My 2012 MacBook Pro 15", OS X 10.9.5, 2.6 GHz i7, 16 GB RAM, 750 GB HDD, has been acting very slow recently. Starting up takes a long time, not only for the login screen to show (if starting up from being turned off), but once logged in it takes about 10-15 mins to become responsive to the point were the Finder or any of the programs are responsive enough to be used.
Then during normal use the machine can be running fine, but flicking between finder windows, quick previewing an image in the finder using space bar, move files can cause it to hang when ill then have to wait, or force reboot the finder, using force quit. Generally though everything seems quite lethargic.
The first thing I did was to check Activity Monitor, where as far as I can tell the Mac has got more that plenty of resources available (see below screenshots.) Although these are obviously taken at a set point in time they are pretty indicative of whats normally shown in the activity monitor.
I've checked to see if the machine's indexing, which it isn't. I've also noticed that the when I first open the machine, Dropbox is starting up which seems to make everything quite slow, but I don't believe it's the only culprit.
I suppose I could upgrade to an SSD, but dont particularly want to as they are quite expensive for 750GB and the machine as far as I can remember wasn't always this slow and I've always been running the same tasks on it.
Is there anything else that I might have missed in trying to troubleshoot and resolve these issues?