A friend of mine has a 2012 Macbook Pro 2012 non retina which is running Yosemite. The specs are as follows: Processor: 2.5GHz Dual Core Intel Core i5 RAM: 4GB 1600MHz DDR3 SDRAM Hard Drive: 500GB Serial ATA Drive @ 5400 rpm Graphics: Intel HD Graphics 4000 So the computer is running really slow. It's not for any specific task, it's just running slow the whole time. Someone suggested that she should upgrade the RAM as Yosemite likes at least 8GB of ram to run smoothly but I wanted to check with you guys whether she should do that as she doesn't want to pay money for nothing. If the RAM is the problem, any idea of a place where she can buy some RAM that will work at a good price? Cheers!