Flex Asio not working with Focusrite 4i4 4th Gen (buffer and latency issues)

[PeGeve]

So ive recently got a focusrite 4i4 gen 4 using windows 11 and I'm trying to use flex asio but it doesn't go low to 16 buffer size even though interface setting is on 16 buffer size. here's a screen shot

[dechamps]

I doubt a buffer size of 1 ms is ever going to work, regardless of driver or anything else. IMHO Windows thread scheduling is unlikely to be able to consistently hit 1 ms deadlines, unless you have an extremely fine-tuned system and know precisely what you're doing.

For information on how to optimize FlexASIO for latency, see this FAQ. Most notably, buffer sizes this low are pointless unless you change the backend to WASAPI Exclusive or WDM-KS, as the ASIO buffering period will be dwarfed by the Windows audio engine buffering period otherwise.