Cool idea, but without longer-term tracking of how long each browser lags for each Chromium release, it's hard to draw any meaningful conclusions. It's also clear that in the case of major vulnerabilities, vendors would fast-track adoption of the patch.

I would definitely include the fact that "major" versions of Chromium are released every 2 weeks. For instance, Vivaldi is on version 146.0.7680.218 that released this Tuesday [1], only 5 days ago.

[1] https://chromium.googlesource.com/chromium/src/+/f97d14f8a0a...