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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
90
GRADE
A
FIX
4
REVIEW
2
PASS
7
INFO
2

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

Mobile Desktop
55
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
96
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.

1.63 s

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

2.72 s

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

0 ms

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

0.608

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

1.66 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.

2.74 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
7 PASS 2 REVIEW 4 FIX
F
Page Weight Budget
Action
3.4 MB transferred, 73 requests
FIX
3.4 MB transferred, 73 requests
Warning::
Page weighs 6.8 MB (3.4 MB transferred)
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::
Images are 1.3 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.3 MB
Info::
73 HTTP requests
Info::
Estimated 0.72 g CO2 per page load
3.4 MB / 2.4 MB budget
3.4 MB transferred
73 requests
0.72 g CO2 per page load
JavaScript 1.8 MiB 52%
Images 1.3 MiB 38%
CSS 199.5 KiB 6%
HTML 83.2 KiB 2%
Other 47.5 KiB 1%
Fonts 15.3 KiB 0%
Other 2.6 KiB 0%
Other 1.5 KiB 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

F
JS Bundles
Action
23 scripts, 675 KB unused
FIX
23 scripts, 675 KB unused
Warning::
https://design-system.open.ac.uk/component-library...: 159 KB unused (26%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://sgtm.open.ac.uk/gtm.js?id=GTM-PPS2SH: 94 KB unused (48%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.open.ac.uk/analytics/gtd?id=AW-1071443...: 74 KB unused (52%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.open.ac.uk/analytics/?id=G-Z74G55VLY4&...: 71 KB unused (39%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.open.ac.uk/analytics/?id=G-43365CF947&...: 70 KB unused (43%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 675 KB
675 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://design-system.open.ac.uk/component-library/dist/v1.19.15/library.js605 KB159 KB (26%)✓3rd
https://sgtm.open.ac.uk/gtm.js?id=GTM-PPS2SH194 KB94 KB (48%)✓3rd
https://www.open.ac.uk/analytics/gtd?id=AW-1071443088&cx=c&gtm=4e64h1143 KB74 KB (52%)✓1st
https://www.open.ac.uk/analytics/?id=G-Z74G55VLY4&cx=c&gtm=4e64h1180 KB71 KB (39%)✓1st
https://www.open.ac.uk/analytics/?id=G-43365CF947&cx=c&gtm=4e64h1162 KB70 KB (43%)✓1st
https://www.open.ac.uk/analytics/gtd?id=DC-11438607&cx=c&gtm=4e64h1138 KB70 KB (51%)✓1st
https://www.open.ac.uk/analytics/205 KB64 KB (31%)✓1st
https://de.cdn-v3.conductrics.com/ac-LXFBNkXiNm/v3/agent-api/js/f-dWyHnIAdDA/dt-EzQ29xSsSbrFdEypQszyo9LrPicxDP?apikey=api-Yj4rznDbbdMSfZflSxhm7BLtxY48 KB33 KB (70%)✓3rd
https://www.open.ac.uk/oudigital/v5/eep/js/vendor/jquery-3.5.1.min.js30 KB21 KB (69%)✓1st
https://www.open.ac.uk/oudigital/v5/eep/js/ou.eep.js24 KB21 KB (87%)✗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
73 resources · 3.4 MB · 675 KB savings available
FIX
73 resources · 3.4 MB · 675 KB savings available
Warning::
Page weight 2.4 MB over 1MB target
Got: 3.4 MB Expected: ≤ 1 MB
Info::
~675 KB of savings available
Info::
22 third-party resources (33% of weight)
Info::
3 resources over 200KB
73 resources · 3.4 MiB · 22 third-party 2.4 MiB over 1MB target
JavaScript 53% · 1.8 MiB
Image 38% · 1.3 MiB
CSS 6% · 199.5 KiB
Document 2% · 86.7 KiB
Font 0% · 15.3 KiB
Other 0% · 8.2 KiB

~675.2 KiB of savings available

Remove unused JavaScript: 675.2 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
Image Optimization
33 images, 0 KB saveable
REVIEW
33 images, 0 KB saveable
Info::
All images are well-optimized
33 images 1.3 MB
0 oversized -0 KB
22 legacy format
0 missing dimensions CLS risk
B
JS Execution Cost
558ms total JS execution
REVIEW
558ms total JS execution
Info::
https://www.open.ac.uk/analytics/: 203ms CPU time
Info::
Unattributable: 116ms CPU time
Info::
https://www.open.ac.uk/: 100ms CPU time
Info::
https://www.open.ac.uk/analytics/gtd?id=AW-1071443...: 81ms CPU time
Info::
https://cscript-cdn-irl.cassiecloud.com/loader.js: 59ms CPU time
Info::
Third-party scripts: 175ms (31% of total)

Main Thread Breakdown

Script Evaluation 56% Other 17% Script Parsing & Compilation 12% Style & Layout 9%
ScriptTotalScriptingParse/CompileParty
https://www.open.ac.uk/analytics/203ms174ms19ms1st
Unattributable116ms2ms0ms3rd
https://www.open.ac.uk/100ms4ms1ms1st
https://www.open.ac.uk/analytics/gtd?id=AW-1071443088&cx=c&gtm=4e64h181ms73ms8ms1st
https://cscript-cdn-irl.cassiecloud.com/loader.js59ms36ms11ms3rd
A
Third-Party Impact
33% third-party, 0 ms blocking
PASS
33% third-party, 0 ms blocking
Info::
Third-party code accounts for 33% of page weight (1.1 MiB of 3.4 MiB)
Info::
Third-party blocking time is low (0 ms)
67%
33%
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
2 fonts (15 KB)
PASS
2 fonts (15 KB)
Info::
2 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

2

15 KB total

Render-blocking

0

of 2

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 1.6 s LCP 2.7 sdata:font/woff2;base64,d09GMgABAAAAAB6IAAwAAAAAPlAAAB40AAEAAAAAAAAAAAAAAAAAAAAAAAAAAAAAGx4cLgZgAIFU…woff2;base64,d09GMgABAA... data:font/woff2;base64,d09GMgABAAAAAB6IAAwAAAAAPlAAAB40AAEAAAAAAAAAAAAAAAAAAAAAAAAAAAAAGx4cLgZgAIFU… — 7.6 KiB — 91 ms — font-display: swapdata:font/woff2;base64,d09GMgABAAAAAB7MAAwAAAAAP6AAAB54AAEAAAAAAAAAAAAAAAAAAAAAAAAAAAAAGx4cLgZgAIFU…woff2;base64,d09GMgABAA... data:font/woff2;base64,d09GMgABAAAAAB7MAAwAAAAAP6AAAB54AAEAAAAAAAAAAAAAAAAAAAAAAAAAAAAAGx4cLgZgAIFU… — 7.7 KiB — 91 ms — font-display: swap
woff2;base64,d09GMgABAA... woff2 swap
Size 8 KB
Load time 91 ms
Start 894 ms
Risk FOUT — text flashes from fallback to web font
woff2;base64,d09GMgABAA... woff2 swap
Size 8 KB
Load time 91 ms
Start 895 ms
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
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
73 requests over 2001ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 1.6 s LCP 2.7 shttps://www.open.ac.uk// https://www.open.ac.uk/ — 200 — 83.2 KiB — 139 ms — h2https://de.cdn-v3.conductrics.com/ac-LXFBNkXiNm/v3/agent-api/js/f-dWyHnIAdDA/dt-EzQ29xSsSbrFdEypQszyo9LrPicxDP?apikey=api-Yj4rznDbbdMSfZflSxhm7BLtxYde.cdn-v3.conductrics.com/ac-LXFBNk... https://de.cdn-v3.conductrics.com/ac-LXFBNkXiNm/v3/agent-api/js/f-dWyHnIAdDA/dt-EzQ29xSsSbrFdEypQszyo9LrPicxDP?apikey=api-Yj4rznDbbdMSfZflSxhm7BLtxY — 200 — 47.6 KiB — 532 ms — h2https://www.open.ac.uk/oudigital/v5/eep/js/vendor/jquery-3.5.1.min.js/oudigital/v5/eep/js/vendor/jquery-... https://www.open.ac.uk/oudigital/v5/eep/js/vendor/jquery-3.5.1.min.js — 200 — 30.3 KiB — 47 ms — h2https://www.open.ac.uk/oudigital/v5/eep/js/vendor/jquery.placeholder.js/oudigital/v5/eep/js/vendor/jquery.... https://www.open.ac.uk/oudigital/v5/eep/js/vendor/jquery.placeholder.js — 200 — 1.7 KiB — 27 ms — h2https://www.open.ac.uk/oudigital/v5/eep/js/vendor/jquery.smartresize.js/oudigital/v5/eep/js/vendor/jquery.... https://www.open.ac.uk/oudigital/v5/eep/js/vendor/jquery.smartresize.js — 200 — 484 B — 35 ms — h2https://www.open.ac.uk/oudigital/v5/eep/js/vendor/modernizr-3.6.0.min.js/oudigital/v5/eep/js/vendor/moderni... https://www.open.ac.uk/oudigital/v5/eep/js/vendor/modernizr-3.6.0.min.js — 200 — 6.9 KiB — 32 ms — h2https://www.open.ac.uk/oudigital/v5/eep/js/ou.eep.js/oudigital/v5/eep/js/ou.eep.js https://www.open.ac.uk/oudigital/v5/eep/js/ou.eep.js — 200 — 23.8 KiB — 50 ms — h2https://design-system.open.ac.uk/component-library/dist/v1.19.15/library.cssdesign-system.open.ac.uk/component-... https://design-system.open.ac.uk/component-library/dist/v1.19.15/library.css — 200 — 189.8 KiB — 227 ms — h2https://design-system.open.ac.uk/component-library/dist/v1.19.15/library.jsdesign-system.open.ac.uk/component-... https://design-system.open.ac.uk/component-library/dist/v1.19.15/library.js — 200 — 604.8 KiB — 250 ms — h2https://www.open.ac.uk/ouhome-assets/js/main.js/ouhome-assets/js/main.js https://www.open.ac.uk/ouhome-assets/js/main.js — 200 — 6.1 KiB — 31 ms — h2https://www.open.ac.uk/ouhome-assets/js/search.js/ouhome-assets/js/search.js https://www.open.ac.uk/ouhome-assets/js/search.js — 200 — 4.6 KiB — 44 ms — h2https://www.open.ac.uk/headlines/ouhome2025.js/headlines/ouhome2025.js https://www.open.ac.uk/headlines/ouhome2025.js — 200 — 1.0 KiB — 28 ms — h2https://www.open.ac.uk/ouhome-assets/images/Pink-Img-tab.svg/ouhome-assets/images/Pink-Img-tab.... https://www.open.ac.uk/ouhome-assets/images/Pink-Img-tab.svg — 200 — 322 B — 31 ms — h2https://www.open.ac.uk/ouhome-assets/images/mobile-pink-border.png/ouhome-assets/images/mobile-pink-b... https://www.open.ac.uk/ouhome-assets/images/mobile-pink-border.png — 200 — 7.3 KiB — 27 ms — h2https://www.open.ac.uk/ouhome-assets/images/Registrations.jpg/ouhome-assets/images/Registrations... https://www.open.ac.uk/ouhome-assets/images/Registrations.jpg — 200 — 17.9 KiB — 37 ms — h2https://www.open.ac.uk/ouhome-assets/images/Jaz.webp/ouhome-assets/images/Jaz.webp https://www.open.ac.uk/ouhome-assets/images/Jaz.webp — 200 — 19.1 KiB — 42 ms — h2https://www.open.ac.uk/ouhome-assets/images/Audrey.webp/ouhome-assets/images/Audrey.webp https://www.open.ac.uk/ouhome-assets/images/Audrey.webp — 200 — 10.7 KiB — 27 ms — h2https://www.open.ac.uk/analytics//analytics/ https://www.open.ac.uk/analytics/ — 200 — 204.6 KiB — 122 ms — h2https://sgtm.open.ac.uk/gtm.js?id=GTM-PPS2SHsgtm.open.ac.uk/gtm.js?id=GTM-PPS2S... https://sgtm.open.ac.uk/gtm.js?id=GTM-PPS2SH — 200 — 194.5 KiB — 173 ms — h2https://www.open.ac.uk/ouhome-assets/images/Jake.webp/ouhome-assets/images/Jake.webp https://www.open.ac.uk/ouhome-assets/images/Jake.webp — 200 — 7.2 KiB — 62 ms — h2https://www.open.ac.uk/ouhome-assets/css/style.css?v=1776816155331/ouhome-assets/css/style.css?v=1776... https://www.open.ac.uk/ouhome-assets/css/style.css?v=1776816155331 — 200 — 5.4 KiB — 96 ms — h2https://www.open.ac.uk/ouhome-assets/images/ComputerSciencewithArtificialIntelligence.webp/ouhome-assets/images/ComputerScien... https://www.open.ac.uk/ouhome-assets/images/ComputerSciencewithArtificialIntelligence.webp — 200 — 179.4 KiB — 34 ms — h2https://www.open.ac.uk/ouhome-assets/images/Psychology.webp/ouhome-assets/images/Psychology.we... https://www.open.ac.uk/ouhome-assets/images/Psychology.webp — 200 — 369.1 KiB — 64 ms — h2https://www.open.ac.uk/ouhome-assets/images/BA(Honours)Business%20Management.webp/ouhome-assets/images/BA(Honours)Bu... https://www.open.ac.uk/ouhome-assets/images/BA(Honours)Business%20Management.webp — 200 — 25.0 KiB — 47 ms — h2https://www.open.ac.uk/ouhome-assets/images/Business-meeting.webp/ouhome-assets/images/Business-meet... https://www.open.ac.uk/ouhome-assets/images/Business-meeting.webp — 200 — 52.0 KiB — 30 ms — h2https://www.open.ac.uk/ouhome-assets/images/People-on-shore-with-wind-turbines-at-sunset.webp/ouhome-assets/images/People-on-sho... https://www.open.ac.uk/ouhome-assets/images/People-on-shore-with-wind-turbines-at-sunset.webp — 200 — 86.4 KiB — 62 ms — h2https://static.cloudflareinsights.com/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da1771523124516static.cloudflareinsights.com/beaco... https://static.cloudflareinsights.com/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da1771523124516 — 200 — 10.7 KiB — 110 ms — h2https://www.googletagmanager.com/gtm.js?id=GTM-PPS2SH&gtg_health=1www.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-PPS2SH&gtg_health=1 — 200 — 392 B — 87 ms — h2https://www.open.ac.uk/analytics/?id=G-Z74G55VLY4&cx=c&gtm=4e64h1/analytics/?id=G-Z74G55VLY4&cx=c&gt... https://www.open.ac.uk/analytics/?id=G-Z74G55VLY4&cx=c&gtm=4e64h1 — 200 — 179.6 KiB — 70 ms — h2https://www.open.ac.uk/analytics/?id=G-43365CF947&cx=c&gtm=4e64h1/analytics/?id=G-43365CF947&cx=c&gt... https://www.open.ac.uk/analytics/?id=G-43365CF947&cx=c&gtm=4e64h1 — 200 — 161.9 KiB — 65 ms — h2
0 ms 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 1.6 s LCP 2.7 shttps://www.open.ac.uk// https://www.open.ac.uk/ — 200 — 83.2 KiB — 139 ms — h2https://de.cdn-v3.conductrics.com/ac-LXFBNkXiNm/v3/agent-api/js/f-dWyHnIAdDA/dt-EzQ29xSsSbrFdEypQszyo9LrPicxDP?apikey=api-Yj4rznDbbdMSfZflSxhm7BLtxYde.cdn-v3.conductrics.com/ac-LXFBNk... https://de.cdn-v3.conductrics.com/ac-LXFBNkXiNm/v3/agent-api/js/f-dWyHnIAdDA/dt-EzQ29xSsSbrFdEypQszyo9LrPicxDP?apikey=api-Yj4rznDbbdMSfZflSxhm7BLtxY — 200 — 47.6 KiB — 532 ms — h2https://www.open.ac.uk/oudigital/v5/eep/js/vendor/jquery-3.5.1.min.js/oudigital/v5/eep/js/vendor/jquery-... https://www.open.ac.uk/oudigital/v5/eep/js/vendor/jquery-3.5.1.min.js — 200 — 30.3 KiB — 47 ms — h2https://www.open.ac.uk/oudigital/v5/eep/js/vendor/jquery.placeholder.js/oudigital/v5/eep/js/vendor/jquery.... https://www.open.ac.uk/oudigital/v5/eep/js/vendor/jquery.placeholder.js — 200 — 1.7 KiB — 27 ms — h2https://www.open.ac.uk/oudigital/v5/eep/js/vendor/jquery.smartresize.js/oudigital/v5/eep/js/vendor/jquery.... https://www.open.ac.uk/oudigital/v5/eep/js/vendor/jquery.smartresize.js — 200 — 484 B — 35 ms — h2https://www.open.ac.uk/oudigital/v5/eep/js/vendor/modernizr-3.6.0.min.js/oudigital/v5/eep/js/vendor/moderni... https://www.open.ac.uk/oudigital/v5/eep/js/vendor/modernizr-3.6.0.min.js — 200 — 6.9 KiB — 32 ms — h2https://www.open.ac.uk/oudigital/v5/eep/js/ou.eep.js/oudigital/v5/eep/js/ou.eep.js https://www.open.ac.uk/oudigital/v5/eep/js/ou.eep.js — 200 — 23.8 KiB — 50 ms — h2https://design-system.open.ac.uk/component-library/dist/v1.19.15/library.cssdesign-system.open.ac.uk/component-... https://design-system.open.ac.uk/component-library/dist/v1.19.15/library.css — 200 — 189.8 KiB — 227 ms — h2https://design-system.open.ac.uk/component-library/dist/v1.19.15/library.jsdesign-system.open.ac.uk/component-... https://design-system.open.ac.uk/component-library/dist/v1.19.15/library.js 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https://www.open.ac.uk/analytics/ddm/activity/src=11438607;type=ukcount;cat=hpg_h0;rcb=12;ord=3148209046758;npa=1;gdid=dY2E1Nz.dNGJjND.dNzQzZD;uaa=x86;uab=64;uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0;uamb=0;uam=;uap=macOS;uapv=10.15.7;uaw=0;pscdl=denied;frm=0;_tu=KFA;gtm=45c92e64h1v9138707320z86911419za20kzb6911419zd6911419xea;gcs=G100;gcd=13p3pPp2p5l1;dma_cps=-;dma=1;dc_fmt=8;tag_exp=0~115616986~115938466~115938468~117266401~117884344~118128922;epver=2;gap.gtb=2;~oref=https%3A%2F%2Fwww.open.ac.uk%2F? — 302 — 875 B — 44 ms — h2https://www.open.ac.uk/analytics/gs/ccm/collect?rcb=4&frm=0&ae=g&dl=https%3A%2F%2Fwww.open.ac.uk%2F&scrsrc=www.open.ac.uk&rnd=249604569.1776816156&navt=n&npa=1&ep.ads_data_redaction=0&did=dY2E1Nz%2CdNGJjND&gdid=dY2E1Nz.dNGJjND.dNzQzZD&_tu=KA&gtm=45892e64h1v9234709626z86911419za20kzb6911419zd6911419xea&gcs=G100&gcd=13p3p3p2p5l1&dma_cps=-&dma=1&tag_exp=0~115616986~115938466~115938468~117266401~117884344~118463262&apve=1&apvf=f&gap.gtb=2&apvc=0&tids=AW-1071443088&tid=AW-1071443088&tft=1776816156501&tfd=1858/analytics/gs/ccm/collect?rcb=4&frm... https://www.open.ac.uk/analytics/gs/ccm/collect?rcb=4&frm=0&ae=g&dl=https%3A%2F%2Fwww.open.ac.uk%2F&scrsrc=www.open.ac.uk&rnd=249604569.1776816156&navt=n&npa=1&ep.ads_data_redaction=0&did=dY2E1Nz%2CdNGJjND&gdid=dY2E1Nz.dNGJjND.dNzQzZD&_tu=KA&gtm=45892e64h1v9234709626z86911419za20kzb6911419zd6911419xea&gcs=G100&gcd=13p3p3p2p5l1&dma_cps=-&dma=1&tag_exp=0~115616986~115938466~115938468~117266401~117884344~118463262&apve=1&apvf=f&gap.gtb=2&apvc=0&tids=AW-1071443088&tid=AW-1071443088&tft=1776816156501&tfd=1858 — 200 — 385 B — 42 ms — h2https://ade.googlesyndication.com/ddm/activity/src=11438607;dc_pre=CIOV3f6TgJQDFbBo9ggd-yM4rg;type=ukcount;cat=hpg_h0;rcb=12;ord=3148209046758;npa=1;gdid=dY2E1Nz.dNGJjND.dNzQzZD;uaa=x86;uab=64;uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0;uamb=0;uam=;uap=macOS;uapv=10.15.7;uaw=0;pscdl=denied;frm=0;_tu=KFA;gtm=45c92e64h1v9138707320z86911419za20kzb6911419zd6911419xea;gcs=G100;gcd=13p3pPp2p5l1;dma_cps=-;dma=1;dc_fmt=8;tag_exp=0~115616986~115938466~115938468~117266401~117884344~118128922;epver=2;gap.gtb=2;~oref=https%3A%2F%2Fwww.open.ac.uk%2Fade.googlesyndication.com/ddm/activ... https://ade.googlesyndication.com/ddm/activity/src=11438607;dc_pre=CIOV3f6TgJQDFbBo9ggd-yM4rg;type=ukcount;cat=hpg_h0;rcb=12;ord=3148209046758;npa=1;gdid=dY2E1Nz.dNGJjND.dNzQzZD;uaa=x86;uab=64;uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0;uamb=0;uam=;uap=macOS;uapv=10.15.7;uaw=0;pscdl=denied;frm=0;_tu=KFA;gtm=45c92e64h1v9138707320z86911419za20kzb6911419zd6911419xea;gcs=G100;gcd=13p3pPp2p5l1;dma_cps=-;dma=1;dc_fmt=8;tag_exp=0~115616986~115938466~115938468~117266401~117884344~118128922;epver=2;gap.gtb=2;~oref=https%3A%2F%2Fwww.open.ac.uk%2F — 200 — 401 B — 98 ms — h2
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
31% of JavaScript execution is third-party
First-party Third-party 175ms · 29KB · £2/mo
Unattributable
Other
Optional
Execution 116ms
Transfer 0 KB
Monthly Cost £1/mo
cscript-cdn-irl.cassiecloud.com
Other
Optional
Execution 59ms
Transfer 29 KB
Monthly Cost £1/mo

How third-party costs are calculated

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