The sound problem is a known issue, it's cause they're not preloaded and the game has to dig through the HDD to find the appropriate wave sound.
I wasn't getting warping on dswp TDM before either, I've been having it frequently for the last month or so, since all the lagging started.
Simplest solution is to use Fateswarms optimized iourt exe. Which fixes a lot of issues including sound lag and lag you get when someone joins a team.