[3np]

Transaction / bit-second. The unit is normalized for bit-seconds to adjust for the fact that even with the same aggregate size, a single large transaction is different to a large number of small operations.

It was only when GCS reached 1.0 Tpbs that we started shifting workloads over.

However, these benchmarks are only relevant within the same region. As you move further away, roundtrips and speed-of-light will become significant enough that I've seen some people do benchmarks in Tpbms.