I am using Winamp, which I have used since version 2.x, to play .mp3 format music.
Prior to formatting, I used avast and didn't seem to have this problem.
But the weird thing is that it only seems to happen when I have, for example, the actual firefox download manager open on top.
I can tell that it is not the music player's fault, because the mouse lags and moves slowly during the temporary slowdown/hang.
Any help would be greatly appreciated.