Hello,
I have a 2007 iMac AL (20" 2.4GHz, 6GB Ram, 2TB hard drive) running Yosemite (current on updates). I wiped the iMac clean late last summer (ca. July 2015) and rebuilt it with Yosemite (was on Snow Leopard). To my knowledge there are no apps on it that are heavy web users (apart from...