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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
72
GRADE
C
FIX
3
REVIEW
4
PASS
6
INFO
2

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

Mobile Desktop
60
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
97
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
77
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.

2.69 s

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

3.53 s

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

161 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.

3.30 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.

5.40 s

Page Load Progression

536 ms
1.1 s
1.6 s
2.1 s
2.7 s
3.2 s
3.8 s
4.3 s
Checks
15
6 PASS 4 REVIEW 3 FIX
F
Page Weight Budget
Action
3.7 MB transferred, 72 requests
FIX
3.7 MB transferred, 72 requests
Warning::
Page weighs 7.2 MB (3.7 MB transferred)
Warning::
JavaScript is 1.4 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.4 MB
Warning::
Images are 1.1 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.1 MB
Info::
Fonts are 882 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 882 KB
Info::
72 HTTP requests
Info::
Estimated 0.78 g CO2 per page load
3.7 MB / 2.4 MB budget
3.7 MB transferred
72 requests
0.78 g CO2 per page load
JavaScript 1.4 MiB 38%
Images 1.1 MiB 30%
Fonts 881.6 KiB 23%
Other 197.2 KiB 5%
CSS 114.0 KiB 3%
HTML 43.4 KiB 1%
Other 7.5 KiB 0%
Other 4.1 KiB 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Over budget

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

Why this matters

JavaScript bundle is large — code-split routes and lazy-load off-screen components to defer.

Source: web.dev

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

Why this matters

Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.

Source: web.dev

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

Why this matters

Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).

Source: web.dev font loading

F
JS Bundles
Action
21 scripts, 694 KB unused
FIX
21 scripts, 694 KB unused
Warning::
https://asm.org/content/dist/vendor.min.js?v=5682b...: 302 KB unused (83%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-864F...: 118 KB unused (71%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-MZTP...: 68 KB unused (40%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=AW-855...: 64 KB unused (43%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=AW-858...: 62 KB unused (37%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 694 KB
694 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://asm.org/content/dist/vendor.min.js?v=5682bf5710d3865078d0ab8eba45612074be8ac27f3fe7a281ee9de3f2caff90368 KB302 KB (83%)✓1st
https://www.googletagmanager.com/gtag/js?id=G-864FXWB263&cx=c&gtm=4e64h1167 KB118 KB (71%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-MZTPXVJ8R2&cx=c&gtm=4e64h1173 KB68 KB (40%)✓3rd
https://www.googletagmanager.com/gtag/js?id=AW-855308285&cx=c&gtm=4e64h1148 KB64 KB (43%)✓3rd
https://www.googletagmanager.com/gtag/js?id=AW-858234627&cx=c&gtm=4e64h1167 KB62 KB (37%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-5BH7J8M173 KB57 KB (33%)✓3rd
https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js30 KB22 KB (75%)✓3rd
https://asm.org/content/dist/responsive-table.min.js?v=6ff7f0e95c8833ff9ce0dd037bf278383341f34cbc195139ac368cbd694598bc7 KB—✓1st
https://api.ipify.org/?format=jsonp&callback=getIP0 KB—✓3rd
https://asm.org/content/dist/plugins/liga.js?v=39461eda97362282ef523252fe992bb53de197a0dd7e8fd1f726fa0164165a1015 KB—✓1st

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

D
Page Weight Inventory
Action
72 resources · 3.7 MB · 694 KB savings available
FIX
72 resources · 3.7 MB · 694 KB savings available
Warning::
Page weight 2.7 MB over 1MB target
Got: 3.7 MB Expected: ≤ 1 MB
Info::
~694 KB of savings available
Info::
34 third-party resources (32% of weight)
Info::
5 resources over 200KB
72 resources · 3.7 MiB · 34 third-party 2.7 MiB over 1MB target
JavaScript 38% · 1.4 MiB
Image 34% · 1.3 MiB
Font 23% · 881.6 KiB
CSS 3% · 114.0 KiB
Document 2% · 81.2 KiB
Other 0% · 4.7 KiB

~694.4 KiB of savings available

Remove unused JavaScript: 694.4 KiB
B
Image Optimization
11 images, 0 KB saveable
REVIEW
11 images, 0 KB saveable
Warning::
https://asm.org/content/images/logo-footer.svg?v=e... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
11 images 1.1 MB
0 oversized -0 KB
10 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 Execution Cost
Action
1236ms total JS execution
REVIEW
1236ms total JS execution
Warning::
https://asm.org/: 258ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-5BH...: 207ms CPU time
Info::
Unattributable: 172ms CPU time
Info::
https://cmp.osano.com/16CXxzUMyG0rk3ynA/80d48381-f...: 156ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-MZTP...: 155ms CPU time
Warning::
Third-party scripts: 834ms (67% of total)

Main Thread Breakdown

Script Evaluation 54% Other 15% Script Parsing & Compilation 13% Style & Layout 12%
ScriptTotalScriptingParse/CompileParty
https://asm.org/258ms10ms2ms1st
https://www.googletagmanager.com/gtm.js?id=GTM-5BH7J8M207ms174ms22ms3rd
Unattributable172ms9ms0ms3rd
https://cmp.osano.com/16CXxzUMyG0rk3ynA/80d48381-f550-4573-96db-e6de4a4cd97b/osano.js156ms133ms9ms3rd
https://www.googletagmanager.com/gtag/js?id=G-MZTPXVJ8R2&cx=c&gtm=4e64h1155ms136ms18ms3rd
https://www.googletagmanager.com/gtag/js?id=AW-858234627&cx=c&gtm=4e64h188ms66ms21ms3rd
https://asm.org/content/dist/vendor.min.js?v=5682bf5710d3865078d0ab8eba45612074be8ac27f3fe7a281ee9de3f2caff9083ms32ms50ms1st
https://asm.org/content/dist/master.min.js?v=8123ff3ce51ed2fe7cda9373615ca1edbd87c040aee167baebcff8cfd514caef62ms58ms2ms1st
https://www.googletagmanager.com/gtag/js?id=AW-855308285&cx=c&gtm=4e64h156ms41ms14ms3rd
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

B
HTTP Caching
private
REVIEW
private
Info::
Cache-Control header is set
Got: private
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

private

DirectiveValueMeaning
private—Only browser cache, not CDN/proxy
A
Third-Party Impact
32% third-party, 0 ms blocking
PASS
32% third-party, 0 ms blocking
Info::
Third-party code accounts for 32% of page weight (1.2 MiB of 3.7 MiB)
Info::
Third-party blocking time is low (0 ms)
68%
32%
First-party Third-party
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
10 fonts (882 KB)
PASS
10 fonts (882 KB)
Info::
10 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

10

882 KB total

Render-blocking

0

of 10

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 2.7 s LCP 3.5 shttps://asm.org/content/dist/assets/lineto-replica-pro-light.woff2lineto-replica-pro-ligh... https://asm.org/content/dist/assets/lineto-replica-pro-light.woff2 — 46.3 KiB — 390 ms — font-display: swaphttps://asm.org/content/dist/assets/lineto-replica-pro-bold.woff2lineto-replica-pro-bold... https://asm.org/content/dist/assets/lineto-replica-pro-bold.woff2 — 47.0 KiB — 385 ms — font-display: swaphttps://asm.org/content/dist/assets/fb493903265cad425ccdf8e04fc2de61.woff2fb493903265cad425ccdf8e... https://asm.org/content/dist/assets/fb493903265cad425ccdf8e04fc2de61.woff2 — 75.3 KiB — 401 ms — font-display: swaphttps://fonts.gstatic.com/s/sourceserifpro/v18/neIXzD-0qpwxpaWvjeD0X88SAOeasasatSyqxKcsdrM.woff2neIXzD-0qpwxpaWvjeD0X88... https://fonts.gstatic.com/s/sourceserifpro/v18/neIXzD-0qpwxpaWvjeD0X88SAOeasasatSyqxKcsdrM.woff2 — 21.1 KiB — 11 ms — font-display: swaphttps://asm.org/content/dist/assets/lineto-replica-pro-italic.woff2lineto-replica-pro-ital... https://asm.org/content/dist/assets/lineto-replica-pro-italic.woff2 — 47.6 KiB — 404 ms — font-display: swaphttps://fonts.gstatic.com/s/sourceserifpro/v18/neIQzD-0qpwxpaWvjeD0X88SAOeauXQ-oAGIyY0.woff2neIQzD-0qpwxpaWvjeD0X88... https://fonts.gstatic.com/s/sourceserifpro/v18/neIQzD-0qpwxpaWvjeD0X88SAOeauXQ-oAGIyY0.woff2 — 20.0 KiB — 9 ms — font-display: swaphttps://asm.org/content/dist/assets/lineto-replica-pro-regular.woff2lineto-replica-pro-regu... https://asm.org/content/dist/assets/lineto-replica-pro-regular.woff2 — 46.7 KiB — 395 ms — font-display: swaphttps://use.fontawesome.com/releases/v6.4.2/webfonts/fa-brands-400.woff2fa-brands-400.woff2 https://use.fontawesome.com/releases/v6.4.2/webfonts/fa-brands-400.woff2 — 107.7 KiB — 18 ms — font-display: swaphttps://asm.org/content/dist/assets/lineto-replica-pro-bolditalic.woff2lineto-replica-pro-bold... https://asm.org/content/dist/assets/lineto-replica-pro-bolditalic.woff2 — 48.8 KiB — 398 ms — font-display: swaphttps://asm.org/content/dist/assets/linearicons.ttflinearicons.ttf https://asm.org/content/dist/assets/linearicons.ttf — 421.2 KiB — 470 ms — font-display: swap
lineto-replica-pro-ligh... woff2 swap
Size 46 KB
Load time 390 ms
Start 2.1 s
Risk FOUT — text flashes from fallback to web font
lineto-replica-pro-bold... woff2 swap
Size 47 KB
Load time 385 ms
Start 2.1 s
Risk FOUT — text flashes from fallback to web font
fb493903265cad425ccdf8e... woff2 swap
Size 75 KB
Load time 401 ms
Start 2.1 s
Risk FOUT — text flashes from fallback to web font
neIXzD-0qpwxpaWvjeD0X88... woff2 swap
Size 21 KB
Load time 11 ms
Start 2.1 s
Risk FOUT — text flashes from fallback to web font
lineto-replica-pro-ital... woff2 swap
Size 48 KB
Load time 404 ms
Start 2.1 s
Risk FOUT — text flashes from fallback to web font
neIQzD-0qpwxpaWvjeD0X88... woff2 swap
Size 20 KB
Load time 9 ms
Start 2.1 s
Risk FOUT — text flashes from fallback to web font
lineto-replica-pro-regu... woff2 swap
Size 47 KB
Load time 395 ms
Start 2.1 s
Risk FOUT — text flashes from fallback to web font
fa-brands-400.woff2 woff2 swap
Size 108 KB
Load time 18 ms
Start 2.1 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
lineto-replica-pro-bold... woff2 swap
Size 49 KB
Load time 398 ms
Start 2.1 s
Risk FOUT — text flashes from fallback to web font
linearicons.ttf ttf swap
Size 421 KB
Load time 470 ms
Start 2.6 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
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 ~391 KB and ~782 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
72 requests over 4572ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s FCP 2.7 s LCP 3.5 shttps://asm.org// https://asm.org/ — 200 — 43.4 KiB — 1.2 s — h2https://use.fontawesome.com/releases/v6.4.2/css/all.cssuse.fontawesome.com/releases/v6.4.2... https://use.fontawesome.com/releases/v6.4.2/css/all.css — 200 — 24.3 KiB — 25 ms — h2https://asm.org/content/dist/style.min.css?v=1444e28fd9daba4943019f0fc18061370f879ce54421773b49c675dbea8a686a/content/dist/style.min.css?v=1444e... https://asm.org/content/dist/style.min.css?v=1444e28fd9daba4943019f0fc18061370f879ce54421773b49c675dbea8a686a — 200 — 72.8 KiB — 735 ms — h2https://asm.org/content/dist/master.min.css?v=0f9d8aeb992adb4f437fd7df9999dfe9d5c2748123a994729a03e1c6707169c9/content/dist/master.min.css?v=0f9d... https://asm.org/content/dist/master.min.css?v=0f9d8aeb992adb4f437fd7df9999dfe9d5c2748123a994729a03e1c6707169c9 — 200 — 7.3 KiB — 261 ms — h2https://asm.org/Kentico/Content/Widgets/RichText/froala_style.css/Kentico/Content/Widgets/RichText/f... https://asm.org/Kentico/Content/Widgets/RichText/froala_style.css — 200 — 5.3 KiB — 485 ms — h2https://asm.org/Content/Widgets/Shared/wrapper.css/Content/Widgets/Shared/wrapper.css https://asm.org/Content/Widgets/Shared/wrapper.css — 301 — 3.0 KiB — 259 ms — h2https://cmp.osano.com/16CXxzUMyG0rk3ynA/80d48381-f550-4573-96db-e6de4a4cd97b/osano.jscmp.osano.com/16CXxzUMyG0rk3ynA/80d... https://cmp.osano.com/16CXxzUMyG0rk3ynA/80d48381-f550-4573-96db-e6de4a4cd97b/osano.js — 200 — 51.4 KiB — 25 ms — h3https://d932.asm.org/script.jsd932.asm.org/script.js https://d932.asm.org/script.js — 404 — 163 B — 35 ms — h2https://asm.org/content/dist/responsive-table.min.js?v=6ff7f0e95c8833ff9ce0dd037bf278383341f34cbc195139ac368cbd694598bc/content/dist/responsive-table.min.... https://asm.org/content/dist/responsive-table.min.js?v=6ff7f0e95c8833ff9ce0dd037bf278383341f34cbc195139ac368cbd694598bc — 200 — 6.9 KiB — 732 ms — h2https://asm.org/content/images/logo.svg?v=07ca27a5342ccf3d818d0de3b8123cf580434db324e21ba818f9ec2e8ed14223/content/images/logo.svg?v=07ca27a5... https://asm.org/content/images/logo.svg?v=07ca27a5342ccf3d818d0de3b8123cf580434db324e21ba818f9ec2e8ed14223 — 200 — 14.0 KiB — 734 ms — h2https://asm.org/getmedia/bb4f3d40-a587-4407-84fe-71cf595d274f/homepage-microbe_try-events-3.jpg/getmedia/bb4f3d40-a587-4407-84fe-7... https://asm.org/getmedia/bb4f3d40-a587-4407-84fe-71cf595d274f/homepage-microbe_try-events-3.jpg — 200 — 326.2 KiB — 997 ms — h2https://asm.org/content/widgets/shared/wrapper.css/content/widgets/shared/wrapper.css https://asm.org/content/widgets/shared/wrapper.css — 200 — 3.1 KiB — 729 ms — h2https://fonts.googleapis.com/css?family=Source+Serif+Pro:400,600,700fonts.googleapis.com/css?family=Sou... https://fonts.googleapis.com/css?family=Source+Serif+Pro:400,600,700 — 200 — 1.2 KiB — 13 ms — h2https://asm.org/content/images/logo-footer.svg?v=eba5e794a49dfb73f75087af193ec5cb5fcbfdd6a1ffdd2924615de2f3cac7e2/content/images/logo-footer.svg?v=e... https://asm.org/content/images/logo-footer.svg?v=eba5e794a49dfb73f75087af193ec5cb5fcbfdd6a1ffdd2924615de2f3cac7e2 — 200 — 14.1 KiB — 491 ms — h2blob:https://asm.org/b4f884af-de3a-44c0-bbac-63bc034fc96easm.org/b4f884af-de3a-44c0-bbac-63b... blob:https://asm.org/b4f884af-de3a-44c0-bbac-63bc034fc96e — 200 — -1 B — 200 ms — blobhttps://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.jsajax.googleapis.com/ajax/libs/jquer... https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js — 200 — 30.2 KiB — 22 ms — h2https://asm.org/content/dist/vendor.min.js?v=5682bf5710d3865078d0ab8eba45612074be8ac27f3fe7a281ee9de3f2caff90/content/dist/vendor.min.js?v=5682b... https://asm.org/content/dist/vendor.min.js?v=5682bf5710d3865078d0ab8eba45612074be8ac27f3fe7a281ee9de3f2caff90 — 200 — 368.0 KiB — 434 ms — 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h2https://asm.org/content/dist/assets/linearicons.ttf/content/dist/assets/linearicons.tt... https://asm.org/content/dist/assets/linearicons.ttf — 200 — 421.2 KiB — 470 ms — h2https://cmp.osano.com/16CXxzUMyG0rk3ynA/80d48381-f550-4573-96db-e6de4a4cd97b/osano-ui.jscmp.osano.com/16CXxzUMyG0rk3ynA/80d... https://cmp.osano.com/16CXxzUMyG0rk3ynA/80d48381-f550-4573-96db-e6de4a4cd97b/osano-ui.js — 200 — 29.1 KiB — 10 ms — h3https://cmp.osano.com/16CXxzUMyG0rk3ynA/80d48381-f550-4573-96db-e6de4a4cd97b/en.jsoncmp.osano.com/16CXxzUMyG0rk3ynA/80d... https://cmp.osano.com/16CXxzUMyG0rk3ynA/80d48381-f550-4573-96db-e6de4a4cd97b/en.json — 200 — 0 B — 684 ms — h3https://asm.org/api/bookmarks/loadBookmarks/api/bookmarks/loadBookmarks https://asm.org/api/bookmarks/loadBookmarks — 301 — 3.0 KiB — 357 ms — h2https://cdn.propfuel.com/build/assets/plugin-BDDMTtXp.jscdn.propfuel.com/build/assets/plugi... https://cdn.propfuel.com/build/assets/plugin-BDDMTtXp.js — 200 — 3.1 KiB — 219 ms — h2https://www.youtube.com/s/player/218d9d92/www-widgetapi.vflset/www-widgetapi.jswww.youtube.com/s/player/218d9d92/w... https://www.youtube.com/s/player/218d9d92/www-widgetapi.vflset/www-widgetapi.js — 200 — 10.6 KiB — 17 ms — h2https://asmusa.informz.net/web_trk/collector/?e=pv&url=https%3A%2F%2Fasm.org%2F&page=American%20Society%20for%20Microbiology&tv=js-2.5.3&tna=infz&aid=12BC3C42-28B9-4C07-8A27-5D04B75CDC03&p=web&tz=UTC&lang=en-US&cs=UTF-8&f_pdf=1&f_qt=0&f_realp=0&f_wma=0&f_dir=0&f_fla=0&f_java=0&f_gears=0&f_ag=0&res=800x600&cd=24&cookie=1&eid=a41fa305-d08a-44ba-b323-104aabf409da&dtm=1776806556571&vp=1350x940&ds=1350x3890&vid=1&sid=a0a6a9d8-730b-425b-a7e6-64f64ccba099&duid=7f53dcf5f247b99e&fp=2557719908asmusa.informz.net/web_trk/collecto... https://asmusa.informz.net/web_trk/collector/?e=pv&url=https%3A%2F%2Fasm.org%2F&page=American%20Society%20for%20Microbiology&tv=js-2.5.3&tna=infz&aid=12BC3C42-28B9-4C07-8A27-5D04B75CDC03&p=web&tz=UTC&lang=en-US&cs=UTF-8&f_pdf=1&f_qt=0&f_realp=0&f_wma=0&f_dir=0&f_fla=0&f_java=0&f_gears=0&f_ag=0&res=800x600&cd=24&cookie=1&eid=a41fa305-d08a-44ba-b323-104aabf409da&dtm=1776806556571&vp=1350x940&ds=1350x3890&vid=1&sid=a0a6a9d8-730b-425b-a7e6-64f64ccba099&duid=7f53dcf5f247b99e&fp=2557719908 — 200 — 1.1 KiB — 924 ms — h2https://asm.org/api/bookmarks/loadbookmarks/api/bookmarks/loadbookmarks https://asm.org/api/bookmarks/loadbookmarks — 404 — 6.8 KiB — 254 ms — h2https://eastus2-0.in.applicationinsights.azure.com//v2/trackeastus2-0.in.applicationinsights.az... https://eastus2-0.in.applicationinsights.azure.com//v2/track — 204 — 0 B — 1.1 s — h2https://asm.org/favicon.ico?v=070b24788dbbb99448c3d0f494ee4105a3483347c7349a2a5336fe83ac97a9fc/favicon.ico?v=070b24788dbbb99448c3... https://asm.org/favicon.ico?v=070b24788dbbb99448c3d0f494ee4105a3483347c7349a2a5336fe83ac97a9fc — 200 — 166.2 KiB — 266 ms — h2https://www.google-analytics.com/g/collect?v=2&tid=G-864FXWB263&gtm=45be64h1v898313424z876046539za20gzb76046539zd76046539&_p=1776806555666&gcs=G100&gcd=13p3p3p3p5l1&npa=1&dma_cps=-&dma=0&are=1&cid=240722411.1776806557&frm=0&pscdl=denied&rcb=9&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=0~115616985~115938466~115938469~117266400&sid=1776806556&sct=1&seg=0&dl=https%3A%2F%2Fasm.org%2F&dt=American%20Society%20for%20Microbiology&_tu=CA&en=page_view&_fv=1&_nsi=1&_ss=1&tfd=3356www.google-analytics.com/g/collect?... https://www.google-analytics.com/g/collect?v=2&tid=G-864FXWB263&gtm=45be64h1v898313424z876046539za20gzb76046539zd76046539&_p=1776806555666&gcs=G100&gcd=13p3p3p3p5l1&npa=1&dma_cps=-&dma=0&are=1&cid=240722411.1776806557&frm=0&pscdl=denied&rcb=9&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=0~115616985~115938466~115938469~117266400&sid=1776806556&sct=1&seg=0&dl=https%3A%2F%2Fasm.org%2F&dt=American%20Society%20for%20Microbiology&_tu=CA&en=page_view&_fv=1&_nsi=1&_ss=1&tfd=3356 — 204 — 543 B — 77 ms — h2https://cmp.osano.com/16CXxzUMyG0rk3ynA/80d48381-f550-4573-96db-e6de4a4cd97b/en.jsoncmp.osano.com/16CXxzUMyG0rk3ynA/80d... https://cmp.osano.com/16CXxzUMyG0rk3ynA/80d48381-f550-4573-96db-e6de4a4cd97b/en.json — 200 — 2.8 KiB — 6 ms — h3https://www.google-analytics.com/g/collect?v=2&tid=G-MZTPXVJ8R2&gtm=45je64h1v877460568z876046539za20gzb76046539zd76046539&_p=1776806555666&gcs=G100&gcd=13p3p3p3p5l1&npa=1&dma_cps=-&dma=0&_eu=AAAAAGA&are=1&cid=240722411.1776806557&frm=0&pscdl=denied&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&dl=https%3A%2F%2Fasm.org%2F&sid=1776806556&sct=1&seg=0&dt=American%20Society%20for%20Microbiology&_tu=CA&en=page_view&_fv=1&_ss=1&ep.event_type=default&ep.hash=&ep.gtm_version=GTM-5BH7J8M%3A264&ep.audience=&ep.topic=&ep.contentType=&ep.keywords=&ep.pub_date=N%2FA&ep.page_age=N%2FA&ep.logged_in_event=logged-out&epn.event_timestamp=1776806556057&ep.membership_type=non-member&ep.troubleshoot=https%3A%2F%2Fasm.org%2F&epn.word_count=35&epn.link_density=0&epn.total_pdfs_on_page=0&epn.expected_read_time_in_min=1&up.membership_type=non-member&up.logged_in_status=logged-out&tfd=3414www.google-analytics.com/g/collect?... https://www.google-analytics.com/g/collect?v=2&tid=G-MZTPXVJ8R2&gtm=45je64h1v877460568z876046539za20gzb76046539zd76046539&_p=1776806555666&gcs=G100&gcd=13p3p3p3p5l1&npa=1&dma_cps=-&dma=0&_eu=AAAAAGA&are=1&cid=240722411.1776806557&frm=0&pscdl=denied&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&dl=https%3A%2F%2Fasm.org%2F&sid=1776806556&sct=1&seg=0&dt=American%20Society%20for%20Microbiology&_tu=CA&en=page_view&_fv=1&_ss=1&ep.event_type=default&ep.hash=&ep.gtm_version=GTM-5BH7J8M%3A264&ep.audience=&ep.topic=&ep.contentType=&ep.keywords=&ep.pub_date=N%2FA&ep.page_age=N%2FA&ep.logged_in_event=logged-out&epn.event_timestamp=1776806556057&ep.membership_type=non-member&ep.troubleshoot=https%3A%2F%2Fasm.org%2F&epn.word_count=35&epn.link_density=0&epn.total_pdfs_on_page=0&epn.expected_read_time_in_min=1&up.membership_type=non-member&up.logged_in_status=logged-out&tfd=3414 — 204 — 48 B — 20 ms — h2https://pagead2.googlesyndication.com/ccm/collect?rcb=1&frm=0&ae=g&en=page_view&dl=https%3A%2F%2Fasm.org%2F&scrsrc=www.googletagmanager.com&rnd=701675919.1776806557&navt=n&npa=1&us_privacy=1---&ep.ads_data_redaction=1&_tu=CA&gtm=45He64h1v76046539za200zd76046539xea&gcs=G100&gcd=13p3p3p3p5l1&dma_cps=-&dma=0&tag_exp=0~115616986~115938466~115938469~117266401&apve=1&apvf=f&apvc=1&tft=1776806557097&tfd=3417pagead2.googlesyndication.com/ccm/c... https://pagead2.googlesyndication.com/ccm/collect?rcb=1&frm=0&ae=g&en=page_view&dl=https%3A%2F%2Fasm.org%2F&scrsrc=www.googletagmanager.com&rnd=701675919.1776806557&navt=n&npa=1&us_privacy=1---&ep.ads_data_redaction=1&_tu=CA&gtm=45He64h1v76046539za200zd76046539xea&gcs=G100&gcd=13p3p3p3p5l1&dma_cps=-&dma=0&tag_exp=0~115616986~115938466~115938469~117266401&apve=1&apvf=f&apvc=1&tft=1776806557097&tfd=3417 — 200 — 21 B — 119 ms — h3https://pagead2.googlesyndication.com/ccm/collect?rcb=9&frm=0&en=page_view&dl=https%3A%2F%2Fasm.org%2F&scrsrc=www.googletagmanager.com&rnd=701675919.1776806557&navt=n&npa=1&us_privacy=1---&_tu=CA&gtm=45be64h1v898313424z876046539za20gzb76046539zd76046539xec&gcs=G100&gcd=13p3p3p3p5l1&dma_cps=-&dma=0&tag_exp=0~115616985~115938466~115938469~117266400&apve=1&apvf=f&apvc=0&tids=AW-858234627&tid=AW-858234627&tft=1776806557098&tfd=3418pagead2.googlesyndication.com/ccm/c... https://pagead2.googlesyndication.com/ccm/collect?rcb=9&frm=0&en=page_view&dl=https%3A%2F%2Fasm.org%2F&scrsrc=www.googletagmanager.com&rnd=701675919.1776806557&navt=n&npa=1&us_privacy=1---&_tu=CA&gtm=45be64h1v898313424z876046539za20gzb76046539zd76046539xec&gcs=G100&gcd=13p3p3p3p5l1&dma_cps=-&dma=0&tag_exp=0~115616985~115938466~115938469~117266400&apve=1&apvf=f&apvc=0&tids=AW-858234627&tid=AW-858234627&tft=1776806557098&tfd=3418 — 200 — 21 B — 118 ms — h3https://pagead2.googlesyndication.com/ccm/collect?rcb=13&frm=0&en=page_view&dl=https%3A%2F%2Fasm.org%2F&scrsrc=www.googletagmanager.com&rnd=701675919.1776806557&navt=n&npa=1&us_privacy=1---&_tu=CA&gtm=45be64h1v875605018z876046539za20gzb76046539zd76046539xec&gcs=G100&gcd=13p3p3p3p5l1&dma_cps=-&dma=0&tag_exp=0~115938466~115938469~117266400~117884344&apve=1&apvf=f&apvc=0&tids=AW-855308285&tid=AW-855308285&tft=1776806557100&tfd=3420pagead2.googlesyndication.com/ccm/c... https://pagead2.googlesyndication.com/ccm/collect?rcb=13&frm=0&en=page_view&dl=https%3A%2F%2Fasm.org%2F&scrsrc=www.googletagmanager.com&rnd=701675919.1776806557&navt=n&npa=1&us_privacy=1---&_tu=CA&gtm=45be64h1v875605018z876046539za20gzb76046539zd76046539xec&gcs=G100&gcd=13p3p3p3p5l1&dma_cps=-&dma=0&tag_exp=0~115938466~115938469~117266400~117884344&apve=1&apvf=f&apvc=0&tids=AW-855308285&tid=AW-855308285&tft=1776806557100&tfd=3420 — 200 — 21 B — 114 ms — h3https://eastus2-0.in.applicationinsights.azure.com//v2/trackeastus2-0.in.applicationinsights.az... https://eastus2-0.in.applicationinsights.azure.com//v2/track — 200 — 166 B — 351 ms — h2
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
67% of JavaScript execution is third-party
First-party Third-party 834ms · 712KB · €9/mo
Google Tag Manager
Tag Manager
Costly
Execution 207ms
Transfer 173 KB
Unused 33%
Monthly Cost €2/mo
Unattributable
Other
Optional
Execution 172ms
Transfer 0 KB
Monthly Cost €2/mo
cmp.osano.com
Other
Optional
Execution 156ms
Transfer 51 KB
Monthly Cost €2/mo
Google Tag Manager
Tag Manager
Optional
Execution 155ms
Transfer 173 KB
Unused 40%
Monthly Cost €2/mo
Google Tag Manager
Tag Manager
Optional
Execution 88ms
Transfer 167 KB
Unused 37%
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 56ms
Transfer 148 KB
Unused 43%
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • Google Tag Manager adds 207ms and costs ~€2/month

67% of JavaScript execution time comes from third-party scripts.

Why this matters

Third-party scripts (analytics, ads, social, A/B testing) often dominate execution time — every one is a perf-and-privacy tax.

Learn more ▾

Each third-party script is a black box: you don't control when it loads, what it executes, or how much it grows. They often account for a major share of total blocking time on average sites (HTTP Archive's Web Almanac documents the trend). Audit which ones you actually need, defer the rest, and use facade patterns (lite-youtube, lite-vimeo) for embedded media.

Source: web.dev / HTTP Archive Web Almanac

Google Tag Manager takes 207ms 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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