Hello. First of all, sorry for my english if you will see any mistakes. I have a second notebook at home, it’s MacBook Pro 13 (mid 2010). I want to make it like my second note book for some small works. Now the computer slows down wildly. It can hang on the enter window for 3-4 minutes, or when I work on a simple document in Word or Excel, and other slowdowns. The question is - what can you advise to make it work good? Or what is the problem? - First of all I want to completely delete all information and reinstall like a new one. Will it help? - Second - it makes sense to put the old OS? Now there is 10.9.2 (Mavericks). Should i install Captain, or vice versa fall back to Lion? How will the program work on Lion? - Can the RAM upgrade to 8Gb help? Or place SSD instead of CD-drive? Other options? - I am ready to listen to any good advice and recommendations. Thanks!