I've inadvertently tried this mode yesterday, even before the announcement was made, but found that something weird was going on:

- it eats tons and tons of CPU, like this is a common picture

6568 root 20 0 7357216 3.2g 20072 R 109.6 1.3 6:10.60 mitmweb

- lots of packets dropped, sometimes at a considerable rate

[14:38:33.501] Dropping incoming packet, TCP channel is full.

This isn't me running some http-hungry application, just immediately after the phone restart. I'm running mitmproxy 9.0.0 installed through pip on Linux with python 3.9.2. Unfortunately it's not easy for me to try any other mode - i've first tried setting up transparent proxy on MacOS, but ssl bindings crash on M1.