Can you tell me the exact version of OS X you are currently running, please?
Click the Apple logo in the menu bar at the top left of the screen
Select "About This Mac"
In the window that opens, look for the "Version" information. Please let me know what it says.
actually, when you get home if you could do the following that would be great...
please download and run the following tool.
It will collect information about your system for diagnostic purposes.
Run the app once it has downloaded
On the first screen, leave all options checked and click “Start EtreCheck”.
When it is finished collecting data, click “Share Report” and choose "Copy report to clipboard"
Then click “I Accept” and paste it back to me as a reply. (You should be able to paste it back by right-clicking or Ctrl-clicking where you type your reply to me and then choosing Paste from the pop-up menu).
Ok thanks. Once I get the report back, I'll look it over and we can go from there.
Apologies, I've caught a bug going around and have been under the weather.
Your report doesn't look bad. I might recommend a few things though.
First, I recommend removing your Symantec software and see if system response improves. This may be part of what is causing a lag for you.
Next, I would also recommend upgrading to OS X 10.11 "El Capitan". The version you have installed does tend to get sluggish in low memory situations. "El Capitan" can be downloaded and installed from the Mac App Store.
Thanks and good luck!
Let me know if you have any questions along the way.