it happen when click filearchive(left column) list after add all track to waitlist.
but if remove all song from waitlist(righ column) and click filearchive(left column) list is not any problem, one thing difference is color of file archive list (middle column), if is black is ok scroll smooth but if orange is freezing. after remove song list form waitlist and then filearchive list(middle column) will turn to black and smooth click.