hello forum my macbook has been lagging like crazy for the last week or so, its weird because it started out of nowhere. Basically anything i do, regardless of what program im using, will eventually bring up the beach ball. When i watch videos, the screen will freeze, with the audio still playing, and then jump forward to wherever the video has progresssed. This happens every 20-30 seconds, with it getting better/worse with no apparent reason. Ive read up on a lot of similiar posts and have repaired disk permissions, checked my CPU activity and found nothing abnormal, and i did a disk repair using the install disc (disk utility found that my HD needed a repair, after the repair, all checks have shown my HD is fine now). What are my next options? I dont really want to take it to the apple store if this is something i can figure out on my own. And i dont want to go out and replace the HD only to find the problem still there.. Could anyone please help me out? Thanks for reading such a long post.