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https://authy.com

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
82
GRADE
B
FIX
3
REVIEW
4
PASS
8
INFO
2

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

Mobile Desktop
57
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
87
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.

5.84 s

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

9.41 s

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

196 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.

5.84 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.

9.42 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
8 PASS 4 REVIEW 3 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 (1.2 MiB of 1.2 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Execution Cost
Action
2534ms total JS execution
FIX
2534ms total JS execution
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-PLD...: 656ms CPU time
Warning::
https://www.authy.com/: 558ms CPU time
Warning::
Unattributable: 412ms CPU time
Warning::
https://consent.trustarc.com/asset/adv-bundle.js?v...: 297ms CPU time
Info::
https://assets.adobedtm.com/a62564f453ce/b1b9d7ec9...: 236ms CPU time
Warning::
Third-party scripts: 2534ms (100% of total)

Main Thread Breakdown

Script Evaluation 49% Other 25% Style & Layout 14% Script Parsing & Compilation 6%
ScriptTotalScriptingParse/CompileParty
https://www.googletagmanager.com/gtm.js?id=GTM-PLD44Z656ms451ms52ms3rd
https://www.authy.com/558ms142ms11ms3rd
Unattributable412ms4ms0ms3rd
https://consent.trustarc.com/asset/adv-bundle.js?v=v1.7-1729297ms195ms2ms3rd
https://assets.adobedtm.com/a62564f453ce/b1b9d7ec982b/launch-29605e749a31.min.js236ms167ms26ms3rd
https://www.authy.com/etc.clientlibs/twilio-foundation/clientlibs/clientlib-dynamic-modules/resources/5874.c1d494a1c6eb384691be.js142ms101ms21ms3rd
https://consent.trustarc.com/asset/notice.js/v/v1.7-1729102ms76ms9ms3rd
https://www.authy.com/etc.clientlibs/twilio-foundation/clientlibs/clientlib-site.lc-3db62ef53f54b416f58022e27f60f2cf-lc.min.js67ms55ms12ms3rd
https://www.authy.com/etc.clientlibs/clientlibs/granite/jquery.lc-7842899024219bcbdb5e72c946870b79-lc.min.js65ms37ms9ms3rd
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
1.2 MB transferred, 52 requests
REVIEW
1.2 MB transferred, 52 requests
Info::
Page weighs 3.1 MB (1.2 MB transferred)
Warning::
JavaScript is 556 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 556 KB
Info::
Fonts are 339 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 339 KB
Info::
52 HTTP requests
Info::
Estimated 0.24 g CO2 per page load
1.2 MB / 2.4 MB budget
1.2 MB transferred
52 requests
0.24 g CO2 per page load
JavaScript 555.9 KiB 47%
Fonts 339.2 KiB 29%
Images 119.5 KiB 10%
CSS 96.1 KiB 8%
Other 37.8 KiB 3%
HTML 32.0 KiB 3%
Other 3.6 KiB 0%
Other 2.6 KiB 0%
Other 1.1 KiB 0%
0 2.4 MB 4.9 MB
Under 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

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

B
Image Optimization
8 images, 0 KB saveable
REVIEW
8 images, 0 KB saveable
Warning::
https://consent.trustarc.com/asset/twilio2.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
8 images 120 KB
0 oversized -0 KB
6 legacy format
1 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

C
JS Bundles
Action
23 scripts, 247 KB unused
REVIEW
23 scripts, 247 KB unused
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-PLD...: 83 KB unused (54%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.authy.com/etc.clientlibs/twilio-founda...: 47 KB unused (77%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://assets.adobedtm.com/a62564f453ce/b1b9d7ec9...: 42 KB unused (56%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.authy.com/etc.clientlibs/twilio-com/cl...: 27 KB unused (71%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.authy.com/etc.clientlibs/twilio-founda...: 25 KB unused (65%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 247 KB
247 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtm.js?id=GTM-PLD44Z155 KB83 KB (54%)✓3rd
https://www.authy.com/etc.clientlibs/twilio-foundation/clientlibs/clientlib-dynamic-modules/resources/5874.c1d494a1c6eb384691be.js62 KB47 KB (77%)✓3rd
https://assets.adobedtm.com/a62564f453ce/b1b9d7ec982b/launch-29605e749a31.min.js76 KB42 KB (56%)✓3rd
https://www.authy.com/etc.clientlibs/twilio-com/clientlibs/clientlib-site.lc-4750d7d000b27b3f16919e93029e86fe-lc.min.js39 KB27 KB (71%)✓3rd
https://www.authy.com/etc.clientlibs/twilio-foundation/clientlibs/clientlib-site.lc-3db62ef53f54b416f58022e27f60f2cf-lc.min.js39 KB25 KB (65%)✓3rd
https://www.authy.com/etc.clientlibs/clientlibs/granite/jquery.lc-7842899024219bcbdb5e72c946870b79-lc.min.js36 KB23 KB (65%)✓3rd
https://www.authy.com/etc.clientlibs/twilio-foundation/clientlibs/clientlib-dynamic-modules/resources/3755.c80faef32e8351b5f378.js3 KB—✓3rd
https://www.authy.com/etc.clientlibs/twilio-foundation/clientlibs/clientlib-dynamic-modules/resources/1613.ac907925dbbb05a56518.js2 KB—✓3rd
https://dev.visualwebsiteoptimizer.com/j.php?a=1176295&u=https%3A%2F%2Fwww.authy.com%2F&vn=2.2&ph=1&st=160.5999994277954&x=true2 KB—✓3rd
https://www.authy.com/etc.clientlibs/twilio-com/clientlibs/clientlib-dependencies.lc-d41d8cd98f00b204e9800998ecf8427e-lc.min.js1 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

B
Page Weight Inventory
52 resources · 1.2 MB · 247 KB savings available
REVIEW
52 resources · 1.2 MB · 247 KB savings available
Warning::
Page weight 164 KB over 1MB target
Got: 1.2 MB Expected: ≤ 1 MB
Info::
~247 KB of savings available
Warning::
51 third-party resources (100% of weight)
52 resources · 1.2 MiB · 51 third-party 163.7 KiB over 1MB target
JavaScript 50% · 594.5 KiB
Font 29% · 339.2 KiB
Image 10% · 122.6 KiB
CSS 8% · 96.1 KiB
Document 3% · 32.0 KiB
Other 0% · 3.5 KiB

~247.1 KiB of savings available

Remove unused JavaScript: 247.1 KiB
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
7 fonts (339 KB)
PASS
7 fonts (339 KB)
Info::
7 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

7

339 KB total

Render-blocking

0

of 7

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 5.8 s LCP 9.4 shttps://www.authy.com/etc.clientlibs/twilio-foundation/clientlibs/clientlib-site/resources/e408c138892b0f08a23d.woff2e408c138892b0f08a23d.woff2 https://www.authy.com/etc.clientlibs/twilio-foundation/clientlibs/clientlib-site/resources/e408c138892b0f08a23d.woff2 — 72.6 KiB — 29 ms — font-display: swaphttps://www.authy.com/etc.clientlibs/twilio-foundation/clientlibs/clientlib-site/resources/ee7a891efcbc6ef61942.woff2ee7a891efcbc6ef61942.woff2 https://www.authy.com/etc.clientlibs/twilio-foundation/clientlibs/clientlib-site/resources/ee7a891efcbc6ef61942.woff2 — 73.9 KiB — 30 ms — font-display: swaphttps://www.authy.com/etc.clientlibs/twilio-foundation/clientlibs/clientlib-site/resources/a20a647d19af27011c7c.woff2a20a647d19af27011c7c.woff2 https://www.authy.com/etc.clientlibs/twilio-foundation/clientlibs/clientlib-site/resources/a20a647d19af27011c7c.woff2 — 72.7 KiB — 31 ms — font-display: swaphttps://www.authy.com/etc.clientlibs/twilio-foundation/clientlibs/clientlib-site/resources/220e5b59f8588716f4d8.woff2220e5b59f8588716f4d8.woff2 https://www.authy.com/etc.clientlibs/twilio-foundation/clientlibs/clientlib-site/resources/220e5b59f8588716f4d8.woff2 — 74.0 KiB — 32 ms — font-display: swaphttps://consent.trustarc.com/get?name=Whitney-Light.otfget https://consent.trustarc.com/get?name=Whitney-Light.otf — 15.3 KiB — 4 ms — font-display: swaphttps://consent.trustarc.com/get?name=Whitney-Book.otfget https://consent.trustarc.com/get?name=Whitney-Book.otf — 15.5 KiB — 5 ms — font-display: swaphttps://consent.trustarc.com/get?name=Whitney-Medium.otfget https://consent.trustarc.com/get?name=Whitney-Medium.otf — 15.1 KiB — 4 ms — font-display: swap
e408c138892b0f08a23d.woff2 woff2 swap
Size 73 KB
Load time 29 ms
Start 249 ms
Risk FOUT — text flashes from fallback to web font
ee7a891efcbc6ef61942.woff2 woff2 swap
Size 74 KB
Load time 30 ms
Start 249 ms
Risk FOUT — text flashes from fallback to web font
a20a647d19af27011c7c.woff2 woff2 swap
Size 73 KB
Load time 31 ms
Start 250 ms
Risk FOUT — text flashes from fallback to web font
220e5b59f8588716f4d8.woff2 woff2 swap
Size 74 KB
Load time 32 ms
Start 250 ms
Risk FOUT — text flashes from fallback to web font
get otf swap
Size 15 KB
Load time 4 ms
Start 662 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
get otf swap
Size 15 KB
Load time 5 ms
Start 663 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
get otf swap
Size 15 KB
Load time 4 ms
Start 679 ms
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 ~14 KB and ~28 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
1 hints, 0 missing preconnects
PASS
1 hints, 0 missing preconnects
Info::
Page uses 1 resource hint(s)

Current Resource Hints

preconnect
1
preload
—
dns-prefetch
—
prefetch
—

1 resource hints configured

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
A+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Cloudflare

Network Waterfall
52 requests over 1768ms
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 5.8 s LCP 9.4 shttps://authy.com// https://authy.com/ — 301 — 475 B — 101 ms — http/1.1https://www.authy.com/www.authy.com/ https://www.authy.com/ — 200 — 28.8 KiB — 19 ms — h2https://rum.hlx.page/.rum/@adobe/helix-rum-js@%5E2/dist/micro.jsrum.hlx.page/.rum/@adobe/helix-rum-... https://rum.hlx.page/.rum/@adobe/helix-rum-js@%5E2/dist/micro.js — 200 — 1.0 KiB — 55 ms — h2https://consent.trustarc.com/notice?domain=authy.com&c=teconsent&gtm=1&js=nj&noticeType=bbconsent.trustarc.com/notice?domain=... https://consent.trustarc.com/notice?domain=authy.com&c=teconsent&gtm=1&js=nj&noticeType=bb — 200 — 6.3 KiB — 87 ms — h2https://www.authy.com/etc.clientlibs/twilio-foundation/clientlibs/clientlib-dependencies.lc-d41d8cd98f00b204e9800998ecf8427e-lc.min.csswww.authy.com/etc.clientlibs/twilio... https://www.authy.com/etc.clientlibs/twilio-foundation/clientlibs/clientlib-dependencies.lc-d41d8cd98f00b204e9800998ecf8427e-lc.min.css — 200 — 558 B — 23 ms — h2https://www.authy.com/etc.clientlibs/twilio-foundation/clientlibs/clientlib-site.lc-a6f2c4a542fd58e3bc540c4adbde463b-lc.min.csswww.authy.com/etc.clientlibs/twilio... https://www.authy.com/etc.clientlibs/twilio-foundation/clientlibs/clientlib-site.lc-a6f2c4a542fd58e3bc540c4adbde463b-lc.min.css — 200 — 51.8 KiB — 33 ms — h2https://www.authy.com/etc.clientlibs/twilio-com/clientlibs/clientlib-dependencies.lc-d41d8cd98f00b204e9800998ecf8427e-lc.min.csswww.authy.com/etc.clientlibs/twilio... https://www.authy.com/etc.clientlibs/twilio-com/clientlibs/clientlib-dependencies.lc-d41d8cd98f00b204e9800998ecf8427e-lc.min.css — 200 — 558 B — 21 ms — h2https://www.authy.com/etc.clientlibs/twilio-com/clientlibs/clientlib-site.lc-613e6f743c6e4c8119fdc42a4f2e75f1-lc.min.csswww.authy.com/etc.clientlibs/twilio... https://www.authy.com/etc.clientlibs/twilio-com/clientlibs/clientlib-site.lc-613e6f743c6e4c8119fdc42a4f2e75f1-lc.min.css — 200 — 43.2 KiB — 38 ms — h2https://www.authy.com/etc.clientlibs/twilio-foundation/clientlibs/clientlib-dependencies.lc-d41d8cd98f00b204e9800998ecf8427e-lc.min.jswww.authy.com/etc.clientlibs/twilio... https://www.authy.com/etc.clientlibs/twilio-foundation/clientlibs/clientlib-dependencies.lc-d41d8cd98f00b204e9800998ecf8427e-lc.min.js — 200 — 569 B — 28 ms — h2https://www.authy.com/etc.clientlibs/clientlibs/granite/jquery.lc-7842899024219bcbdb5e72c946870b79-lc.min.jswww.authy.com/etc.clientlibs/client... https://www.authy.com/etc.clientlibs/clientlibs/granite/jquery.lc-7842899024219bcbdb5e72c946870b79-lc.min.js — 200 — 35.6 KiB — 31 ms — h2https://www.authy.com/etc.clientlibs/clientlibs/granite/utils.lc-e7bf340a353e643d198b25d0c8ccce47-lc.min.jswww.authy.com/etc.clientlibs/client... https://www.authy.com/etc.clientlibs/clientlibs/granite/utils.lc-e7bf340a353e643d198b25d0c8ccce47-lc.min.js — 200 — 4.0 KiB — 29 ms — h2https://www.authy.com/etc.clientlibs/twilio-foundation/clientlibs/clientlib-site.lc-3db62ef53f54b416f58022e27f60f2cf-lc.min.jswww.authy.com/etc.clientlibs/twilio... https://www.authy.com/etc.clientlibs/twilio-foundation/clientlibs/clientlib-site.lc-3db62ef53f54b416f58022e27f60f2cf-lc.min.js — 200 — 38.5 KiB — 24 ms — h2https://www.authy.com/etc.clientlibs/twilio-com/clientlibs/clientlib-dependencies.lc-d41d8cd98f00b204e9800998ecf8427e-lc.min.jswww.authy.com/etc.clientlibs/twilio... https://www.authy.com/etc.clientlibs/twilio-com/clientlibs/clientlib-dependencies.lc-d41d8cd98f00b204e9800998ecf8427e-lc.min.js — 200 — 567 B — 16 ms — h2https://www.authy.com/etc.clientlibs/twilio-com/clientlibs/clientlib-site.lc-4750d7d000b27b3f16919e93029e86fe-lc.min.jswww.authy.com/etc.clientlibs/twilio... https://www.authy.com/etc.clientlibs/twilio-com/clientlibs/clientlib-site.lc-4750d7d000b27b3f16919e93029e86fe-lc.min.js — 200 — 39.0 KiB — 36 ms — h2https://dev.visualwebsiteoptimizer.com/j.php?a=1176295&u=https%3A%2F%2Fwww.authy.com%2F&vn=2.2&ph=1&st=160.5999994277954&x=truedev.visualwebsiteoptimizer.com/j.ph... https://dev.visualwebsiteoptimizer.com/j.php?a=1176295&u=https%3A%2F%2Fwww.authy.com%2F&vn=2.2&ph=1&st=160.5999994277954&x=true — 200 — 1.7 KiB — 85 ms — h2https://www.authy.com/content/dam/twilio-com/core-assets/social/site.webmanifestwww.authy.com/content/dam/twilio-co... https://www.authy.com/content/dam/twilio-com/core-assets/social/site.webmanifest — 200 — 1.1 KiB — 18 ms — h2https://assets.adobedtm.com/a62564f453ce/b1b9d7ec982b/launch-29605e749a31.min.jsassets.adobedtm.com/a62564f453ce/b1... https://assets.adobedtm.com/a62564f453ce/b1b9d7ec982b/launch-29605e749a31.min.js — 200 — 75.5 KiB — 49 ms — h2https://www.googletagmanager.com/gtm.js?id=GTM-PLD44Zwww.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-PLD44Z — 200 — 154.6 KiB — 178 ms — h2https://www.authy.com/content/dam/authy/global/en/legacy/hero-home.jpg/_jcr_content/renditions/compressed-original.webpwww.authy.com/content/dam/authy/glo... https://www.authy.com/content/dam/authy/global/en/legacy/hero-home.jpg/_jcr_content/renditions/compressed-original.webp — 200 — 31.7 KiB — 6 ms — h2https://www.authy.com/content/dam/authy/global/en/legacy/maxresdefault.png/_jcr_content/renditions/compressed-original.webpwww.authy.com/content/dam/authy/glo... https://www.authy.com/content/dam/authy/global/en/legacy/maxresdefault.png/_jcr_content/renditions/compressed-original.webp — 200 — 58.2 KiB — 32 ms — h2https://www.authy.com/etc.clientlibs/twilio-foundation/clientlibs/clientlib-site/resources/e408c138892b0f08a23d.woff2www.authy.com/etc.clientlibs/twilio... https://www.authy.com/etc.clientlibs/twilio-foundation/clientlibs/clientlib-site/resources/e408c138892b0f08a23d.woff2 — 200 — 72.6 KiB — 29 ms — h2https://www.authy.com/etc.clientlibs/twilio-foundation/clientlibs/clientlib-site/resources/ee7a891efcbc6ef61942.woff2www.authy.com/etc.clientlibs/twilio... https://www.authy.com/etc.clientlibs/twilio-foundation/clientlibs/clientlib-site/resources/ee7a891efcbc6ef61942.woff2 — 200 — 73.9 KiB — 30 ms — h2https://www.authy.com/etc.clientlibs/twilio-foundation/clientlibs/clientlib-site/resources/a20a647d19af27011c7c.woff2www.authy.com/etc.clientlibs/twilio... https://www.authy.com/etc.clientlibs/twilio-foundation/clientlibs/clientlib-site/resources/a20a647d19af27011c7c.woff2 — 200 — 72.7 KiB — 31 ms — h2https://www.authy.com/etc.clientlibs/twilio-foundation/clientlibs/clientlib-site/resources/220e5b59f8588716f4d8.woff2www.authy.com/etc.clientlibs/twilio... https://www.authy.com/etc.clientlibs/twilio-foundation/clientlibs/clientlib-site/resources/220e5b59f8588716f4d8.woff2 — 200 — 74.0 KiB — 32 ms — h2https://www.authy.com/etc.clientlibs/twilio-foundation/clientlibs/clientlib-dynamic-modules/resources/5874.c1d494a1c6eb384691be.jswww.authy.com/etc.clientlibs/twilio... https://www.authy.com/etc.clientlibs/twilio-foundation/clientlibs/clientlib-dynamic-modules/resources/5874.c1d494a1c6eb384691be.js — 200 — 61.6 KiB — 40 ms — h2https://www.authy.com/etc.clientlibs/twilio-foundation/clientlibs/clientlib-dynamic-modules/resources/2506.a86dc1892da07a9c4323.jswww.authy.com/etc.clientlibs/twilio... https://www.authy.com/etc.clientlibs/twilio-foundation/clientlibs/clientlib-dynamic-modules/resources/2506.a86dc1892da07a9c4323.js — 200 — 2.2 KiB — 35 ms — h2https://www.authy.com/etc.clientlibs/twilio-foundation/clientlibs/clientlib-dynamic-modules/resources/3755.c80faef32e8351b5f378.jswww.authy.com/etc.clientlibs/twilio... https://www.authy.com/etc.clientlibs/twilio-foundation/clientlibs/clientlib-dynamic-modules/resources/3755.c80faef32e8351b5f378.js — 200 — 2.6 KiB — 35 ms — 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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 5.8 s LCP 9.4 shttps://authy.com// https://authy.com/ — 301 — 475 B — 101 ms — http/1.1https://www.authy.com/www.authy.com/ https://www.authy.com/ — 200 — 28.8 KiB — 19 ms — h2https://rum.hlx.page/.rum/@adobe/helix-rum-js@%5E2/dist/micro.jsrum.hlx.page/.rum/@adobe/helix-rum-... https://rum.hlx.page/.rum/@adobe/helix-rum-js@%5E2/dist/micro.js — 200 — 1.0 KiB — 55 ms — h2https://consent.trustarc.com/notice?domain=authy.com&c=teconsent&gtm=1&js=nj&noticeType=bbconsent.trustarc.com/notice?domain=... https://consent.trustarc.com/notice?domain=authy.com&c=teconsent&gtm=1&js=nj&noticeType=bb — 200 — 6.3 KiB — 87 ms — h2https://www.authy.com/etc.clientlibs/twilio-foundation/clientlibs/clientlib-dependencies.lc-d41d8cd98f00b204e9800998ecf8427e-lc.min.csswww.authy.com/etc.clientlibs/twilio... https://www.authy.com/etc.clientlibs/twilio-foundation/clientlibs/clientlib-dependencies.lc-d41d8cd98f00b204e9800998ecf8427e-lc.min.css — 200 — 558 B — 23 ms — h2https://www.authy.com/etc.clientlibs/twilio-foundation/clientlibs/clientlib-site.lc-a6f2c4a542fd58e3bc540c4adbde463b-lc.min.csswww.authy.com/etc.clientlibs/twilio... https://www.authy.com/etc.clientlibs/twilio-foundation/clientlibs/clientlib-site.lc-a6f2c4a542fd58e3bc540c4adbde463b-lc.min.css — 200 — 51.8 KiB — 33 ms — h2https://www.authy.com/etc.clientlibs/twilio-com/clientlibs/clientlib-dependencies.lc-d41d8cd98f00b204e9800998ecf8427e-lc.min.csswww.authy.com/etc.clientlibs/twilio... https://www.authy.com/etc.clientlibs/twilio-com/clientlibs/clientlib-dependencies.lc-d41d8cd98f00b204e9800998ecf8427e-lc.min.css — 200 — 558 B — 21 ms — h2https://www.authy.com/etc.clientlibs/twilio-com/clientlibs/clientlib-site.lc-613e6f743c6e4c8119fdc42a4f2e75f1-lc.min.csswww.authy.com/etc.clientlibs/twilio... https://www.authy.com/etc.clientlibs/twilio-com/clientlibs/clientlib-site.lc-613e6f743c6e4c8119fdc42a4f2e75f1-lc.min.css — 200 — 43.2 KiB — 38 ms — 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h2https://www.authy.com/etc.clientlibs/twilio-foundation/clientlibs/clientlib-dynamic-modules/resources/9869.4df035ae9e86852e93f8.jswww.authy.com/etc.clientlibs/twilio... https://www.authy.com/etc.clientlibs/twilio-foundation/clientlibs/clientlib-dynamic-modules/resources/9869.4df035ae9e86852e93f8.js — 200 — 786 B — 34 ms — h2https://www.authy.com/etc.clientlibs/twilio-foundation/clientlibs/clientlib-dynamic-modules/resources/1613.ac907925dbbb05a56518.jswww.authy.com/etc.clientlibs/twilio... https://www.authy.com/etc.clientlibs/twilio-foundation/clientlibs/clientlib-dynamic-modules/resources/1613.ac907925dbbb05a56518.js — 200 — 1.5 KiB — 14 ms — h2https://www.authy.com/etc.clientlibs/twilio-foundation/clientlibs/clientlib-dynamic-modules/resources/4064.1be6bdd3b2f427b304f0.jswww.authy.com/etc.clientlibs/twilio... https://www.authy.com/etc.clientlibs/twilio-foundation/clientlibs/clientlib-dynamic-modules/resources/4064.1be6bdd3b2f427b304f0.js — 200 — 11.9 KiB — 37 ms — 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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 2534ms · 509KB · €41/mo
Google Tag Manager
Tag Manager
Costly
Execution 656ms
Transfer 155 KB
Unused 54%
Monthly Cost €10/mo
www.authy.com
Other
Costly
Execution 558ms
Transfer 29 KB
Monthly Cost €9/mo
Unattributable
Other
Costly
Execution 412ms
Transfer 0 KB
Monthly Cost €7/mo
consent.trustarc.com
Other
Costly
Execution 297ms
Transfer 78 KB
Monthly Cost €5/mo
assets.adobedtm.com
Other
Costly
Execution 236ms
Transfer 76 KB
Unused 56%
Monthly Cost €4/mo
www.authy.com
Other
Optional
Execution 142ms
Transfer 62 KB
Unused 77%
Monthly Cost €2/mo
consent.trustarc.com
Other
Optional
Execution 102ms
Transfer 36 KB
Monthly Cost €2/mo
www.authy.com
Other
Optional
Execution 67ms
Transfer 39 KB
Unused 65%
Monthly Cost €1/mo
www.authy.com
Other
Optional
Execution 65ms
Transfer 36 KB
Unused 65%
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • Google Tag Manager adds 656ms and costs ~€10/month
  • www.authy.com adds 558ms and costs ~€9/month
  • Unattributable adds 412ms and costs ~€7/month
  • consent.trustarc.com adds 297ms and costs ~€5/month
  • assets.adobedtm.com adds 236ms and costs ~€4/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

Google Tag Manager takes 656ms 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 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

www.authy.com takes 558ms 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 412ms 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

consent.trustarc.com takes 297ms 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

assets.adobedtm.com takes 236ms 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

56% of assets.adobedtm.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.authy.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

65% of www.authy.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

65% of www.authy.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.

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