Can anyone remember what was the engine used in Warhammer Online? I had the same, sometimes severe, hitching issues that I have in SWTOR. Oddly enough, at the time, running the game in highest-quality textures (with everything else cranked way down) improved the hitching a lot.
Agree on disk-bound, I can hear the poor thing working its little heart out when Im in game.
On the other hand I am really curious how it is possible to even run the game if there are essential DX9 files missing.. Downloading that redist to install and see if makes a difference.