Yep. There's a small delay and it totally ruins the watching experience. I heard some players like hulu will auto sync though. Don't take my word for it though since I don't use hulu.
I don't think it'll be impossible for them to fix it though since fiio got it right for the most part.
But here is huge different!!! Fiio have XMOS chip (with clock etc.) - it is HW based streaming to I2S over USB (like iBasso D7 and many other USB DACs). DX90 have not implemented any chip and clock for this. iBasso want make audio streming over standart USB communication. And it is big problem with synchronization and stability. It is impossible make bit perfect real time playing. And buffering data make sound delay.
One reason why I buy DX90 was USB DAC, but when I discover, that have no HW for this, I was little frustrated. Maybe iBasso will make drivers, what will be stable and with acceptable delay, but it is difficult.
It is reason, why I write in history, that I want DX90 V2 with Coax In instead Coax Out
It is very simple and with 100% compatibility for all devices without any drivers.