Is PYNQ using PCAP interface to configure the FPGA?


I’m trying to understand how Pynq libraries configure the FPGA, but I have not found anything in the documentation.
With Pynq 3.0.1 on a KRIA KV260, the time taken only to fully reconfigure (removing all the other controls and stuff) the FPGA is around 150ms for a bitstream of 7.8MB. However, the bandwidth of the PCAP should be 145MB/s, which is not in line with the time I’m seeing.

Am I missing some overhead? Are there ways to achieve better reconfiguration time?