[Nezil]

What does all of this mean for performance though...

Comparing the logs from the >2.0 seconds shifts to the ~1.4 second shifts and the < 0.7 second shifts, the speed at which boost rises is quite different.

In the slow shift log, boost has fallen to zero, there is even a vacuum at the MAP sensor, but the waste gate closes fully and boost builds from 0 to meet the target in just 1.4 seconds. In the quicker shift log, the boost build is the same at 1.4 seconds, but boost wasn't at zero... it started from 3.3 psi; a slower boost build with a much faster shift. In the fastest shift log, boost crosses the target in 1.3 seconds, and in this case, boost had only dropped to 5.8 psi; a much higher starting point but basically the same duration for boost to build!