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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
76
GRADE
C
FIX
5
REVIEW
3
PASS
7
INFO
2

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

Mobile Desktop
30
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
100
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.

3.53 s

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

9.31 s

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

652 ms

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

0.359

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

5.82 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.

13.02 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
17
7 PASS 3 REVIEW 5 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 (1.5 MiB of 1.5 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Execution Cost
Action
2408ms total JS execution
FIX
2408ms total JS execution
Warning::
https://www.irs.gov/pub/js/js_w8fM3HiCn-P-n7TMi9se...: 685ms CPU time
Warning::
Unattributable: 366ms CPU time
Warning::
https://www.irs.gov/: 304ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=G-ZY6F...: 266ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-KV9...: 249ms CPU time
Warning::
Third-party scripts: 2408ms (100% of total)

Main Thread Breakdown

Script Evaluation 49% Other 20% Style & Layout 15% Script Parsing & Compilation 10% Parse HTML & CSS 4%
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-nlkA685ms356ms13ms3rd
Unattributable366ms12ms0ms3rd
https://www.irs.gov/304ms6ms2ms3rd
https://www.googletagmanager.com/gtag/js?id=G-ZY6FM95CS5&cx=c&gtm=4e64f0&bs=ctrl266ms215ms50ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-KV978ZL249ms201ms40ms3rd
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L226ms192ms33ms3rd
https://resources.digital-cloud-gov.medallia.com/wdcgov/20103/onsite/generic1776352584096.js91ms51ms40ms3rd
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-nlkA82ms42ms28ms3rd
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L&cx=c&gtm=4e64f0&bs=ctrl71ms26ms45ms3rd
https://dap.digitalgov.gov/web-vitals/dist/web-vitals.attribution.iife.js67ms64ms2ms3rd
D
JS Bundles
Action
16 scripts, 446 KB unused
FIX
16 scripts, 446 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: 446 KB
446 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L&cx=c&gtm=4e64f0&bs=ctrl147 KB106 KB (72%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-ZY6FM95CS5&cx=c&gtm=4e64f0&bs=ctrl153 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
50 resources · 1.5 MB · 446 KB savings available
FIX
50 resources · 1.5 MB · 446 KB savings available
Warning::
Page weight 557 KB over 1MB target
Got: 1.5 MB Expected: ≤ 1 MB
Info::
~446 KB of savings available
Warning::
49 third-party resources (100% of weight)
50 resources · 1.5 MiB · 49 third-party 556.7 KiB over 1MB target
JavaScript 55% · 862.6 KiB
Image 20% · 321.4 KiB
Font 18% · 289.6 KiB
CSS 6% · 87.8 KiB
Document 1% · 18.6 KiB
Other 0% · 764 B

~445.7 KiB of savings available

Remove unused JavaScript: 445.7 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
Page Weight Budget
1.5 MB transferred, 50 requests
REVIEW
1.5 MB transferred, 50 requests
Info::
Page weighs 4.2 MB (1.5 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::
50 HTTP requests
Info::
Estimated 0.32 g CO2 per page load
1.5 MB / 2.4 MB budget
1.5 MB transferred
50 requests
0.32 g CO2 per page load
JavaScript 862.6 KiB 55%
Images 320.2 KiB 20%
Fonts 289.6 KiB 18%
CSS 87.8 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
21 images, 0 KB saveable
REVIEW
21 images, 0 KB saveable
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/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/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/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/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/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/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/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/pub/image/scamhomepage.jpg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
21 images 320 KB
0 oversized -0 KB
21 legacy format
9 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

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 4.0 s 5.0 s 6.0 s 7.0 s 8.0 s 9.0 s FCP 3.5 s LCP 9.3 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 — 315 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 — 352 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 — 375 ms — font-display: swap
sourcesans3-regular.woff2 woff2 swap
Size 107 KB
Load time 315 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 352 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 375 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
A+
Render-Blocking Resources
No render-blocking resources detected
PASS
No render-blocking resources detected
Info::
No render-blocking resources detected in <head>
A+
Third-Party Resources
No third-party resources detected
PASS
No third-party resources detected
Network Waterfall
50 requests over 2548ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s 8.0 s 9.0 s FCP 3.5 s LCP 9.3 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 — 408 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 — 9.1 KiB — 134 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 — 51.1 KiB — 239 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=1776362047905&gcd=13l3lPl2l1l1&npa=1&dma_cps=a&dma=1&gdid=dMDhkMT&are=1&cid=1066242123.1776362049&frm=0&pscdl=noapi&rcb=0&sr=412x823&uaa=&uab=64&uafvl=Chromium%3B147.0.7727.55%7CNot.A%252FBrand%3B8.0.0.0&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&_s=1&tag_exp=0~115938465~115938468~116363098~117266401&dl=https%3A%2F%2Firs.gov%2F&dt=Internal%20Revenue%20Service%20%7C%20An%20official%20website%20of%20the%20United%20States%20government&dr=&sid=1776362048&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=2377region1.google-analytics.com/g/coll... https://region1.google-analytics.com/g/collect?v=2&tid=G-CSLL4ZEK4L&gtm=45je64f0v9131934939za200zb76811980zd76811980&_p=1776362047905&gcd=13l3lPl2l1l1&npa=1&dma_cps=a&dma=1&gdid=dMDhkMT&are=1&cid=1066242123.1776362049&frm=0&pscdl=noapi&rcb=0&sr=412x823&uaa=&uab=64&uafvl=Chromium%3B147.0.7727.55%7CNot.A%252FBrand%3B8.0.0.0&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&_s=1&tag_exp=0~115938465~115938468~116363098~117266401&dl=https%3A%2F%2Firs.gov%2F&dt=Internal%20Revenue%20Service%20%7C%20An%20official%20website%20of%20the%20United%20States%20government&dr=&sid=1776362048&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=2377 — 204 — 48 B — 52 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 — 32 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 — 118 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 2408ms · 809KB · $32/mo
www.irs.gov
Other
Costly
Execution 685ms
Transfer 52 KB
Unused 42%
Monthly Cost $9/mo
Unattributable
Other
Costly
Execution 366ms
Transfer 0 KB
Monthly Cost $5/mo
www.irs.gov
Other
Costly
Execution 304ms
Transfer 18 KB
Monthly Cost $4/mo
Google Tag Manager
Tag Manager
Costly
Execution 266ms
Transfer 153 KB
Unused 41%
Monthly Cost $4/mo
Google Tag Manager
Tag Manager
Costly
Execution 249ms
Transfer 139 KB
Unused 41%
Monthly Cost $3/mo
Google Tag Manager
Tag Manager
Costly
Execution 226ms
Transfer 147 KB
Unused 42%
Monthly Cost $3/mo
resources.digital-cloud-gov.medallia.com
Other
Optional
Execution 91ms
Transfer 82 KB
Unused 57%
Monthly Cost $1/mo
www.irs.gov
Other
Optional
Execution 82ms
Transfer 67 KB
Unused 71%
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 71ms
Transfer 147 KB
Unused 72%
Monthly Cost $1/mo
dap.digitalgov.gov
Other
Optional
Execution 67ms
Transfer 4 KB
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • www.irs.gov adds 685ms and costs ~$9/month
  • Unattributable adds 366ms and costs ~$5/month
  • www.irs.gov adds 304ms and costs ~$4/month
  • Google Tag Manager adds 266ms and costs ~$4/month
  • Google Tag Manager adds 249ms and costs ~$3/month
  • Google Tag Manager adds 226ms 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.irs.gov takes 685ms 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 366ms 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.irs.gov takes 304ms 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 266ms 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 249ms 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 226ms 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

57% of resources.digital-cloud-gov.medallia.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

71% of www.irs.gov'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

72% of Google Tag Manager'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.

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