Windows adding delay

Hi,
I got an audio application and have an issue :

On mac, no delay is present when on windows, it adds 75ms of delay when calling the audioIOdeviceCallback function, I’d like to know where the delay comes from ?

There is no ‘one size fits all’ answer to this - it depends heavily on how your Audio system is configured, what drivers you are using (vendor/ASIO/etc.) and how your hardware is set up … without more details about this, it is difficult to arrive at a satisfactory answer. What DAW are you using when you measure this? What drivers are in use in your test case? Tried with other DAWs?