I've had this problem for the last week or so, every 4 seconds my PC will lag for a millisecond, its very strange and hard to explain! I don't have this problem in any other game or in Windows either.

I have done a fresh format, tried a different HDD, reinstalled XIV, tried different GFX drivers etc.

I really don't know what the issue is and I'm out of options on what to do next.

Win7 x64
ATI 5850 (latest drivers)
6GB DDR3
7200 HDD

Making a video now, to try and show the problem.

I can't see anything unusual happening in task manager either. @@!