Nice, yeah we had one customer using Cloud Build, and in their case their native amd64 builds dropped from around 12 minutes to 1-2 minutes on Depot builders. Surprisingly to us, it was even faster to push from Depot to Artifact Registry than from Cloud Build directly, definitely an odd networking quirk.

arm64 builds should even be a more dramatic change, they should drop to at least as fast as your current amd64 builds.