Page: https://shop.acme-widgets.example/
First party: acme-widgets.example
HAR source: WebPageTest example
| Metric | Value |
|---|---|
| Third-party origins | 10 |
| Third-party requests | 13 of 18 |
| Third-party transfer | 415.5 KB (67.5% of page weight) |
| Page weight | 615.5 KB |
| Worst offender | YouTube Images (impact 91.9) |
| # | Origin | Category | Reqs | Transfer | Main-thread est.* | Early | Impact | Action |
|---|---|---|---|---|---|---|---|---|
| 1 | YouTube Images ytimg.com |
Video | 2 | 125.4 KB | 498 ms | 46% | 91.9 | facade |
| 2 | Intercom intercom.io |
Support | 1 | 68.6 KB | 308 ms | 31% | 52.9 | facade |
| 3 | Google DoubleClick doubleclick.net |
Ads | 1 | 43.2 KB | 190 ms | 88% | 46.2 | remove |
| 4 | Google Tag Manager googletagmanager.com |
Tag Manager | 1 | 39.3 KB | 173 ms | 91% | 44.2 | defer |
| 5 | Google Fonts gstatic.com |
Fonts | 2 | 44.3 KB | 0 ms | 78% | 39.1 | self-host |
| 6 | Google Analytics google-analytics.com |
Analytics | 2 | 18.9 KB | 72 ms | 82% | 37.6 | remove |
| 7 | Stripe.js stripe.com |
Payments | 1 | 29.5 KB | 132 ms | 73% | 36.0 | defer |
| 8 | Hotjar hotjar.com |
Analytics | 1 | 21.7 KB | 97 ms | 65% | 30.2 | remove |
| 9 | YouTube youtube.com |
Video | 1 | 23.7 KB | 0 ms | 54% | 22.2 | facade |
| 10 | Google Fonts googleapis.com |
Fonts | 1 | 880 B | 0 ms | 90% | 21.2 | self-host |
* Main-thread est. is a heuristic (executable JS bytes x ms-per-KB); HAR has no CPU data.
Heavy video embed. Replace with a click-to-load facade (static placeholder that loads the real embed on interaction) so its weight and main-thread cost are paid only when a user engages.
Estimated saving: ~112.9 KB / ~448 ms
Heavy support embed. Replace with a click-to-load facade (static placeholder that loads the real embed on interaction) so its weight and main-thread cost are paid only when a user engages.
Estimated saving: ~61.7 KB / ~277 ms
Ads script with no first-party rendering dependency. Removing (or replacing with a lighter, server-side or consent-gated alternative) reclaims all of its cost.
Estimated saving: ~43.2 KB / ~380 ms
Also: Until removed, load it with async/defer.
Script loads early (earliness 91%) with an estimated 173 ms of main-thread work. Add async/defer or load it after first paint to unblock rendering.
Estimated saving: ~120 ms
Fonts on a separate origin adds a DNS+TCP+TLS handshake. Self-host the asset (or, at minimum, add a preconnect) to remove the extra connection and gain caching/versioning control.
Estimated saving: ~150 ms
Also: Used early — preconnect gives an immediate win before self-hosting.
Analytics script with no first-party rendering dependency. Removing (or replacing with a lighter, server-side or consent-gated alternative) reclaims all of its cost.
Estimated saving: ~18.9 KB / ~207 ms
Also: Until removed, load it with async/defer.
Script loads early (earliness 73%) with an estimated 132 ms of main-thread work. Add async/defer or load it after first paint to unblock rendering.
Estimated saving: ~95 ms
Analytics script with no first-party rendering dependency. Removing (or replacing with a lighter, server-side or consent-gated alternative) reclaims all of its cost.
Estimated saving: ~21.7 KB / ~207 ms
Also: Until removed, load it with async/defer.
Heavy video embed. Replace with a click-to-load facade (static placeholder that loads the real embed on interaction) so its weight and main-thread cost are paid only when a user engages.
Estimated saving: ~21.3 KB
Also: Also add preconnect for the moment the facade activates.
Fonts on a separate origin adds a DNS+TCP+TLS handshake. Self-host the asset (or, at minimum, add a preconnect) to remove the extra connection and gain caching/versioning control.
Estimated saving: ~150 ms
Also: Used early — preconnect gives an immediate win before self-hosting.
Impact is a 0–100 weighted blend, normalised against the worst third party on this page:
impact = 100 * ( 0.35*bytes + 0.35*mainThreadEst + 0.15*requests + 0.15*earliness )
See the project README for the full formula and caveats.
- Third-party resource impact mapping
- Replacing third-party embeds with facades
- Measuring tag-manager blocking time
- Strategic preconnect / dns-prefetch usage
Generated by third-party-impact-mapper — audit guidance at network-priority.com