I have a late 2008 MacBook with 4gb of RAM. It is currently running Snow Leopard. I want to upgrade, but my main concerns are that I can still use Adobe CS5 design suite without too much problems, and also that I don't slow everything down by upgrading too far for my old faithful laptop to handle. I don't really care about lots of new bells and whistles, I just want to continue to use these programs as I can't afford an Adobe subscription or to buy a new computer yet. I have searched all over for advice and it seems so hit or miss whether I will have problems with various upgrades or not. Many have said Mountain Lion is generally better than Lion, but according to RoaringApps that is the only OSX with issues with CS5. It doesn't say what the issues are - if I'm wrong and there is some way to learn more on that site please let me know. Also I am wary of trying Yosemite as it's only been out a short while and I am always the cautious type to wait for the major bugs to become apparent before deciding, plus since my laptop is so old I worry it could slow it down. Any help appreciated!