My imac is getting slower and slower and has probems connecting to internet. Any idea on how to restore initial performance? thanks

my imac is getting slower and slower and has probems connecting to internet. Any idea on how to restore initial performance? thanks

What year, screen size, CPU speed and amount of RAM installed?
What version of OS X is your iMac running?
How full is your Mac's hard drive?
How many applications do you run simultaneously in the background while working in another application?
Do you run any antivirus software on your Mac? Antivirus software can slow down the normal operation of OS X.
Do you run any "crapware" like Mackeeper or any other type of so called hard drive "cleaning" apps?

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