Hey guys. Back from 3 Months holyday

I was deeply disapointed when starting cod with new patch yesterday.
Stutering like never before

I searched a litle bit in the forum and found the solution
with microsoft .NET Framework 4 and directx,
which made me happy again

But ive got a bug, or at least i think its one, when diving.
The cool sound when fast diving is not here anymore

Does anybody share this problem? Solution?
Cheers