I'm also having some problems with Premiere Pro. Importing a project would make RAM usage go to 96% (I have 16GB RAM) and after a while it would drop to around 4GB Usage. (I assume it finished loading). But making edits and playing playback is very laggy and sluggish. All I've done to the video is cuts and video transitions. No filters or effects yet.
Sometimes Premiere Pro would also crash, the application would go unresponsive totally, and I would have to kill the tasks and restart the project. A pain since some of my edits have not been saved quite a few times. Anyone knows the reason?