3rd-party blocking · Blocking by others
Third-party blocking: the part of long frames spent running other domains' scripts.
3rd-party blocking verdict
v1.2.2 vs v1.2.1 · / · mobileUnchanged
Blocking by others didn’t change. A change only counts when it is at least 5% and at least 30ms. Here that means 30ms, so this one doesn’t.
Now · v1.2.2
83ms
Visits measured
231
on mobile, enough for a verdict
Moved in the same release
The rest of third-party cost. A place to look, not a cause.
Top third-party domains
Ranked by how long their scripts block across visits · Mobile
| Domain | Visits | Size p75 | Blocking p75 |
|---|---|---|---|
| googletagmanager.com | 485 · 92% | 118 kB | 64ms |
| facebook.net | 343 · 65% | 92 kB | 38ms |
“New” means the previous release never reported it. Only domains are collected, never full addresses, and your own subdomains count as yours. A dash means none seen. Browsers only share a file’s size when its server allows it (the Timing-Allow-Origin header). Google, Facebook and most public CDNs do, but some chat and ad vendors don’t, so sizes are a lower bound.