The couple of weeks I've noticed my iMac7,1 OsX 10.6.7 not performing as it usually does? Examples are browser windows in Firefox and Chrome popping up almost 10secs from the dock on launch and system very slow to sleep, taking almost 10secs even after I quit all applications? I've done permissions repairs and cache/task cleans with "Maintenance" app, turned off all apps and airport but can't figure out what might be causing it? Do you think it's a hardware thing or software? Thanks in advance.