As a reminder, noticeable loss of throughput occurs only when there are a lot of concurrent flows (>16, on my connection).

To my knowledge and testing, ingress mode has been behaving like this from the beginning.

I'm using the old cobalt branch with the version after ingress mode was implemented.

tc-cake is configured with ingress mode and bandwidth 18800Kbit.

Downloading from a server with 2x16 connections using two aria2c processes, ~35ms ping latency to the server, I get about 18.7 Mbit/s received bytes on the interface (/proc/net/dev).

The remaining gross download rate is about 17.3 Mbit/s. That also matches the qdisc stats (drops/pkts = roughly 8%).