K-5 video and Lightroom 4

OK...for those of you using the K-5 with Lightroom4...have you noticed any issues with your video files?

When I try to watch videos in LR4 they are sooooo sloooowww. Playback is very choppy...and there is no audio. When I watch the movie in windows there is audio...but not in LR4.

I've got a dual core system with 4GB of RAM...LR processes my images fine...but it's choking on video.

Is this just me or are others having problems?