I've noticed lately that Quicktime seems to be having performance issues. There are some videos that used to play perfectly well in Quicktime, and now they stutter and drop frames all over the place. VLC plays the files just fine, but Quicktime chokes on them. Most the the files I've noticed this with have been higher bitrate MPEG-4 encoded files. Activity monitor shows CPU usage as 100%. WHen I play the same file in VLC it uses 60-70% cpu. Am I alone in this or has anyone else noticed this too?