Since I upgraded to version iTunes (10.0.1), playback is bumpy and full of hiccups. Typically, for video playback the video will freeze for a second or two at random times, and then skip to the current location in time, meaning that content will be skipped over. This happens every time I play videos now, and it is seriously starting to annoy me.
For mp3 playback, sporadic hiccups seem to be happening as well, but with nowhere near the frequency of videos.
The videos I play are all content purchased from the iTunes store, typically TV shows in 'standard definition'.
I have (obviously) tried to close other resource-hungry apps etc, but that does not help. iTunes is typically at 5-15% processor usage when playing video.
I use Mac OS X 10.6.4 on a 2.53 Ghz Intel Core 2 Duo MacBook Pro with 4GB RAM. Hard drive has about 10 GB of free space.
Any ideas as to what is wrong here?