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https://physiology.org

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
67
GRADE
D
FIX
5
REVIEW
3
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.
77
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.
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.

1.85 s

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

4.21 s

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

14 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.

2.80 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.

5.09 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 3 REVIEW 5 FIX
F
Page Weight Budget
Action
6.9 MB transferred, 114 requests
FIX
6.9 MB transferred, 114 requests
Critical::
Page weighs 11.0 MB (6.9 MB transferred)
Warning::
Images are 4.9 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 4.9 MB
Warning::
JavaScript is 1.8 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.8 MB
Warning::
114 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 1.5 g CO2 per page load
6.9 MB / 2.4 MB budget
6.9 MB transferred
114 requests
1.5 g CO2 per page load
Images 4.9 MiB 70%
JavaScript 1.8 MiB 26%
Other 95.8 KiB 1%
Fonts 87.7 KiB 1%
CSS 51.8 KiB 1%
HTML 17.4 KiB 0%
Other 12.1 KiB 0%
Other 10.3 KiB 0%
Other 561 B 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Over budget

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

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

Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.

Why this matters

High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.

Source: web.dev

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 (6.9 MiB of 6.9 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Bundles
Action
33 scripts, 705 KB unused
FIX
33 scripts, 705 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-L6BS...: 116 KB unused (65%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-MEZB...: 72 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-L6BS...: 70 KB unused (39%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-2XWC...: 67 KB unused (43%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-70HB...: 67 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 705 KB
705 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-L6BSPLN5JH&cx=c&gtm=4e64h1178 KB116 KB (65%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-MEZBQL4HVQ&cx=c&gtm=4e64h1173 KB72 KB (42%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-L6BSPLN5JH179 KB70 KB (39%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-2XWCGG40TY&cx=c&gtm=4e64h1157 KB67 KB (43%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-70HB0WWZEK&cx=c&gtm=4e64h1157 KB67 KB (42%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-M5KQQHZ4D6&cx=c&gtm=4e64h1157 KB66 KB (42%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-JNGKZ7FE80&cx=c&gtm=4e64h1157 KB66 KB (42%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-PQ4M2JG8XQ&cx=c&gtm=4e64h1160 KB66 KB (41%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-TB3ZPRK149 KB58 KB (39%)✓3rd
https://script.crazyegg.com/pages/versioned/commontransformations-scripts/df706026807a27b189c4eeedc429ebbf.js72 KB35 KB (49%)✓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
114 resources · 6.9 MB · 705 KB savings available
FIX
114 resources · 6.9 MB · 705 KB savings available
Warning::
Page weight 5.9 MB over 1MB target
Got: 6.9 MB Expected: ≤ 1 MB
Info::
~705 KB of savings available
Warning::
113 third-party resources (100% of weight)
Info::
7 resources over 200KB
114 resources · 6.9 MiB · 113 third-party 5.9 MiB over 1MB target
Image 70% · 4.9 MiB
JavaScript 26% · 1.8 MiB
CSS 2% · 146.0 KiB
Font 1% · 87.7 KiB
Document 0% · 21.3 KiB
Other 0% · 14.7 KiB

~704.5 KiB of savings available

Remove unused JavaScript: 704.5 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
Image Optimization
Action
40 images, 0 KB saveable
REVIEW
40 images, 0 KB saveable
Warning::
https://www.physiology.org/images/default-source/p... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.physiology.org/images/default-source/a... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.physiology.org/images/default-source/p... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.physiology.org/images/default-source/p... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.physiology.org/images/default-source/p... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.physiology.org/images/default-source/p... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.physiology.org/images/default-source/p... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.physiology.org/images/default-source/p... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.physiology.org/images/default-source/p... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.physiology.org/images/default-source/p... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.physiology.org/images/default-source/p... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.physiology.org/images/default-source/p... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.physiology.org/images/default-source/a... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.physiology.org/images/default-source/p... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.physiology.org/images/default-source/p... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.physiology.org/images/default-source/p... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.physiology.org/images/default-source/p... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.physiology.org/images/default-source/p... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.physiology.org/images/default-source/p... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.physiology.org/images/default-source/a... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.physiology.org/images/default-source/p... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.physiology.org/images/default-source/p... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.physiology.org/images/default-source/p... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.physiology.org/images/default-source/p... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.physiology.org/images/default-source/p... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.physiology.org/images/default-source/p... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
40 images 4.9 MB
0 oversized -0 KB
39 legacy format
26 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

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
784ms total JS execution
REVIEW
784ms total JS execution
Info::
https://www.physiology.org/?SSO=Y: 140ms CPU time
Info::
Unattributable: 111ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-L6BS...: 104ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-TB3...: 75ms CPU time
Info::
https://script.crazyegg.com/pages/versioned/common...: 71ms CPU time
Warning::
Third-party scripts: 784ms (100% of total)

Main Thread Breakdown

Script Evaluation 61% Other 15% Script Parsing & Compilation 11% Style & Layout 10%
ScriptTotalScriptingParse/CompileParty
https://www.physiology.org/?SSO=Y140ms20ms1ms3rd
Unattributable111ms4ms0ms3rd
https://www.googletagmanager.com/gtag/js?id=G-L6BSPLN5JH104ms86ms17ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-TB3ZPRK75ms57ms15ms3rd
https://script.crazyegg.com/pages/versioned/commontransformations-scripts/df706026807a27b189c4eeedc429ebbf.js71ms62ms6ms3rd
https://www.physiology.org/ResourcePackages/APS/assets/scripts/skrollr.min.js65ms25ms0ms3rd
https://www.googletagmanager.com/gtag/js?id=G-PQ4M2JG8XQ&cx=c&gtm=4e64h160ms46ms14ms3rd
https://www.googletagmanager.com/gtag/js?id=G-MEZBQL4HVQ&cx=c&gtm=4e64h153ms43ms9ms3rd
https://www.googletagmanager.com/gtag/js?id=G-70HB0WWZEK&cx=c&gtm=4e64h152ms44ms8ms3rd
https://www.googletagmanager.com/gtag/js?id=G-JNGKZ7FE80&cx=c&gtm=4e64h152ms44ms8ms3rd
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
4 fonts (88 KB)
PASS
4 fonts (88 KB)
Info::
4 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

4

88 KB total

Render-blocking

0

of 4

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 FCP 1.9 s LCP 4.2 shttps://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-solid-900-0.woff2pro-fa-solid-900-0.woff2 https://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-solid-900-0.woff2 — 11.8 KiB — 30 ms — font-display: swaphttps://fonts.gstatic.com/s/nunitosans/v19/pe0TMImSLYBIv1o4X1M8ce2xCx3yop4tQpF_MeTm0lfGWVpNn64CL7U8upHZIbMV51Q42ptCp7t1R-tQKr51.woff2pe0TMImSLYBIv1o4X1M8ce2... https://fonts.gstatic.com/s/nunitosans/v19/pe0TMImSLYBIv1o4X1M8ce2xCx3yop4tQpF_MeTm0lfGWVpNn64CL7U8upHZIbMV51Q42ptCp7t1R-tQKr51.woff2 — 30.3 KiB — 42 ms — font-display: swaphttps://fonts.gstatic.com/s/nunitosans/v19/pe0RMImSLYBIv1o4X1M8cce4OdVisMz5nZRqy6cmmmU3t2FQWEAEOvV9wNvrwlNstMKW3Y6K5WMwd-laLZx3lE4.woff2pe0RMImSLYBIv1o4X1M8cce... https://fonts.gstatic.com/s/nunitosans/v19/pe0RMImSLYBIv1o4X1M8cce4OdVisMz5nZRqy6cmmmU3t2FQWEAEOvV9wNvrwlNstMKW3Y6K5WMwd-laLZx3lE4.woff2 — 32.2 KiB — 52 ms — font-display: swaphttps://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-solid-900-13.woff2pro-fa-solid-900-13.woff2 https://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-solid-900-13.woff2 — 13.5 KiB — 31 ms — font-display: swap
pro-fa-solid-900-0.woff2 woff2 swap
Size 12 KB
Load time 30 ms
Start 1.8 s
Risk FOUT — text flashes from fallback to web font
pe0TMImSLYBIv1o4X1M8ce2... woff2 swap
Size 30 KB
Load time 42 ms
Start 1.8 s
Risk FOUT — text flashes from fallback to web font
pe0RMImSLYBIv1o4X1M8cce... woff2 swap
Size 32 KB
Load time 52 ms
Start 1.8 s
Risk FOUT — text flashes from fallback to web font
pro-fa-solid-900-13.woff2 woff2 swap
Size 13 KB
Load time 31 ms
Start 1.8 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)
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
114 requests over 3019ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s FCP 1.9 s LCP 4.2 shttps://physiology.org// https://physiology.org/ — 301 — 88 B — 289 ms — h2https://www.physiology.org/www.physiology.org/ https://www.physiology.org/ — 302 — 273 B — 169 ms — h2https://ebus.physiology.org/SSO/?vi=12&vt=60a7f8ee5f8781c2a329d92aee75a769f36183302c5d89c4e5c38f18cb40aad5be9cb17f3898fd772725eb563a901f1ef222c728f35d2d65020433d3760e66fc&DPLF=Yebus.physiology.org/SSO/?vi=12&vt=6... https://ebus.physiology.org/SSO/?vi=12&vt=60a7f8ee5f8781c2a329d92aee75a769f36183302c5d89c4e5c38f18cb40aad5be9cb17f3898fd772725eb563a901f1ef222c728f35d2d65020433d3760e66fc&DPLF=Y — 302 — 1.5 KiB — 391 ms — 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https://apsoc.informz.net/web_trk/collector/?e=pv&url=https%3A%2F%2Fwww.physiology.org%2F%3FSSO%3DY&page=American%20Physiological%20Society%20%7C%20Advancing%20Scientific%20Discovery%20%7C%20American%20Physiological%20Society&tv=js-2.5.3&tna=infz&aid=F8646FCE-FDE6-4A98-A1AD-0DE18B3632C7&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=862bed92-bdfa-4811-9c6e-091861a20069&dtm=1776813851234&vp=1350x940&ds=1350x3706&vid=1&sid=efa8bafe-c938-4346-9086-b2c3d83da117&duid=ef7ae6f351ae7816&fp=3534403361 — 200 — 1.1 KiB — 298 ms — h2https://apsoc.informz.net/web_trk/collector/?e=pv&url=https%3A%2F%2Fwww.physiology.org%2F%3FSSO%3DY&page=American%20Physiological%20Society%20%7C%20Advancing%20Scientific%20Discovery%20%7C%20American%20Physiological%20Society&tv=js-2.5.3&tna=infz&aid=F8646FCE-FDE6-4A98-A1AD-0DE18B3632C7&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=862bed92-bdfa-4811-9c6e-091861a20069&dtm=1776813851234&vp=1350x940&ds=1350x3706&vid=1&sid=efa8bafe-c938-4346-9086-b2c3d83da117&duid=ef7ae6f351ae7816&fp=3534403361apsoc.informz.net/web_trk/collector... https://apsoc.informz.net/web_trk/collector/?e=pv&url=https%3A%2F%2Fwww.physiology.org%2F%3FSSO%3DY&page=American%20Physiological%20Society%20%7C%20Advancing%20Scientific%20Discovery%20%7C%20American%20Physiological%20Society&tv=js-2.5.3&tna=infz&aid=F8646FCE-FDE6-4A98-A1AD-0DE18B3632C7&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=862bed92-bdfa-4811-9c6e-091861a20069&dtm=1776813851234&vp=1350x940&ds=1350x3706&vid=1&sid=efa8bafe-c938-4346-9086-b2c3d83da117&duid=ef7ae6f351ae7816&fp=3534403361 — 200 — 1.1 KiB — 398 ms — h2https://match.adsrvr.org/track/cmf/generic?gdpr=0&ttd_passthrough=a_id%3D5b9ff69bf474f4202a87289b&ttd_pid=6fgi4r1&ttd_puid=69e8071aed071340cb86fa83&ttd_tpi=1match.adsrvr.org/track/cmf/generic?... https://match.adsrvr.org/track/cmf/generic?gdpr=0&ttd_passthrough=a_id%3D5b9ff69bf474f4202a87289b&ttd_pid=6fgi4r1&ttd_puid=69e8071aed071340cb86fa83&ttd_tpi=1 — 200 — 149 B — 107 ms — h2https://script.crazyegg.com/pages/data-scripts/0103/9167/sampling/www.physiology.org.json?t=1script.crazyegg.com/pages/data-scri... https://script.crazyegg.com/pages/data-scripts/0103/9167/sampling/www.physiology.org.json?t=1 — 200 — 399 B — 24 ms — h3https://tracking.crazyegg.com/clock?u=1039167&st=377511&t=1776813851322&tk=d7afba7527a00ed229ec6836369f3867tracking.crazyegg.com/clock?u=10391... https://tracking.crazyegg.com/clock?u=1039167&st=377511&t=1776813851322&tk=d7afba7527a00ed229ec6836369f3867 — 204 — 0 B — 125 ms — h2https://pagestates-tracking.crazyegg.com/healthcheckpagestates-tracking.crazyegg.com/he... https://pagestates-tracking.crazyegg.com/healthcheck — 200 — 462 B — 28 ms — h2https://assets-tracking.crazyegg.com/healthcheckassets-tracking.crazyegg.com/health... https://assets-tracking.crazyegg.com/healthcheck — 200 — 460 B — 9 ms — h2blob:https://www.physiology.org/56cf80c7-b4c2-4f80-a7cd-c20f77302ae1www.physiology.org/56cf80c7-b4c2-4f... blob:https://www.physiology.org/56cf80c7-b4c2-4f80-a7cd-c20f77302ae1 — 200 — -1 B — 7 ms — blobhttps://www.physiology.org/ResourcePackages/APS/assets/images/favicon-32x32.pngwww.physiology.org/ResourcePackages... https://www.physiology.org/ResourcePackages/APS/assets/images/favicon-32x32.png — 200 — 6.0 KiB — 103 ms — h2https://tracking.crazyegg.com/clock?u=1039167&st=377511&t=1776813851322&tk=d7afba7527a00ed229ec6836369f3867tracking.crazyegg.com/clock?u=10391... https://tracking.crazyegg.com/clock?u=1039167&st=377511&t=1776813851322&tk=d7afba7527a00ed229ec6836369f3867 — 200 — 147 B — 110 ms — h2blob:https://www.physiology.org/a1ee3d4b-903f-4e51-8449-2911973e56f6www.physiology.org/a1ee3d4b-903f-4e... blob:https://www.physiology.org/a1ee3d4b-903f-4e51-8449-2911973e56f6 — -1 — 0 B — 0 ms — https://script.crazyegg.com/pages/versioned/tracking-scripts/158692313dc4b9f2e28d9e9025e38d6b.jsscript.crazyegg.com/pages/versioned... https://script.crazyegg.com/pages/versioned/tracking-scripts/158692313dc4b9f2e28d9e9025e38d6b.js — 200 — 22.6 KiB — 25 ms — h3
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
100% of JavaScript execution is third-party
First-party Third-party 784ms · 1077KB · €9/mo
www.physiology.org
Other
Optional
Execution 140ms
Transfer 17 KB
Monthly Cost €2/mo
Unattributable
Other
Optional
Execution 111ms
Transfer 0 KB
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 104ms
Transfer 179 KB
Unused 39%
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 75ms
Transfer 149 KB
Unused 39%
Monthly Cost €1/mo
script.crazyegg.com
Other
Optional
Execution 71ms
Transfer 72 KB
Unused 49%
Monthly Cost €1/mo
www.physiology.org
Other
Optional
Execution 65ms
Transfer 12 KB
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 60ms
Transfer 160 KB
Unused 41%
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 53ms
Transfer 173 KB
Unused 42%
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 52ms
Transfer 157 KB
Unused 42%
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 52ms
Transfer 157 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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