I'm a puter-moron (thus I migrated to Mac from PC). Though I've been using my MacBook for over 2 yrs I'm pretty much a newbie. I've been only using the most basic of the basic functions on the mac - never had time to learn meself much. Anyhow my macbook is slowing down quite a bit for the last few days; I notice the rainbow spining loading symbol thingy quite a bit here and there but, e.g. when I'm in the Bookmark Manager there is significant slow down especially moving folders around (I do have massive amount of bookmarks/folders... I didn't think bookmarks draw on the system much). I have some guess as to what might be causing the bog down but not precisely sure what though (or could be "all of the above"). I've been doing a few things that I haven't/don't usually do as I have more time lately to tutor myself and try things out. So here is what I have and what might be few possible causes: 2008 Black MacBook 2.2 GHz Intel Core 2 duo w/ 4 GB 667 MHz DDR2 SDRAM and I run Safari, Firefox and Chrome all at the same time. 1. I've been downloading large video files right to the macbook's HD (I do have a 500GB 2.0 USB External HD but I haven't quite figured out how to do it precisely yet... I dabbled at trying to DL a 0.5 GB file but seemed to take forever...): according to iStat 82GB used and 67GB free. I believe there is approx 25~30GB increase in the last couple weeks. (Btw I have another External HD for Time Machine: 90GB used 60GB free) 2. I've been increasingly leaving more and more TextEdit files open... perhaps 20+. I usually leave only a few open. 3. I use Expose - 9 spaces and generally have at least 8 browser windows+ open. Lately I've been leaving more browser windows open like 15+ but backing down to keeping 8 browser windows open didn't really help. I have feeling its the sudden mass of vid files on the HD but I'm not sure how much is too much. I suppose I could eventually figure out by saving the vid files etc to Ext HD etc but I'd really appreciate any pointers and suggestions. Thanks much.