Hold Up Time
Thanks to the good design, the hold-up time is long since the bulk cap is not that large compared to other high-capacity PSUs.
The inrush current is on the high side with 115V and low with 230V. The same went down with the 1000W model.
The PSU supports Alternative Low Power Modes. The Power-on time (T1) should be below 100ms, ideally. Again, this was the case in the 1000W model.