Is there a program that will check for viruses or other reasons why it runs slow?

For several months my iMac has been running slow or freezing often. Safari often quits unexpectedly as does mail on occasion.

Programs that check for viruses are a major cause of slow Macs, so let's look at doing steps that don't handicap your computer:
1) How full is your hard drive? You need a minimum of 10G free for background processes such as Virtual Memory.
2) How much RAM is installed? RAM for the Mid-2010s is rather cheap at the moment, I upgraded my 27-inch Mid-2010 recently from the original 4GB to 12 GB for about US$55. Installation took only minutes.
3) If you have an external hard drive for backups, are you using something other than Time Machine to do the backups. Many third-party backup programs can cause a performance hit.
The next step is a little longer. It checks to see if some runaway background process is eating processor cycles and slowing you down:
1) Use your computer normally for typical tasks for several hours, then quit any applications you have launched. Do not restart.
2) In Applications > Utilities, find Activity Monitor. If you've not used it before, you have to change a setting. At the top of the AM window is a "Show" option. By default it is set to show "My Processes." Change it to "All Processes" like this:
4) Now highlight the "%CPU"column as shown so the most active processes "bubble"to the top (tiny arrow points down).
Now watch things move up and down for a minute of two. What you are looking for is any single process that is using more than about 10 percent of the processor cycles while the computer is idling. If you see one doing that, post its name in a reply here.
Awaiting your report,
Allan

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