Originally Posted by alekhidell
I would like to be able to keep my computer clean from unwanted files, including all internet files,pics, and downloads. I use clear private data using mozilla, but does it clean up enough?
Private browsing mode on Firefox doen't store any history, or files in your disk, so it safe to say that it "cleans enough".
The exception is files that you manually download. You will have to remove them from your disk if you want. Although, removing downloaded files doesn't improve performance in any way. It just increases free space on your disk.
The title of your thread is "how to optimize my computer performance?
I recommend to you disabling unnecessary services, but only do when you are comfortable and experienced to know what services you need. When you do feel comfortable do a search on Google with: "disabling unnecessary services SUSE" or ask here if you are insure.