If your Mac is running slow There are a variety of ways to address the issue. To check for memory issues First, open Activity Monitor. Choose the process you're experiencing and then press to quit. If the process is taking up too much memory, you can close it and restart it later. Alternately, you could utilize the System Memory tab to check whether there are other slow processes that are running on your Mac.
A CPU issue is another cause of slow performance on your Mac. Close any program which speed my mac uses too much CPU. In the Activity Monitor and click the "X" button beneath the buttons. If you're not certain what apps are consuming too much CPU power Try doing a Google search on these apps. It should provide you with some idea which applications are causing your Mac to be slow.
In the event that your HDD has been overloaded the drive can also trigger your Mac to slow down. Operating systems will be slower if you have several programs. Make sure to delete any files you don't use or move them to a different drive. If you're not sure what's causing the problem You can try opening up the Activity Monitor and looking at the entire list of processes that are operating in your Mac. Some errors will be visible - it is an indication that your computer has too many running all at the same time.