Slow resource and third-party script monitoring

Resource details times every image, script, stylesheet and font that real users download, and shows which files and third parties add the most load time across all visits.

Resource details static resource timing

“Which images, scripts and third parties drag pages down?”

Sample data
Last 24 hours
All platforms
All events
Median

Total requests: 3.12M
Median load: 285 ms
P90 load: 1,851 ms
Cumulative load: 939M ms·req; headline

Images carry 92% of cumulative load
hero_banner_03.png P90 5,570 ms: slowest tracked
promo_tile.png = 5% of requests

Resources

10 tracked

/media/banners/promo_tile.png23.8%

162K req · 156 ms median · 982 ms P90
/static/chunks/app-4c6d.js10.7%

73K req · 291 ms median · 707 ms P90
/media/banners/hero_banner_06.png8.6%

59K req · 2,970 ms median · 5,430 ms P90
/media/banners/hero_banner_05.png8.2%

56K req · 3,027 ms median · 5,474 ms P90
/media/banners/hero_banner_03.png7.1%

49K req · 3,150 ms median · 5,570 ms P90

Connection-phase breakdown

median · 285 ms

ResponseWait / render

DNS 27 ms
Connect 19 ms
SSL 11 ms
Response 85 ms
Wait / render 143 ms

Where cumulative load concentrates

share of tracked load

Images 92%

Images · 92%
Scripts · 6%
Other · 2%

Images account for 92% of cumulative load, so they are the clearest place to optimise.

Sample data on example domains (shop.example.com). Your dashboard shows your own sites and apps.

What you can see on Resource details

Load time per resource type
Cumulative load: what costs most overall
Third-party scripts ranked by cost
The largest and slowest files

Questions about Resource details

What is cumulative load?

The total time a resource adds across every visit. A small file loaded on every page can cost more than one slow file on one page.

Are third-party scripts included?

Yes. They are listed by domain, so you can see what each vendor costs.

Last updated 6 Nov 2026 · Reviewed by [Name], [Role]

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