So I finally got the game to work on ultra, disabling ubersampling, removing 3d vision, and installing driver 275.27

My specs:

q6600 2.4ghz oced @ 2.8ghz
6gb ram
Geforce GTX 560ti

My issue:
When I start the game everything seems to work just fine (55-60fps in ultra). Sound is fine, cutscenes are fine, no matter what is happening on the screen. However as I keep playing the game, the cutscenes start have issues. Sound and animation becomes choppy. Everything seems to be slowed down as well. When the cutscene ends the game reverts back to 55-60fps that I usually get.

I updated my sound drivers just in case this was a sound issue and that still didn't fix anything

Just to be sure I restarted the game game right before the cutscene and it played it just fine.

I've done this multiple times. The longer the i play the cutscenes start to get worst and worst. This even happen during the instant kill animation that geralt does when an enemy is stunned.

I've tried da2 and crysis 2 and I haven't had any issues.

I've checked my cpu temps, 61c~68c, while playing the game. I've been informed these are typical temps for a core 2 quad processor (they generally run hot) so it can't be the issue.

Does anyone know why this might be happening?

Update: Still happening

I've tried and played multiple games, even pc flame bursting games like mafia 2 with physics on high and metro 2033. I played each for 2 hours and no issues occured. No odd choppy audio and slow flamerate in either game

Why is this happening to witcher 2???

If i restart the game the same cutscenes that were giving me trouble now work, but after 30-45 minutes of play, the game's cutscenes start freaking out. Again only the cutscenes have issues, not the actual gameplay. Argh!!!!!!

I'm having the same problem. Sound is fine for me but the framerate dives from ~30 to single digits during any cuscene. The strange thing is that the same cutscenes will work perfectly until I've been playing for 30 minutes or so. Restarting the game corrects it.

GTX570 using driver 275.27
X6800 Core 2 Duo @ 2.93 GHz
8GB RAM
Windows 7 64

It bears mentioning that I didn't see this problem at all until today. The only thing I changed is a few video settings: I enabled SSAO and disabled bloom.

Otherwise, I'm running maxed except for ubersampling and antialiasing, and I also disabled DOF during gameplay. Performance is consistently good except for the cutscenes.

edit: SSAO doesn't appear to be related. I disabled it but the cutscene slowdown still shows up after ~20 minutes.

I have the exact same issue I want this fixed it's really f'n up my gameplay

For me, only solution for this problem was to revert on 270.61 WHQL driver.
With that driver only some movies were bugged like that, but gameplay with NPC interactions and cutscenes was fine.

I disabled Cinematic DoF and it solved the problem for me.

OK, I will try this, but this setting itself shouldn't be causing the problem, because the cutscenes are running well for the first 30 minutes.
So even if it is a workaround, it's still no real solution because my GTX 460 is fast enough to render the Cinematic DoF and usually it should be fast enough after 30 minutes of playing, too.

Doesn't make it better, unfortunately :(

Well Cinematic DoF used to work well for my GTX 460 768MB too. The drastic slowdown during cutscene happened to me after patching the game. I played with a few settings, I turned off V-Sync and Cinematic DoF and the cutscene fps went back to normal.