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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
65
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
95
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
100
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
100
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.

2.08 s

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

3.19 s

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

27 ms

Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.

0.120

Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.

2.58 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.

3.39 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
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 (1.6 MiB of 1.6 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Bundles
Action
16 scripts, 445 KB unused
FIX
16 scripts, 445 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-CSLL...: 106 KB unused (72%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-ZY6F...: 63 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-CSLL...: 62 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-KV9...: 57 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.irs.gov/pub/js/js_uQ3AXRedwNs815Y7AO31...: 48 KB unused (71%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 445 KB
445 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L&cx=c&gtm=4e64f0147 KB106 KB (72%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-ZY6FM95CS5&cx=c&gtm=4e64f0153 KB63 KB (41%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L147 KB62 KB (42%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-KV978ZL139 KB57 KB (41%)✓3rd
https://www.irs.gov/pub/js/js_uQ3AXRedwNs815Y7AO31iI36vlbr_6NIRZCoLu8BbEY.js?scope=footer&delta=2&language=en&theme=pup_irs&include=eJx1kWGSwyAIhS9k4pEcVGrYGnEQu-3tN2k3abLT_SO876GCQggskbi4GUtvFs7afVNMqAZiVIbysFsyXoSLGs-sTQWq3TNXBR0VOpqVK99QDkSZs1I1YeKGxb7C6PGykSi9Qh5fykRQyPBAsR4nuBFLM3jXTOW6Vf5Kk5hTRqeQbFqWv3qEL7if4Wxqr26ZHFsjT5l0nXOm4tYuPcjT99DQpswe8tBIcbggaBdsTzdcMZKyuJp7onJ4yM_2J_isJGn7LUGo6hvPoGEaJqQ06RtigmH9qwMp_dzcSpc4TDxjhYRDAOHeMO9uQ5Dl7H3XSzuo5KArB55rRkX7D_8Bj-nlkA67 KB48 KB (71%)✓3rd
https://resources.digital-cloud-gov.medallia.com/wdcgov/20103/onsite/generic1776352584096.js82 KB47 KB (57%)✓3rd
https://www.irs.gov/pub/js/js_w8fM3HiCn-P-n7TMi9seyjEJrCmAhX-z8-63A6hCyVU.js?scope=footer&delta=0&language=en&theme=pup_irs&include=eJx1kWGSwyAIhS9k4pEcVGrYGnEQu-3tN2k3abLT_SO876GCQggskbi4GUtvFs7afVNMqAZiVIbysFsyXoSLGs-sTQWq3TNXBR0VOpqVK99QDkSZs1I1YeKGxb7C6PGykSi9Qh5fykRQyPBAsR4nuBFLM3jXTOW6Vf5Kk5hTRqeQbFqWv3qEL7if4Wxqr26ZHFsjT5l0nXOm4tYuPcjT99DQpswe8tBIcbggaBdsTzdcMZKyuJp7onJ4yM_2J_isJGn7LUGo6hvPoGEaJqQ06RtigmH9qwMp_dzcSpc4TDxjhYRDAOHeMO9uQ5Dl7H3XSzuo5KArB55rRkX7D_8Bj-nlkA52 KB22 KB (42%)✓3rd
https://static.addtoany.com/menu/modules/core.ydpp7jcu.js26 KB21 KB (82%)✓3rd
https://www.irs.gov/static_assets/js/libs/jquery.min.js30 KB20 KB (69%)✓3rd
https://www.irs.gov/pub/js/js_KDJrWUHMfAKem9afv9zeDu0oqcEh3pcAadDZ4AT7VL4.js?scope=header&delta=0&language=en&theme=pup_irs&include=eJx1kWGSwyAIhS9k4pEcVGrYGnEQu-3tN2k3abLT_SO876GCQggskbi4GUtvFs7afVNMqAZiVIbysFsyXoSLGs-sTQWq3TNXBR0VOpqVK99QDkSZs1I1YeKGxb7C6PGykSi9Qh5fykRQyPBAsR4nuBFLM3jXTOW6Vf5Kk5hTRqeQbFqWv3qEL7if4Wxqr26ZHFsjT5l0nXOm4tYuPcjT99DQpswe8tBIcbggaBdsTzdcMZKyuJp7onJ4yM_2J_isJGn7LUGo6hvPoGEaJqQ06RtigmH9qwMp_dzcSpc4TDxjhYRDAOHeMO9uQ5Dl7H3XSzuo5KArB55rRkX7D_8Bj-nlkA1 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

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

F
Page Weight Inventory
Action
52 resources · 1.6 MB · 445 KB savings available
FIX
52 resources · 1.6 MB · 445 KB savings available
Warning::
Page weight 574 KB over 1MB target
Got: 1.6 MB Expected: ≤ 1 MB
Info::
~445 KB of savings available
Warning::
51 third-party resources (100% of weight)
52 resources · 1.6 MiB · 51 third-party 573.7 KiB over 1MB target
JavaScript 54% · 863.0 KiB
Image 21% · 337.9 KiB
Font 18% · 289.6 KiB
CSS 6% · 88.0 KiB
Document 1% · 18.6 KiB
Other 0% · 764 B

~445.0 KiB of savings available

Remove unused JavaScript: 445.0 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.

C
Page Weight Budget
Action
1.6 MB transferred, 52 requests
REVIEW
1.6 MB transferred, 52 requests
Info::
Page weighs 4.3 MB (1.6 MB transferred)
Warning::
JavaScript is 863 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 863 KB
Info::
Fonts are 290 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 290 KB
Info::
52 HTTP requests
Info::
Estimated 0.33 g CO2 per page load
1.6 MB / 2.4 MB budget
1.6 MB transferred
52 requests
0.33 g CO2 per page load
JavaScript 863.0 KiB 54%
Images 336.7 KiB 21%
Fonts 289.6 KiB 18%
CSS 88.0 KiB 6%
HTML 18.6 KiB 1%
Other 1.3 KiB 0%
Other 595 B 0%
0 2.4 MB 4.9 MB
Approaching limit

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

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

C
Image Optimization
Action
23 images, 0 KB saveable
REVIEW
23 images, 0 KB saveable
Warning::
https://www.irs.gov/pub/image/homepage-tools-TAC-l... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.irs.gov/pub/image/hp-parents-baby.jpg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.irs.gov/pub/image/obba-7.jpg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.irs.gov/pub/image/woman-on-laptop.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.irs.gov/themes/custom/pup_base/IRS-Log... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.irs.gov/pub/homepage-tools-free-file-l... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.irs.gov/pub/image/1205-Where%27sMyRefu... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.irs.gov/pub/image/hp-small-business-we... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.irs.gov/pub/Mother-father-daughter-usi... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.irs.gov/themes/custom/pup_base/images/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.irs.gov/pub/image/OLA-desktop-250-208.... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.irs.gov/pub/image/DUT-homepage-tools.j... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.irs.gov/pub/image/get-a-jump-on-your-t... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.irs.gov/pub/image/vita-recruit-hpsize.... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.irs.gov/pub/image/scamhomepage.jpg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
23 images 337 KB
0 oversized -0 KB
23 legacy format
15 missing dimensions CLS risk

Set explicit width and height to prevent CLS.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

B
JS Execution Cost
569ms total JS execution
REVIEW
569ms total JS execution
Info::
https://www.irs.gov/pub/js/js_w8fM3HiCn-P-n7TMi9se...: 184ms CPU time
Info::
Unattributable: 97ms CPU time
Info::
https://www.irs.gov/: 81ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-ZY6F...: 77ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-KV9...: 73ms CPU time
Warning::
Third-party scripts: 569ms (100% of total)

Main Thread Breakdown

Script Evaluation 46% Other 19% Style & Layout 17% Script Parsing & Compilation 11% Parse HTML & CSS 3%
ScriptTotalScriptingParse/CompileParty
https://www.irs.gov/pub/js/js_w8fM3HiCn-P-n7TMi9seyjEJrCmAhX-z8-63A6hCyVU.js?scope=footer&delta=0&language=en&theme=pup_irs&include=eJx1kWGSwyAIhS9k4pEcVGrYGnEQu-3tN2k3abLT_SO876GCQggskbi4GUtvFs7afVNMqAZiVIbysFsyXoSLGs-sTQWq3TNXBR0VOpqVK99QDkSZs1I1YeKGxb7C6PGykSi9Qh5fykRQyPBAsR4nuBFLM3jXTOW6Vf5Kk5hTRqeQbFqWv3qEL7if4Wxqr26ZHFsjT5l0nXOm4tYuPcjT99DQpswe8tBIcbggaBdsTzdcMZKyuJp7onJ4yM_2J_isJGn7LUGo6hvPoGEaJqQ06RtigmH9qwMp_dzcSpc4TDxjhYRDAOHeMO9uQ5Dl7H3XSzuo5KArB55rRkX7D_8Bj-nlkA184ms81ms4ms3rd
Unattributable97ms3ms0ms3rd
https://www.irs.gov/81ms2ms1ms3rd
https://www.googletagmanager.com/gtag/js?id=G-ZY6FM95CS5&cx=c&gtm=4e64f077ms62ms15ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-KV978ZL73ms56ms14ms3rd
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L59ms49ms9ms3rd
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
3 fonts (290 KB)
PASS
3 fonts (290 KB)
Info::
3 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

3

290 KB total

Render-blocking

0

of 3

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 1.0 s 2.0 s 3.0 s FCP 2.1 s LCP 3.2 shttps://www.irs.gov/themes/custom/pup_base/fonts/source-sans-pro/fonts/sourcesans3-regular.woff2sourcesans3-regular.woff2 https://www.irs.gov/themes/custom/pup_base/fonts/source-sans-pro/fonts/sourcesans3-regular.woff2 — 107.4 KiB — 320 ms — font-display: swaphttps://www.irs.gov/themes/custom/pup_base/fonts/source-sans-pro/fonts/sourcesans3-bold.woff2sourcesans3-bold.woff2 https://www.irs.gov/themes/custom/pup_base/fonts/source-sans-pro/fonts/sourcesans3-bold.woff2 — 106.4 KiB — 354 ms — font-display: swaphttps://www.irs.gov/themes/custom/pup_base/fonts/fontawesome-webfont.woff2?v=4.7.0fontawesome-webfont.woff2 https://www.irs.gov/themes/custom/pup_base/fonts/fontawesome-webfont.woff2?v=4.7.0 — 75.7 KiB — 365 ms — font-display: swap
sourcesans3-regular.woff2 woff2 swap
Size 107 KB
Load time 320 ms
Start 1.6 s
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
sourcesans3-bold.woff2 woff2 swap
Size 106 KB
Load time 354 ms
Start 1.6 s
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
fontawesome-webfont.woff2 woff2 swap
Size 76 KB
Load time 365 ms
Start 1.6 s
Risk FOUT — text flashes from fallback to web font
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 ~107 KB and ~214 ms

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
52 requests over 2474ms
INFO
0 ms 1.0 s 2.0 s 3.0 s FCP 2.1 s LCP 3.2 shttps://irs.gov// https://irs.gov/ — 301 — 169 B — 812 ms — http/1.0https://www.irs.gov/www.irs.gov/ https://www.irs.gov/ — 200 — 17.6 KiB — 440 ms — h2https://www.irs.gov/pub/css/css_NVvP9_xN__Mg2RByu9OI--5ZTpMmH8LC8b-qER6dfbU.css?delta=0&language=en&theme=pup_irs&include=eJx1kGtuxDAIhC9kx0eyiE0TtMRYYO82t282j7ZbbX_BfIwGAaQkmklKXLB0C_Cq44PyhM1Bzk2grOFqhg-V0lyaxbCErL0CD4c6YWQaw9EOycxleRQWyBsvt8gwIqOGi_on9Sf1bcYFHX62J73ST-kqKEwKdbZr8kOGXmofmWzG7GqvMd0wUxONlftE5deB78fv4O6cWEbgaKh3SngY_7DdR7rvQDMaGb0xpZtPoNIN-duxf89Xpe2HFzvSvLV1O3PasdFSGbfScIEaXmWUO6pS3hYbgqY5QqUIvUmSp69h-Ic7W22LCCMYfgHThcvmwww.irs.gov/pub/css/css_NVvP9_xN__M... https://www.irs.gov/pub/css/css_NVvP9_xN__Mg2RByu9OI--5ZTpMmH8LC8b-qER6dfbU.css?delta=0&language=en&theme=pup_irs&include=eJx1kGtuxDAIhC9kx0eyiE0TtMRYYO82t282j7ZbbX_BfIwGAaQkmklKXLB0C_Cq44PyhM1Bzk2grOFqhg-V0lyaxbCErL0CD4c6YWQaw9EOycxleRQWyBsvt8gwIqOGi_on9Sf1bcYFHX62J73ST-kqKEwKdbZr8kOGXmofmWzG7GqvMd0wUxONlftE5deB78fv4O6cWEbgaKh3SngY_7DdR7rvQDMaGb0xpZtPoNIN-duxf89Xpe2HFzvSvLV1O3PasdFSGbfScIEaXmWUO6pS3hYbgqY5QqUIvUmSp69h-Ic7W22LCCMYfgHThcvm — 200 — 9.2 KiB — 139 ms — h2https://www.irs.gov/pub/css/css_KrI8Zfe1iQpJiHfe5RVnBQWjfoKTSk8rjfLDq-3inA0.css?delta=1&language=en&theme=pup_irs&include=eJx1kGtuxDAIhC9kx0eyiE0TtMRYYO82t282j7ZbbX_BfIwGAaQkmklKXLB0C_Cq44PyhM1Bzk2grOFqhg-V0lyaxbCErL0CD4c6YWQaw9EOycxleRQWyBsvt8gwIqOGi_on9Sf1bcYFHX62J73ST-kqKEwKdbZr8kOGXmofmWzG7GqvMd0wUxONlftE5deB78fv4O6cWEbgaKh3SngY_7DdR7rvQDMaGb0xpZtPoNIN-duxf89Xpe2HFzvSvLV1O3PasdFSGbfScIEaXmWUO6pS3hYbgqY5QqUIvUmSp69h-Ic7W22LCCMYfgHThcvmwww.irs.gov/pub/css/css_KrI8Zfe1iQp... https://www.irs.gov/pub/css/css_KrI8Zfe1iQpJiHfe5RVnBQWjfoKTSk8rjfLDq-3inA0.css?delta=1&language=en&theme=pup_irs&include=eJx1kGtuxDAIhC9kx0eyiE0TtMRYYO82t282j7ZbbX_BfIwGAaQkmklKXLB0C_Cq44PyhM1Bzk2grOFqhg-V0lyaxbCErL0CD4c6YWQaw9EOycxleRQWyBsvt8gwIqOGi_on9Sf1bcYFHX62J73ST-kqKEwKdbZr8kOGXmofmWzG7GqvMd0wUxONlftE5deB78fv4O6cWEbgaKh3SngY_7DdR7rvQDMaGb0xpZtPoNIN-duxf89Xpe2HFzvSvLV1O3PasdFSGbfScIEaXmWUO6pS3hYbgqY5QqUIvUmSp69h-Ic7W22LCCMYfgHThcvm — 200 — 51.2 KiB — 245 ms — h2https://www.irs.gov/pub/css/css_EbWGjClhsStXbsvwOq9iT6yGxHCg86ApUzr4bYwsoHk.css?delta=3&language=en&theme=pup_irs&include=eJx1kGtuxDAIhC9kx0eyiE0TtMRYYO82t282j7ZbbX_BfIwGAaQkmklKXLB0C_Cq44PyhM1Bzk2grOFqhg-V0lyaxbCErL0CD4c6YWQaw9EOycxleRQWyBsvt8gwIqOGi_on9Sf1bcYFHX62J73ST-kqKEwKdbZr8kOGXmofmWzG7GqvMd0wUxONlftE5deB78fv4O6cWEbgaKh3SngY_7DdR7rvQDMaGb0xpZtPoNIN-duxf89Xpe2HFzvSvLV1O3PasdFSGbfScIEaXmWUO6pS3hYbgqY5QqUIvUmSp69h-Ic7W22LCCMYfgHThcvmwww.irs.gov/pub/css/css_EbWGjClhsSt... 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h2https://region1.google-analytics.com/g/collect?v=2&tid=G-CSLL4ZEK4L&gtm=45je64f0v9131934939za200zb76811980zd76811980&_p=1776362068387&gcd=13l3lPl2l1l1&npa=1&dma_cps=a&dma=1&gdid=dMDhkMT&are=1&cid=1983583430.1776362069&frm=0&pscdl=noapi&rcb=8&sr=800x600&uaa=x86&uab=64&uafvl=Chromium%3B147.0.7727.55%7CNot.A%252FBrand%3B8.0.0.0&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=1&tag_exp=0~115616985~115938465~115938469~117266401&dl=https%3A%2F%2Firs.gov%2F&dt=Internal%20Revenue%20Service%20%7C%20An%20official%20website%20of%20the%20United%20States%20government&dr=&sid=1776362069&sct=1&seg=0&_tu=wA&en=page_view&_fv=1&_ss=1&_ee=1&ep.agency=IRS&ep.subagency=IRS.GOV&ep.site_topic=unspecified%3Airs.gov&ep.site_platform=unspecified%3Airs.gov&ep.script_source=https%3A%2F%2Fdap.digitalgov.gov%2Funiversal-federated-analytics-min.js&ep.version=20250702%20v8.7%20-%20ga4&ep.protocol=https%3A&ep.using_parallel_tracker=no&ep.hostname_dimension=irs.gov&tfd=2306region1.google-analytics.com/g/coll... https://region1.google-analytics.com/g/collect?v=2&tid=G-CSLL4ZEK4L&gtm=45je64f0v9131934939za200zb76811980zd76811980&_p=1776362068387&gcd=13l3lPl2l1l1&npa=1&dma_cps=a&dma=1&gdid=dMDhkMT&are=1&cid=1983583430.1776362069&frm=0&pscdl=noapi&rcb=8&sr=800x600&uaa=x86&uab=64&uafvl=Chromium%3B147.0.7727.55%7CNot.A%252FBrand%3B8.0.0.0&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=1&tag_exp=0~115616985~115938465~115938469~117266401&dl=https%3A%2F%2Firs.gov%2F&dt=Internal%20Revenue%20Service%20%7C%20An%20official%20website%20of%20the%20United%20States%20government&dr=&sid=1776362069&sct=1&seg=0&_tu=wA&en=page_view&_fv=1&_ss=1&_ee=1&ep.agency=IRS&ep.subagency=IRS.GOV&ep.site_topic=unspecified%3Airs.gov&ep.site_platform=unspecified%3Airs.gov&ep.script_source=https%3A%2F%2Fdap.digitalgov.gov%2Funiversal-federated-analytics-min.js&ep.version=20250702%20v8.7%20-%20ga4&ep.protocol=https%3A&ep.using_parallel_tracker=no&ep.hostname_dimension=irs.gov&tfd=2306 — 204 — 48 B — 27 ms — h2https://resources.digital-cloud-gov.medallia.com/wdcgov/20103/onsite/generic1776352584096.jsresources.digital-cloud-gov.medalli... https://resources.digital-cloud-gov.medallia.com/wdcgov/20103/onsite/generic1776352584096.js — 200 — 81.7 KiB — 7 ms — h2https://www.irs.gov/themes/custom/pup_base/favicon.icowww.irs.gov/themes/custom/pup_base/... https://www.irs.gov/themes/custom/pup_base/favicon.ico — 200 — 1.2 KiB — 112 ms — h2
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 569ms · 509KB · $8/mo
www.irs.gov
Other
Optional
Execution 184ms
Transfer 52 KB
Unused 42%
Monthly Cost $2/mo
Unattributable
Other
Optional
Execution 97ms
Transfer 0 KB
Monthly Cost $1/mo
www.irs.gov
Other
Optional
Execution 81ms
Transfer 18 KB
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 77ms
Transfer 153 KB
Unused 41%
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 73ms
Transfer 139 KB
Unused 41%
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 59ms
Transfer 147 KB
Unused 42%
Monthly Cost $1/mo

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

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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