Lossless cut (preview) lag?

[carlxw]

Hi, I'm experiencing really slow (off-sync audio, frames catching up and then slowing down) preview in lossless cut. I have no idea how to fix this.

Sorry if this was already mentioned, or sorry if I should be posting this under the issues tab. I'm just a student who don't know the ways of GitHub

e: Never mind, seems like the problem was not the software. A clean install of GPU drivers fixed it