes 231ms 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
54% of fundingchoicesmessages.google.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
tagan.adlightning.com takes 218ms 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
Google Tag Manager takes 213ms 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
59% of raven-static.aditude.io'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 cds.connatix.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
70% 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
50% of g2i.bostonherald.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
77% of www.bostonherald.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