Hi all, Before I installed Snow Leopard (SL) I had Leopard installed. It was working ok, just a little slow at times and apps would crash often. I figured a fresh install would be due since it had been close to 4 years since I got it. After installing SL I found out the hard drive was going bad so I installed a new Hitachi 500 GB 7200 drive. I installed this drive just last week (5 days ago) and installed SL fresh on the drive. Here are my observations so far: Good -Apps open much quicker and things seem to be "zippier" Bad -I seem to run out of RAM much more quickly. With nothing else open but Safari, after having a few tabs open my Free RAM goes to basically nothing. As of right now "Active" and "Wired" RAM take up almost 75% of my 2 gigs with only Safari open. In Leopard I only started running out of RAM if I had lots of apps open. The process "Flash Player (Safari internet plug-in)" is taking up 431 MB right now (seems to be large when visiting sites like ESPN). Is this a lot?? -My MS Basic optical mouse seems to have a sort of delay when scrolling. Its just noticeable enough to be an annoyance much of the time. It never did this in Leopard I haven't done much of anything since installation. Here are the only things I have done since the install -All updates are installed -MS Office '08 installed -No files transfered to the new drive yet -No additional dashboard widgets or anything -No other programs have been opened beside Office and Safari Given I haven't done much of anything so far, I don't know why it would be like this. I'm not sure why my mouse is doing that. Do I need more RAM? (The guy at the apple store said 2 gigs would be fine) Does this just have to do with new versions of software (ex. Safari) that I now have installed that take more resources? I kind of want to just revert back to Leopard, but I"m not sure even then that I'll be able to get back where I used to be. [UPDATE (10 min after post): I'm running live video hi res video feed with other apps open and it seems to be doing ok.] I am familiar with the different types "Free" "Active" "Inactive" "Wired". There was one time where it definitely ran slower after running out of Free RAM. I guess it's possible this could be a mental thing, knowing I'm out of Free RAM, ya know. Anything I might look to do? Thanks for the help.