Yes. The same inventory answers both questions: what does each script cost the page, and what could it do. Web.dev notes third party scripts can slow a site, cause privacy or security issues and behave unpredictably, so one list with a few columns lets marketing and security decide together.
Why combine them
Web.dev's guide on third party JavaScript says that if you have optimized your own code and the site is still slow, third party scripts are probably the cause. It lists risks: slowing performance, privacy or security issues, and unpredictable behavior. A script that loads late, blocks rendering or pulls in a chain of other scripts is a performance problem and a trust problem at once.
Marketing teams care about speed because it affects conversion. Security teams care about reach. A combined audit gives each side a reason to prune.
The audit table
| Column | Question |
|---|---|
| Script and host | Who serves it? |
| Owner and purpose | Who asked for it and why? |
| Load cost | How many requests and how much main thread time? |
| Blocking behavior | Does it delay rendering or onload? |
| Data reach | Which pages, forms and cookies can it see? |
| Chain | What other scripts does it load? |
| Alternatives | Template, server side event, lazy load or removal? |
Steps
- List scripts. Use the inventory method.
- Measure cost. Web.dev recommends free tools such as Chrome DevTools, PageSpeed Insights and WebPageTest to identify costly third party scripts. Record request counts and blocking time per script.
- Mark data reach. Flag scripts on pages with forms, logins or payments.
- Score each one. High cost and low value goes first. High reach and unclear owner goes next.
- Choose an action. Remove, replace with a template, load after interaction, move server side, or keep with review.
- Record the decision and a date to revisit.
Quick wins that help both
Remove tags nobody can justify. Remove duplicates, such as two analytics tools measuring the same thing. Narrow triggers so a tag runs only on pages that need it. Lazy load widgets such as chat or video until the visitor interacts, which cuts early load and early exposure. Self host static libraries where the vendor allows it, and pin versions. The trade offs are in self host or CDN for third party JavaScript.
Try it yourself
Click through it at your own pace, or open it full screen. The idea of ranking by what can actually be reached carries over to scripts: put data reach next to load cost.
A note on measurement
Test on realistic devices and networks, not only a fast office connection. Repeat after each release, since a vendor can change its script without telling you. Detecting when a third party script changes covers that.
Quick check
Which tags should go first?
Those with no owner or purpose, then duplicates, then high cost and high reach scripts.
Does lazy loading reduce risk?
It reduces exposure on first load and speeds the page, but the script still has full access once it runs.
Where Safeguard fits
Safeguard's dependency scanning and SBOM cover packages you bundle, and its free scan gives a quick look at a repository: gold.safeguard.sh/scan.
Sources
Last reviewed: 19 October 2026.
