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https://grc.com

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
76
GRADE
C
FIX
4
REVIEW
4
PASS
5
INFO
2

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

Mobile Desktop
96
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
84
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
92
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
92
SEO Measures basic SEO optimizations: meta tags, crawlability, link text, and mobile friendliness.

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

834 ms

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

1.22 s

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

4 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.

926 ms

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

1.48 s

Page Load Progression

375 ms
750 ms
1.1 s
1.5 s
1.9 s
2.2 s
2.6 s
3.0 s
Checks
15
5 PASS 4 REVIEW 4 FIX
F
Page Weight Budget
Action
4.1 MB transferred, 45 requests
FIX
4.1 MB transferred, 45 requests
Critical::
Page weighs 4.8 MB (4.1 MB transferred)
Info::
45 HTTP requests
Info::
Estimated 0.86 g CO2 per page load
4.1 MB / 2.4 MB budget
4.1 MB transferred
45 requests
0.86 g CO2 per page load
Other 3.6 MiB 89%
JavaScript 337.2 KiB 8%
Images 79.3 KiB 2%
CSS 23.0 KiB 1%
Other 15.4 KiB 0%
HTML 10.1 KiB 0%
Other 7.9 KiB 0%
Other 3.4 KiB 0%
Other 546 B 0%
0 2.4 MB 4.9 MB
Over budget
D
Third-Party Impact
Action
100% third-party, 0 ms blocking
FIX
100% third-party, 0 ms blocking
Warning::
Third-party code accounts for 100% of page weight (4.1 MiB of 4.1 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
Page Weight Inventory
Action
45 resources · 4.1 MB · 147 KB savings available
FIX
45 resources · 4.1 MB · 147 KB savings available
Warning::
Page weight 3.1 MB over 1MB target
Got: 4.1 MB Expected: ≤ 1 MB
Info::
~147 KB of savings available
Warning::
44 third-party resources (100% of weight)
Info::
1 resources over 200KB
45 resources · 4.1 MiB · 44 third-party 3.1 MiB over 1MB target
Media 89% · 3.6 MiB
JavaScript 8% · 337.2 KiB
Image 2% · 94.4 KiB
CSS 1% · 23.0 KiB
Document 0% · 13.5 KiB
Other 0% · 8.7 KiB

~147.2 KiB of savings available

Remove unused JavaScript: 147.2 KiB
F
HTTP Caching
Action
No cache headers
FIX
No cache headers
Warning::
No Cache-Control header found
Browsers will use heuristic caching, which can be unpredictable. Set explicit cache headers.

No Cache-Control header

Adding a Cache-Control header can significantly improve repeat-visit performance.

B
Image Optimization
21 images, 0 KB saveable
REVIEW
21 images, 0 KB saveable
Info::
All images are well-optimized
21 images 79 KB
0 oversized -0 KB
17 legacy format
0 missing dimensions CLS risk
B
JS Execution Cost
566ms total JS execution
REVIEW
566ms total JS execution
Info::
https://www.grc.com/intro.htm: 220ms CPU time
Info::
Unattributable: 177ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-GS3M...: 115ms CPU time
Info::
https://cse.google.com/cse.js?cx=00006455229118198...: 54ms CPU time
Warning::
Third-party scripts: 566ms (100% of total)

Main Thread Breakdown

Other 41% Script Evaluation 27% Style & Layout 17% Rendering 8% Script Parsing & Compilation 5%
ScriptTotalScriptingParse/CompileParty
https://www.grc.com/intro.htm220ms2ms0ms3rd
Unattributable177ms5ms0ms3rd
https://www.googletagmanager.com/gtag/js?id=G-GS3MK15LN5115ms99ms14ms3rd
https://cse.google.com/cse.js?cx=000064552291181981813:y8yi5go2xza54ms38ms0ms3rd
B
JS Bundles
6 scripts, 147 KB unused
REVIEW
6 scripts, 147 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-GS3M...: 63 KB unused (40%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.google.com/cse/static/element/dc329f57...: 52 KB unused (51%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cse.google.com/adsense/search/async-ads.js: 32 KB unused (73%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 147 KB
147 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-GS3MK15LN5157 KB63 KB (40%)✓3rd
https://www.google.com/cse/static/element/dc329f57de078f5d/cse_element__en.js?usqp=CAM%3D103 KB52 KB (51%)✓3rd
https://cse.google.com/adsense/search/async-ads.js44 KB32 KB (73%)✓3rd
https://cse.google.com/cse.js?cx=000064552291181981813:y8yi5go2xza4 KB—✓3rd
https://ep2.adtrafficquality.google/sodar/sodar2.js8 KB—✓3rd
https://pagead2.googlesyndication.com/bg/gHgVpHNo6dn0XHhe-kL49krin5JQn9VQtx09w0rxLvA.js22 KB—✓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

C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Text Compression
All text resources are compressed
PASS
All text resources are compressed
Info::
All text resources are compressed
All text resources are properly compressed.
A+
Font Loading
No web fonts (system fonts)
PASS
No web fonts (system fonts)
Info::
No web fonts loaded — system fonts are fastest
No web fonts loaded — system fonts are optimal.
A+
Resource Caching
All resources properly cached
PASS
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+
Critical Rendering Path
No render-blocking resources
PASS
No render-blocking resources
Info::
No render-blocking resources detected
A+
Resource Hints
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
Network Waterfall
45 requests over 2332ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 834 ms LCP 1.2 shttps://grc.com// https://grc.com/ — 301 — 292 B — 330 ms — http/1.1https://www.grc.com/intro.htmwww.grc.com/intro.htm https://www.grc.com/intro.htm — 200 — 4.4 KiB — 155 ms — http/1.1https://www.grc.com/grc.css?3www.grc.com/grc.css?3 https://www.grc.com/grc.css?3 — 200 — 3.9 KiB — 87 ms — http/1.1https://www.grc.com/search.csswww.grc.com/search.css https://www.grc.com/search.css — 200 — 836 B — 102 ms — http/1.1https://www.grc.com/mainmenu.css?2www.grc.com/mainmenu.css?2 https://www.grc.com/mainmenu.css?2 — 200 — 3.6 KiB — 104 ms — http/1.1https://www.grc.com/webfonts.csswww.grc.com/webfonts.css https://www.grc.com/webfonts.css — 200 — 1.5 KiB — 103 ms — http/1.1https://www.grc.com/image/walkthrough.pngwww.grc.com/image/walkthrough.png https://www.grc.com/image/walkthrough.png — 200 — 44.2 KiB — 152 ms — http/1.1https://www.grctech.com/_5edoiiyfx145d_/image/su2blackglow.gifwww.grctech.com/_5edoiiyfx145d_/ima... https://www.grctech.com/_5edoiiyfx145d_/image/su2blackglow.gif — 200 — 13.7 KiB — 216 ms — http/1.1https://www.googletagmanager.com/gtag/js?id=G-GS3MK15LN5www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-GS3MK15LN5 — 200 — 157.2 KiB — 106 ms — h2https://www.grc.com/mh-logo.gifwww.grc.com/mh-logo.gif https://www.grc.com/mh-logo.gif — 200 — 3.2 KiB — 120 ms — http/1.1https://cse.google.com/cse.js?cx=000064552291181981813:y8yi5go2xzacse.google.com/cse.js?cx=0000645522... https://cse.google.com/cse.js?cx=000064552291181981813:y8yi5go2xza — 200 — 4.0 KiB — 69 ms — h2https://www.grc.com/manifest.jsonwww.grc.com/manifest.json https://www.grc.com/manifest.json — 404 — 1.7 KiB — 111 ms — http/1.1https://www.grc.com/mh-focus.gifwww.grc.com/mh-focus.gif https://www.grc.com/mh-focus.gif — 200 — 5.6 KiB — 28 ms — http/1.1https://www.grc.com/image/email-subscriptions.pngwww.grc.com/image/email-subscriptio... https://www.grc.com/image/email-subscriptions.png — 200 — 2.4 KiB — 23 ms — http/1.1https://www.grc.com/mb-home.gifwww.grc.com/mb-home.gif https://www.grc.com/mb-home.gif — 200 — 1004 B — 26 ms — http/1.1data:image/svg+xml;base64,PD94bWwgdmVyc2lvbj0iMS4wIiBlbmNvZGluZz0idXRmLTgiPz4KPHN2ZyB2ZXJzaW9uPSIxL…data:image/svg+xml;base64,PD94bWwgd... data:image/svg+xml;base64,PD94bWwgdmVyc2lvbj0iMS4wIiBlbmNvZGluZz0idXRmLTgiPz4KPHN2ZyB2ZXJzaW9uPSIxL… — 200 — 0 B — 0 ms — datahttps://www.grc.com/mb_products.gifwww.grc.com/mb_products.gif https://www.grc.com/mb_products.gif — 200 — 1.3 KiB — 67 ms — http/1.1https://www.grc.com/mb-services.gifwww.grc.com/mb-services.gif https://www.grc.com/mb-services.gif — 200 — 1.4 KiB — 65 ms — http/1.1https://www.grc.com/mb-freeware.gifwww.grc.com/mb-freeware.gif https://www.grc.com/mb-freeware.gif — 200 — 1.1 KiB — 67 ms — http/1.1https://www.grc.com/mb-research.gifwww.grc.com/mb-research.gif https://www.grc.com/mb-research.gif — 200 — 1.4 KiB — 62 ms — http/1.1https://www.grc.com/mb-other.gifwww.grc.com/mb-other.gif https://www.grc.com/mb-other.gif — 200 — 1.0 KiB — 48 ms — http/1.1https://www.grc.com/image/transpixel.gifwww.grc.com/image/transpixel.gif https://www.grc.com/image/transpixel.gif — 200 — 405 B — 48 ms — http/1.1https://media.grc.com/video/Walkthrough.mp4media.grc.com/video/Walkthrough.mp4 https://media.grc.com/video/Walkthrough.mp4 — 206 — 3.6 MiB — 173 ms — http/1.1data:image/svg+xml;base64,PD94bWwgdmVyc2lvbj0iMS4wIiBlbmNvZGluZz0idXRmLTgiPz4KPCEtLSBHZW5lcmF0b3I6I…data:image/svg+xml;base64,PD94bWwgd... data:image/svg+xml;base64,PD94bWwgdmVyc2lvbj0iMS4wIiBlbmNvZGluZz0idXRmLTgiPz4KPCEtLSBHZW5lcmF0b3I6I… — 200 — 0 B — 0 ms — datadata:image/svg+xml;base64,PD94bWwgdmVyc2lvbj0iMS4wIiBlbmNvZGluZz0idXRmLTgiPz4KPCEtLSBHZW5lcmF0b3I6I…data:image/svg+xml;base64,PD94bWwgd... data:image/svg+xml;base64,PD94bWwgdmVyc2lvbj0iMS4wIiBlbmNvZGluZz0idXRmLTgiPz4KPCEtLSBHZW5lcmF0b3I6I… — 200 — 0 B — 0 ms — datadata:image/svg+xml;base64,PHN2ZyBmaWxsPSJXaW5kb3ciIGhlaWdodD0iMjQiIHZpZXdCb3g9IjAgMCAyNCAyNCIgd2lkd…data:image/svg+xml;base64,PHN2ZyBma... data:image/svg+xml;base64,PHN2ZyBmaWxsPSJXaW5kb3ciIGhlaWdodD0iMjQiIHZpZXdCb3g9IjAgMCAyNCAyNCIgd2lkd… — 200 — 0 B — 0 ms — datadata:image/svg+xml;base64,PHN2ZyBmaWxsPSJXaW5kb3ciIGhlaWdodD0iMjQiIHZpZXdCb3g9IjAgMCAyNCAyNCIgd2lkd…data:image/svg+xml;base64,PHN2ZyBma... data:image/svg+xml;base64,PHN2ZyBmaWxsPSJXaW5kb3ciIGhlaWdodD0iMjQiIHZpZXdCb3g9IjAgMCAyNCAyNCIgd2lkd… — 200 — 0 B — 0 ms — datadata:image/svg+xml;base64,PHN2ZyBmaWxsPSJXaW5kb3ciIGhlaWdodD0iMjQiIHZpZXdCb3g9IjAgMCAyNCAyNCIgd2lkd…data:image/svg+xml;base64,PHN2ZyBma... data:image/svg+xml;base64,PHN2ZyBmaWxsPSJXaW5kb3ciIGhlaWdodD0iMjQiIHZpZXdCb3g9IjAgMCAyNCAyNCIgd2lkd… — 200 — 0 B — 0 ms — datahttps://www.google.com/cse/static/element/dc329f57de078f5d/cse_element__en.js?usqp=CAM%3Dwww.google.com/cse/static/element/d... https://www.google.com/cse/static/element/dc329f57de078f5d/cse_element__en.js?usqp=CAM%3D — 200 — 102.7 KiB — 80 ms — h3https://www.google.com/cse/static/element/dc329f57de078f5d/default_v6+en.csswww.google.com/cse/static/element/d... https://www.google.com/cse/static/element/dc329f57de078f5d/default_v6+en.css — 200 — 12.0 KiB — 57 ms — h3
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 834 ms LCP 1.2 shttps://grc.com// https://grc.com/ — 301 — 292 B — 330 ms — http/1.1https://www.grc.com/intro.htmwww.grc.com/intro.htm https://www.grc.com/intro.htm — 200 — 4.4 KiB — 155 ms — http/1.1https://www.grc.com/grc.css?3www.grc.com/grc.css?3 https://www.grc.com/grc.css?3 — 200 — 3.9 KiB — 87 ms — http/1.1https://www.grc.com/search.csswww.grc.com/search.css https://www.grc.com/search.css — 200 — 836 B — 102 ms — http/1.1https://www.grc.com/mainmenu.css?2www.grc.com/mainmenu.css?2 https://www.grc.com/mainmenu.css?2 — 200 — 3.6 KiB — 104 ms — http/1.1https://www.grc.com/webfonts.csswww.grc.com/webfonts.css https://www.grc.com/webfonts.css — 200 — 1.5 KiB — 103 ms — http/1.1https://www.grc.com/image/walkthrough.pngwww.grc.com/image/walkthrough.png https://www.grc.com/image/walkthrough.png — 200 — 44.2 KiB — 152 ms — http/1.1https://www.grctech.com/_5edoiiyfx145d_/image/su2blackglow.gifwww.grctech.com/_5edoiiyfx145d_/ima... https://www.grctech.com/_5edoiiyfx145d_/image/su2blackglow.gif — 200 — 13.7 KiB — 216 ms — http/1.1https://www.googletagmanager.com/gtag/js?id=G-GS3MK15LN5www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-GS3MK15LN5 — 200 — 157.2 KiB — 106 ms — h2https://www.grc.com/mh-logo.gifwww.grc.com/mh-logo.gif https://www.grc.com/mh-logo.gif — 200 — 3.2 KiB — 120 ms — http/1.1https://cse.google.com/cse.js?cx=000064552291181981813:y8yi5go2xzacse.google.com/cse.js?cx=0000645522... https://cse.google.com/cse.js?cx=000064552291181981813:y8yi5go2xza — 200 — 4.0 KiB — 69 ms — h2https://www.grc.com/manifest.jsonwww.grc.com/manifest.json https://www.grc.com/manifest.json — 404 — 1.7 KiB — 111 ms — http/1.1https://www.grc.com/mh-focus.gifwww.grc.com/mh-focus.gif https://www.grc.com/mh-focus.gif — 200 — 5.6 KiB — 28 ms — http/1.1https://www.grc.com/image/email-subscriptions.pngwww.grc.com/image/email-subscriptio... https://www.grc.com/image/email-subscriptions.png — 200 — 2.4 KiB — 23 ms — http/1.1https://www.grc.com/mb-home.gifwww.grc.com/mb-home.gif https://www.grc.com/mb-home.gif — 200 — 1004 B — 26 ms — http/1.1data:image/svg+xml;base64,PD94bWwgdmVyc2lvbj0iMS4wIiBlbmNvZGluZz0idXRmLTgiPz4KPHN2ZyB2ZXJzaW9uPSIxL…data:image/svg+xml;base64,PD94bWwgd... data:image/svg+xml;base64,PD94bWwgdmVyc2lvbj0iMS4wIiBlbmNvZGluZz0idXRmLTgiPz4KPHN2ZyB2ZXJzaW9uPSIxL… — 200 — 0 B — 0 ms — datahttps://www.grc.com/mb_products.gifwww.grc.com/mb_products.gif https://www.grc.com/mb_products.gif — 200 — 1.3 KiB — 67 ms — http/1.1https://www.grc.com/mb-services.gifwww.grc.com/mb-services.gif https://www.grc.com/mb-services.gif — 200 — 1.4 KiB — 65 ms — http/1.1https://www.grc.com/mb-freeware.gifwww.grc.com/mb-freeware.gif https://www.grc.com/mb-freeware.gif — 200 — 1.1 KiB — 67 ms — http/1.1https://www.grc.com/mb-research.gifwww.grc.com/mb-research.gif https://www.grc.com/mb-research.gif — 200 — 1.4 KiB — 62 ms — http/1.1https://www.grc.com/mb-other.gifwww.grc.com/mb-other.gif https://www.grc.com/mb-other.gif — 200 — 1.0 KiB — 48 ms — http/1.1https://www.grc.com/image/transpixel.gifwww.grc.com/image/transpixel.gif https://www.grc.com/image/transpixel.gif — 200 — 405 B — 48 ms — http/1.1https://media.grc.com/video/Walkthrough.mp4media.grc.com/video/Walkthrough.mp4 https://media.grc.com/video/Walkthrough.mp4 — 206 — 3.6 MiB — 173 ms — http/1.1data:image/svg+xml;base64,PD94bWwgdmVyc2lvbj0iMS4wIiBlbmNvZGluZz0idXRmLTgiPz4KPCEtLSBHZW5lcmF0b3I6I…data:image/svg+xml;base64,PD94bWwgd... data:image/svg+xml;base64,PD94bWwgdmVyc2lvbj0iMS4wIiBlbmNvZGluZz0idXRmLTgiPz4KPCEtLSBHZW5lcmF0b3I6I… — 200 — 0 B — 0 ms — datadata:image/svg+xml;base64,PD94bWwgdmVyc2lvbj0iMS4wIiBlbmNvZGluZz0idXRmLTgiPz4KPCEtLSBHZW5lcmF0b3I6I…data:image/svg+xml;base64,PD94bWwgd... data:image/svg+xml;base64,PD94bWwgdmVyc2lvbj0iMS4wIiBlbmNvZGluZz0idXRmLTgiPz4KPCEtLSBHZW5lcmF0b3I6I… — 200 — 0 B — 0 ms — datadata:image/svg+xml;base64,PHN2ZyBmaWxsPSJXaW5kb3ciIGhlaWdodD0iMjQiIHZpZXdCb3g9IjAgMCAyNCAyNCIgd2lkd…data:image/svg+xml;base64,PHN2ZyBma... data:image/svg+xml;base64,PHN2ZyBmaWxsPSJXaW5kb3ciIGhlaWdodD0iMjQiIHZpZXdCb3g9IjAgMCAyNCAyNCIgd2lkd… — 200 — 0 B — 0 ms — datadata:image/svg+xml;base64,PHN2ZyBmaWxsPSJXaW5kb3ciIGhlaWdodD0iMjQiIHZpZXdCb3g9IjAgMCAyNCAyNCIgd2lkd…data:image/svg+xml;base64,PHN2ZyBma... data:image/svg+xml;base64,PHN2ZyBmaWxsPSJXaW5kb3ciIGhlaWdodD0iMjQiIHZpZXdCb3g9IjAgMCAyNCAyNCIgd2lkd… — 200 — 0 B — 0 ms — datadata:image/svg+xml;base64,PHN2ZyBmaWxsPSJXaW5kb3ciIGhlaWdodD0iMjQiIHZpZXdCb3g9IjAgMCAyNCAyNCIgd2lkd…data:image/svg+xml;base64,PHN2ZyBma... data:image/svg+xml;base64,PHN2ZyBmaWxsPSJXaW5kb3ciIGhlaWdodD0iMjQiIHZpZXdCb3g9IjAgMCAyNCAyNCIgd2lkd… — 200 — 0 B — 0 ms — datahttps://www.google.com/cse/static/element/dc329f57de078f5d/cse_element__en.js?usqp=CAM%3Dwww.google.com/cse/static/element/d... https://www.google.com/cse/static/element/dc329f57de078f5d/cse_element__en.js?usqp=CAM%3D — 200 — 102.7 KiB — 80 ms — h3https://www.google.com/cse/static/element/dc329f57de078f5d/default_v6+en.csswww.google.com/cse/static/element/d... https://www.google.com/cse/static/element/dc329f57de078f5d/default_v6+en.css — 200 — 12.0 KiB — 57 ms — h3https://www.google.com/cse/static/style/look/v6/default.csswww.google.com/cse/static/style/loo... https://www.google.com/cse/static/style/look/v6/default.css — 200 — 1.2 KiB — 35 ms — h3https://www.google-analytics.com/g/collect?v=2&tid=G-GS3MK15LN5&gtm=45je64k1h1v9194581884za200zd9194581884&_p=1776902014541&gcd=13l3l3l3l1l1&npa=0&dma=0&are=1&cid=935930763.1776902015&frm=0&pscdl=noapi&rcb=3&sr=800x600&uaa=x86&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=1&tag_exp=0~115938466~115938468~117266401~117384405~117512542&sid=1776902014&sct=1&seg=0&dl=https%3A%2F%2Fwww.grc.com%2Fintro.htm&dt=%C2%A0%C2%A0Home%20of%20Gibson%20Research%20Corporation%C2%A0%C2%A0&en=page_view&_fv=1&_nsi=1&_ss=1&_ee=1&tfd=830www.google-analytics.com/g/collect?... 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— 204 — 17 B — 42 ms — h3
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 566ms · 166KB · $8/mo
www.grc.com
Other
Costly
Execution 220ms
Transfer 4 KB
Monthly Cost $3/mo
Unattributable
Other
Optional
Execution 177ms
Transfer 0 KB
Monthly Cost $2/mo
Google Tag Manager
Tag Manager
Optional
Execution 115ms
Transfer 157 KB
Unused 40%
Monthly Cost $2/mo
cse.google.com
Other
Optional
Execution 54ms
Transfer 4 KB
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • www.grc.com adds 220ms and costs ~$3/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.grc.com 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

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.

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