Hello,
After exploration, it seems to be related with sampling rate. Using Voicemeeter Banana, I got the Realtek ASIO working at 44.1 kHz sampling rate, but not at 48 kHz. On Cubase, I’m unable to change the sampling rate, it is locked to 48 kHz on the interface (why?).
At this time, I’m using Voicemeeter Virtual ASIO as a bridge between Cubase and Realtek ASIO, it works fine, at 5-9 ms latency.