I sometimes think about installing a newer version of OS X than 10.6 but it seems even Windows 7 runs faster on a Mac than OS X at times. My sister has a Core i5 MacBook Pro 13" from 2012 and it runs deplorably slow on Yosemite 10.10. I have a Core 2 Duo Macbook Pro 13" from 2010 running 10.6 and it still runs really fast for everyday tasks like loading the web browser or using basic applications. When she tries to open the web browser the icon bounces up and down for centuries. I don't know. It's probably obvious. But are newer versions of OS X much more resource intensive? Is Apple not keeping computer resource use in check on purpose because they want you to buy a new Mac and one with an SSD? 10.6 works just fine and fast off a traditional HDD.