Very slow 2008 mac
Installed 4 gybes ram and upgraded to Yosemite 10.10 OS. System painfully slow and activity monitor usually slows almost all of the ram being used.However, adding up the applications running only accounts for half of the ram. What is using the other half and why dosen't it show? Tried reseting SMC which helped ram for a short time. Both internet and stand alone applications take way too long. Would appreciate any ideas. Thanks. John
iMac, Mac OS X (10.5.8)