Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.

SCORE

GRADE

FIX

REVIEW

PASS

INFO

Performance-focused optimization plan with CWV assessment, top offenders, and time estimates

Mobile Desktop

Performance

Accessibility

Best Practices

SEO

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

8.95 s

Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.

25.26 s

Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.

11.34 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.

18.15 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.

48.73 s

Page Load Progression

494 ms

988 ms

1.5 s

2.0 s

2.5 s

3.0 s

3.5 s

4.0 s

Checks

7 PASS 3 REVIEW 5 FIX

Page Weight Budget

Action

6.5 MB transferred, 226 requests

FIX

6.5 MB transferred, 226 requests

Page weighs 20.8 MB (6.5 MB transferred)

JavaScript is 4.2 MB — consider code splitting or lazy loading

Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.

Got: 4.2 MB

Images are 1.6 MB — compress or use modern formats

Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.

Got: 1.6 MB

Fonts are 235 KB — consider subsetting or using system fonts

Subset fonts to include only used characters, or switch to system font stacks.

Got: 235 KB

CSS is 202 KB — consider purging unused styles

Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.

Got: 202 KB

226 HTTP requests — consider bundling or reducing

Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.

Estimated 1.4 g CO2 per page load

6.5 MB transferred

226 requests

1.4 g CO2 per page load

JavaScript 4.2 MiB 65%

Images 1.6 MiB 25%

Fonts 234.8 KiB 4%

CSS 202.4 KiB 3%

Other 111.2 KiB 2%

Other 62.4 KiB 1%

HTML 44.7 KiB 1%

Other 24.8 KiB 0%

Other 0 B 0%

0 2.4 MB 4.9 MB

Over budget

Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.

Source: web.dev

Third-Party Impact

Action

100% third-party, 0 ms blocking

FIX

100% third-party, 0 ms blocking

Third-party code accounts for 100% of page weight (6.5 MiB of 6.5 MiB)

Third-party blocking time is low (0 ms)

100%

First-party Third-party

JS Execution Cost

Action

22265ms total JS execution

FIX

22265ms total JS execution

https://www.mercurynews.com/_static/??-eJyVj8EKwjA...: 7649ms CPU time

https://cmp.osano.com/16A1AnRt2Fn8i1unj/1edc45d9-1...: 2763ms CPU time

https://www.mercurynews.com/: 1586ms CPU time

Unattributable: 1449ms CPU time

https://securepubads.g.doubleclick.net/pagead/mana...: 923ms CPU time

Third-party scripts: 22265ms (100% of total)

Main Thread Breakdown

Script Evaluation 78% Other 8% Script Parsing & Compilation 5% Style & Layout 5%

Script	Total	Scripting	Parse/Compile	Party
https://www.mercurynews.com/_static/??-eJyVj8EKwjAQRH/IdlG07UU8ePHiR4QmNluT3dDdKPbrjYKiF8HjDPOYGbimqmdSRwrqXXQCxYlGmMCiKIwCLIZ4n0U51hGpHmUBH1gKeUASiDRUXsMbK/qg4chWflHJszKdMAS4OLI8QcJe8+Qe1n9gMPNNcHZffUh9yLbcKoueyzzz+ZXYxe2ybdfNqum6zXgHXmRkBw==	7649ms	7478ms	3ms	3rd
https://cmp.osano.com/16A1AnRt2Fn8i1unj/1edc45d9-1a78-48b2-9035-037b31df744a/osano.js	2763ms	2520ms	23ms	3rd
https://www.mercurynews.com/	1586ms	230ms	14ms	3rd
Unattributable	1449ms	169ms	0ms	3rd
https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604160201/pubads_impl.js	923ms	836ms	42ms	3rd
https://cdn.p-n.io/pushly-sdk.min.js?domain_key=kxKkF9MK5Eh8oIGD7DDm6lvkHUj6DuIrCOQh&ver=6.9.4	587ms	526ms	18ms	3rd
https://cdn.adapex.io/hb/aaw.empowerlocal_b.js	537ms	488ms	44ms	3rd
https://connext-fd-gnbrate4fjhjb3f7.z01.azurefd.net/index.js	441ms	392ms	3ms	3rd
https://www.googletagmanager.com/gtag/js?id=G-LMTT1ZNHB1&cx=c&gtm=4e64h1	395ms	292ms	37ms	3rd
https://www.mercurynews.com/_static/??-eJyl0MEKwzAIANAfWiIbI6GHset+I2lCMCSuTMP6+bPHngbtQUTRJwjfxcxvkkwCSxsFiaFTMQkL8ogMLEFw3vVsD0g2Dkot28oXOGLoAuVVzjI6jNJy18xnrYGvsAGfPxCjZLMrYqACCVmg6p3tO12j8rM/rt47P7m7u9UfAM2Ivg==	378ms	277ms	95ms	3rd

Showing top 10 of 44 scripts

JS Bundles

Action

104 scripts, 1.8 MB unused

FIX

104 scripts, 1.8 MB unused

https://engage.mercurynews.com/prod/dfm/t8y9347t.m...: 186 KB unused (64%)

Consider code splitting or tree shaking to reduce unused code.

https://securepubads.g.doubleclick.net/pagead/mana...: 129 KB unused (69%)

Consider code splitting or tree shaking to reduce unused code.

https://www.mercurynews.com/_static/??-eJyl0MEKwzA...: 126 KB unused (81%)

Consider code splitting or tree shaking to reduce unused code.

https://cdn.adapex.io/hb/aaw.empowerlocal_b.js: 112 KB unused (64%)

Consider code splitting or tree shaking to reduce unused code.

https://prodmg2.blob.core.windows.net/newsletterwi...: 110 KB unused (77%)

Consider code splitting or tree shaking to reduce unused code.

Total unused JavaScript: 1.8 MB

1881 KB unused JavaScript

Downloaded but never executed on this page.

Script	Size	Unused	Minified	Party
https://engage.mercurynews.com/prod/dfm/t8y9347t.min.js?2026321	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.mercurynews.com/_static/??-eJyl0MEKwzAIANAfWiIbI6GHset+I2lCMCSuTMP6+bPHngbtQUTRJwjfxcxvkkwCSxsFiaFTMQkL8ogMLEFw3vVsD0g2Dkot28oXOGLoAuVVzjI6jNJy18xnrYGvsAGfPxCjZLMrYqACCVmg6p3tO12j8rM/rt47P7m7u9UfAM2Ivg==	155 KB	126 KB (81%)	✓	3rd
https://cdn.adapex.io/hb/aaw.empowerlocal_b.js	178 KB	112 KB (64%)	✓	3rd
https://prodmg2.blob.core.windows.net/newsletterwidget/mngcep/mg2nw.min.js	144 KB	110 KB (77%)	✓	3rd
https://cds.connatix.com/p/320810193/connatix.player.js	139 KB	95 KB (68%)	✓	3rd
https://htlbid.com/v3/mercurynews.com/htlbid.js?ver=6.9.4	138 KB	76 KB (55%)	✓	3rd
https://accounts.google.com/gsi/client?ver=6.9.4	96 KB	72 KB (75%)	✓	3rd
https://www.googletagmanager.com/gtag/js?id=G-KVX6E4M7J9&l=cswDataLayer&cx=c&gtm=4e64h1	144 KB	71 KB (50%)	✓	3rd
https://www.googletagmanager.com/gtm.js?id=GTM-NFD2QGD&l=MG2DL	171 KB	64 KB (38%)	✓	3rd

Consider code splitting or tree shaking to reduce unused code.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Page Weight Inventory

Action

226 resources · 6.5 MB · 1.8 MB savings available

FIX

226 resources · 6.5 MB · 1.8 MB savings available

Page weight 5.5 MB over 1MB target

Got: 6.5 MB Expected: ≤ 1 MB

~1.8 MB of savings available

225 third-party resources (100% of weight)

4 resources over 200KB

226 resources · 6.5 MiB · 225 third-party 5.5 MiB over 1MB target

JavaScript 65% · 4.2 MiB

Image 25% · 1.6 MiB

Font 4% · 234.8 KiB

CSS 3% · 202.4 KiB

Other 3% · 193.4 KiB

Document 1% · 45.4 KiB

~1.8 MiB of savings available

Remove unused JavaScript: 1.8 MiB

#	Resource	Type	Size	Cache	Unused	3rd party	Issues

226 resources			6.5 MiB

Image Optimization

47 images, 0 KB saveable

REVIEW

47 images, 0 KB saveable

is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

47 images 1.6 MB

0 oversized -0 KB

34 legacy format

1 missing dimensions CLS risk

Set explicit width and height to prevent CLS.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Green Hosting

Action

Whether the site is served from green-energy infrastructure

REVIEW

Green Hosting

No green hosting detected

HTTP Caching

private

REVIEW

private

Cache-Control header is set

Got: private

No ETag or Last-Modified header

Conditional requests (304 Not Modified) are not possible without validators.

Cache-Control

private

Directive	Value	Meaning
private	—	Only browser cache, not CDN/proxy

A+

Text Compression

All text resources are compressed

PASS

All text resources are compressed

All text resources are properly compressed.

A+

Font Loading

7 fonts (235 KB)

PASS

7 fonts (235 KB)

7 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

235 KB total

Render-blocking

of 7

Dominant font-display

swap

Most common across fonts

Font loading timeline

Transfer FOIT (block) FOUT (swap)

truetype;base64,AAEAAAA... unknown swap

Size 32 KB

Load time 78 ms

Start 3.0 s

Risk FOUT — text flashes from fallback to web font

o-0bIpQlx3QUlC5A4PNB6Ry... woff2 swap

Size 35 KB

Load time 61 ms

Start 3.0 s

Risk FOUT — text flashes from fallback to web font

bootstrap-icons.woff2 woff2 swap

Size 89 KB

Load time 23 ms

Start 3.0 s

Risk FOUT — text flashes from fallback to web font

ga6daw1J5X9T9RW6j9bNVls... woff2 swap

Size 36 KB

Load time 57 ms

Start 3.0 s

Risk FOUT — text flashes from fallback to web font

icomoon.woff woff swap

Size 2 KB

Load time 154 ms

Start 4.1 s

Risk FOUT — text flashes from fallback to web font

Convert to woff2 for ~30% smaller file size

KFOmCnqEu92Fr1Mu4mxP.ttf ttf swap

Size 20 KB

Load time 25 ms

Start 4.1 s

Risk FOUT — text flashes from fallback to web font

Convert to woff2 for ~30% smaller file size

KFOlCnqEu92Fr1MmWUlfBBc... ttf swap

Size 20 KB

Load time 31 ms

Start 4.2 s

Risk FOUT — text flashes from fallback to web font

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 Caching

All resources properly cached

PASS

All resources properly cached

No caching issues found

All static resources have appropriate caching headers.

A+

Critical Rendering Path

No render-blocking resources

PASS

No render-blocking resources

No render-blocking resources detected

A+

Resource Hints

15 hints, 0 missing preconnects

PASS

15 hints, 0 missing preconnects

Page uses 15 resource hint(s)

Current Resource Hints

preconnect

preload

dns-prefetch

prefetch

—

15 resource hints configured

A+

Render-Blocking Resources

No render-blocking resources detected

PASS

No render-blocking resources detected

No render-blocking resources detected in <head>

A+

Third-Party Resources

No third-party resources detected

PASS

No third-party resources detected

Network Waterfall

226 requests over 11584ms

INFO

HTML JavaScript CSS Images Fonts XHR/Fetch Other

Third-Party Script Cost

Per-script blocking time, transfer cost, and cache headers

INFO

100% of JavaScript execution is third-party

First-party Third-party 22265ms · 3568KB · $127/mo

Script	Category	Execution	Transfer	Unused	Monthly Cost	Verdict
www.mercurynews.com www.mercurynews.com	Other	7649ms	10 KB	—	$44/mo	Costly
cmp.osano.com cmp.osano.com	Other	2763ms	63 KB	—	$16/mo	Costly
www.mercurynews.com www.mercurynews.com	Other	1586ms	42 KB	—	$9/mo	Costly
Unattributable Unattributable	Other	1449ms	0 KB	—	$8/mo	Costly
securepubads.g.doubleclick.net securepubads.g.doubleclick.net	Other	923ms	188 KB	69%	$5/mo	Costly
cdn.p-n.io cdn.p-n.io	Other	587ms	0 KB	—	$3/mo	Costly
cdn.adapex.io cdn.adapex.io	Other	537ms	178 KB	64%	$3/mo	Costly
connext-fd-gnbrate4fjhjb3f7.z01.azurefd.net connext-fd-gnbrate4fjhjb3f7.z01.azurefd.net	Other	441ms	3 KB	—	$3/mo	Costly
Google Tag Manager www.googletagmanager.com	Tag Manager	395ms	159 KB	39%	$2/mo	Costly
www.mercurynews.com www.mercurynews.com	Other	378ms	155 KB	81%	$2/mo	Costly
Google Tag Manager www.googletagmanager.com	Tag Manager	373ms	171 KB	38%	$2/mo	Costly
Google Tag Manager www.googletagmanager.com	Tag Manager	370ms	213 KB	26%	$2/mo	Costly
s.cdn.gcprivacy.net s.cdn.gcprivacy.net	Other	312ms	9 KB	—	$2/mo	Costly
htlbid.com htlbid.com	Other	311ms	138 KB	55%	$2/mo	Costly
Google Tag Manager www.googletagmanager.com	Tag Manager	290ms	145 KB	42%	$2/mo	Costly
sdk.mrf.io sdk.mrf.io	Other	282ms	63 KB	39%	$2/mo	Costly
engage.mercurynews.com engage.mercurynews.com	Other	274ms	292 KB	64%	$2/mo	Costly
tagan.adlightning.com tagan.adlightning.com	Other	270ms	15 KB	—	$2/mo	Costly
fundingchoicesmessages.google.com fundingchoicesmessages.google.com	Other	233ms	70 KB	54%	$1/mo	Costly
Google Tag Manager www.googletagmanager.com	Tag Manager	220ms	145 KB	40%	$1/mo	Costly
cdn.sophi.io cdn.sophi.io	Other	180ms	39 KB	—	$1/mo	Optional
jsDelivr cdn.jsdelivr.net	CDN	169ms	81 KB	47%	$1/mo	Optional
raven-static.aditude.io raven-static.aditude.io	Other	169ms	107 KB	59%	$1/mo	Optional
static.kueezrtb.com static.kueezrtb.com	Other	166ms	37 KB	—	$1/mo	Optional
az416426.vo.msecnd.net az416426.vo.msecnd.net	Other	149ms	0 KB	—	$1/mo	Optional
tagan.adlightning.com tagan.adlightning.com	Other	137ms	31 KB	—	$1/mo	Optional
fp.mercurynews.com fp.mercurynews.com	Other	134ms	23 KB	—	$1/mo	Optional
Google Tag Manager www.googletagmanager.com	Tag Manager	129ms	144 KB	50%	$1/mo	Optional
cds.connatix.com cds.connatix.com	Other	127ms	139 KB	68%	$1/mo	Optional
securepubads.g.doubleclick.net securepubads.g.doubleclick.net	Other	120ms	34 KB	70%	$1/mo	Optional
c.amazon-adsystem.com c.amazon-adsystem.com	Other	117ms	91 KB	42%	$1/mo	Optional
g2i.mercurynews.com g2i.mercurynews.com	Other	109ms	44 KB	50%	$1/mo	Optional
tagan.adlightning.com tagan.adlightning.com	Other	108ms	72 KB	—	$1/mo	Optional
www.mercurynews.com www.mercurynews.com	Other	91ms	21 KB	—	$1/mo	Optional
a869.mercurynews.com a869.mercurynews.com	Other	87ms	45 KB	—	$0/mo	Optional
cdn-p.cityspark.com cdn-p.cityspark.com	Other	83ms	21 KB	—	$0/mo	Optional
www.mercurynews.com www.mercurynews.com	Other	82ms	66 KB	77%	$0/mo	Optional
Google Tag Manager www.googletagmanager.com	Tag Manager	81ms	144 KB	44%	$0/mo	Optional
cmp.osano.com cmp.osano.com	Other	72ms	31 KB	—	$0/mo	Optional
fundingchoicesmessages.google.com fundingchoicesmessages.google.com	Other	67ms	84 KB	—	$0/mo	Optional
digitalfirstmedia.blueconic.net digitalfirstmedia.blueconic.net	Other	65ms	1 KB	—	$0/mo	Optional
thebestpaints.com thebestpaints.com	Other	65ms	36 KB	—	$0/mo	Optional
www.mercurynews.com www.mercurynews.com	Other	64ms	122 KB	—	$0/mo	Optional
accounts.google.com accounts.google.com	Other	52ms	96 KB	75%	$0/mo	Optional

www.mercurynews.com

Other

Costly

Execution 7649ms

Transfer 10 KB

Monthly Cost $44/mo

cmp.osano.com

Other

Costly

Execution 2763ms

Transfer 63 KB

Monthly Cost $16/mo

www.mercurynews.com

Other

Costly

Execution 1586ms

Transfer 42 KB

Monthly Cost $9/mo

Unattributable

Other

Costly

Execution 1449ms

Transfer 0 KB

Monthly Cost $8/mo

securepubads.g.doubleclick.net

Other

Costly

Execution 923ms

Transfer 188 KB

Unused 69%

Monthly Cost $5/mo

cdn.p-n.io

Other

Costly

Execution 587ms

Transfer 0 KB

Monthly Cost $3/mo

cdn.adapex.io

Other

Costly

Execution 537ms

Transfer 178 KB

Unused 64%

Monthly Cost $3/mo

connext-fd-gnbrate4fjhjb3f7.z01.azurefd.net

Other

Costly

Execution 441ms

Transfer 3 KB

Monthly Cost $3/mo

Google Tag Manager

Tag Manager

Costly

Execution 395ms

Transfer 159 KB

Unused 39%

Monthly Cost $2/mo

www.mercurynews.com

Other

Costly

Execution 378ms

Transfer 155 KB

Unused 81%

Monthly Cost $2/mo

Google Tag Manager

Tag Manager

Costly

Execution 373ms

Transfer 171 KB

Unused 38%

Monthly Cost $2/mo

Google Tag Manager

Tag Manager

Costly

Execution 370ms

Transfer 213 KB

Unused 26%

Monthly Cost $2/mo

s.cdn.gcprivacy.net

Other

Costly

Execution 312ms

Transfer 9 KB

Monthly Cost $2/mo

htlbid.com

Other

Costly

Execution 311ms

Transfer 138 KB

Unused 55%

Monthly Cost $2/mo

Google Tag Manager

Tag Manager

Costly

Execution 290ms

Transfer 145 KB

Unused 42%

Monthly Cost $2/mo

sdk.mrf.io

Other

Costly

Execution 282ms

Transfer 63 KB

Unused 39%

Monthly Cost $2/mo

engage.mercurynews.com

Other

Costly

Execution 274ms

Transfer 292 KB

Unused 64%

Monthly Cost $2/mo

tagan.adlightning.com

Other

Costly

Execution 270ms

Transfer 15 KB

Monthly Cost $2/mo

fundingchoicesmessages.google.com

Other

Costly

Execution 233ms

Transfer 70 KB

Unused 54%

Monthly Cost $1/mo

Google Tag Manager

Tag Manager

Costly

Execution 220ms

Transfer 145 KB

Unused 40%

Monthly Cost $1/mo

cdn.sophi.io

Other

Optional

Execution 180ms

Transfer 39 KB

Monthly Cost $1/mo

jsDelivr

CDN

Optional

Execution 169ms

Transfer 81 KB

Unused 47%

Monthly Cost $1/mo

raven-static.aditude.io

Other

Optional

Execution 169ms

Transfer 107 KB

Unused 59%

Monthly Cost $1/mo

static.kueezrtb.com

Other

Optional

Execution 166ms

Transfer 37 KB

Monthly Cost $1/mo

az416426.vo.msecnd.net

Other

Optional

Execution 149ms

Transfer 0 KB

Monthly Cost $1/mo

tagan.adlightning.com

Other

Optional

Execution 137ms

Transfer 31 KB

Monthly Cost $1/mo

fp.mercurynews.com

Other

Optional

Execution 134ms

Transfer 23 KB

Monthly Cost $1/mo

Google Tag Manager

Tag Manager

Optional

Execution 129ms

Transfer 144 KB

Unused 50%

Monthly Cost $1/mo

cds.connatix.com

Other

Optional

Execution 127ms

Transfer 139 KB

Unused 68%

Monthly Cost $1/mo

securepubads.g.doubleclick.net

Other

Optional

Execution 120ms

Transfer 34 KB

Unused 70%

Monthly Cost $1/mo

c.amazon-adsystem.com

Other

Optional

Execution 117ms

Transfer 91 KB

Unused 42%

Monthly Cost $1/mo

g2i.mercurynews.com

Other

Optional

Execution 109ms

Transfer 44 KB

Unused 50%

Monthly Cost $1/mo

tagan.adlightning.com

Other

Optional

Execution 108ms

Transfer 72 KB

Monthly Cost $1/mo

www.mercurynews.com

Other

Optional

Execution 91ms

Transfer 21 KB

Monthly Cost $1/mo

a869.mercurynews.com

Other

Optional

Execution 87ms

Transfer 45 KB

Monthly Cost $0/mo

cdn-p.cityspark.com

Other

Optional

Execution 83ms

Transfer 21 KB

Monthly Cost $0/mo

www.mercurynews.com

Other

Optional

Execution 82ms

Transfer 66 KB

Unused 77%

Monthly Cost $0/mo

Google Tag Manager

Tag Manager

Optional

Execution 81ms

Transfer 144 KB

Unused 44%

Monthly Cost $0/mo

cmp.osano.com

Other

Optional

Execution 72ms

Transfer 31 KB

Monthly Cost $0/mo

fundingchoicesmessages.google.com

Other

Optional

Execution 67ms

Transfer 84 KB

Monthly Cost $0/mo

digitalfirstmedia.blueconic.net

Other

Optional

Execution 65ms

Transfer 1 KB

Monthly Cost $0/mo

thebestpaints.com

Other

Optional

Execution 65ms

Transfer 36 KB

Monthly Cost $0/mo

www.mercurynews.com

Other

Optional

Execution 64ms

Transfer 122 KB

Monthly Cost $0/mo

accounts.google.com

Other

Optional

Execution 52ms

Transfer 96 KB

Unused 75%

Monthly Cost $0/mo

These scripts may cost more than they're worth

www.mercurynews.com adds 7649ms and costs ~$44/month
cmp.osano.com adds 2763ms and costs ~$16/month
www.mercurynews.com adds 1586ms and costs ~$9/month
Unattributable adds 1449ms and costs ~$8/month
securepubads.g.doubleclick.net adds 923ms and costs ~$5/month
cdn.p-n.io adds 587ms and costs ~$3/month
cdn.adapex.io adds 537ms and costs ~$3/month
connext-fd-gnbrate4fjhjb3f7.z01.azurefd.net adds 441ms and costs ~$3/month
Google Tag Manager adds 395ms and costs ~$2/month
www.mercurynews.com adds 378ms and costs ~$2/month
Google Tag Manager adds 373ms and costs ~$2/month
Google Tag Manager adds 370ms and costs ~$2/month
s.cdn.gcprivacy.net adds 312ms and costs ~$2/month
htlbid.com adds 311ms and costs ~$2/month
Google Tag Manager adds 290ms and costs ~$2/month
sdk.mrf.io adds 282ms and costs ~$2/month
engage.mercurynews.com adds 274ms and costs ~$2/month
tagan.adlightning.com adds 270ms and costs ~$2/month
fundingchoicesmessages.google.com adds 233ms and costs ~$1/month
Google Tag Manager adds 220ms and costs ~$1/month

100% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.

Why this matters

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.mercurynews.com takes 7649ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

cmp.osano.com takes 2763ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

www.mercurynews.com takes 1586ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

Unattributable takes 1449ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

securepubads.g.doubleclick.net takes 923ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

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.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

cdn.p-n.io takes 587ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

cdn.adapex.io takes 537ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

64% of cdn.adapex.io's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

connext-fd-gnbrate4fjhjb3f7.z01.azurefd.net takes 441ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

Google Tag Manager takes 395ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

www.mercurynews.com takes 378ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

81% of www.mercurynews.com's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

Google Tag Manager takes 373ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

Google Tag Manager takes 370ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

s.cdn.gcprivacy.net takes 312ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

htlbid.com takes 311ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

55% of htlbid.com's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

Google Tag Manager takes 290ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

sdk.mrf.io takes 282ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

engage.mercurynews.com takes 274ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

64% of engage.mercurynews.com's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

tagan.adlightning.com takes 270ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

fundingchoicesmessages.google.com takes 233ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

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.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

Google Tag Manager takes 220ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

50% of g2i.mercurynews.com's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

77% of www.mercurynews.com's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

75% of accounts.google.com's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

How third-party costs are calculated

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.