I was advised recently that a software called MacKeeper was not an authorised protection program and to remove it. I have done so. What do I need to keep my iMac protected but also efficient?

Can anyone help with my question above

Most anti-virus solutions can slow down your Mac, but to be honest, the best anit-virus is you, the user and your brain.
Don't visit questionable websites or website you are unsure about.
Don't install pirated software or software downloaded from questionable or unknown websites or sources.
Java is a vulnerability right now, if you do not need it, don't use it.
Use a browser filter and pop-up blocker
Don't open email attachments from email addresses that you do not recognize.
Install security updates when they become available
Educate yourself as to what threats are common and active.
In effect, use your brain as an antivirus filter.
Follw that advise and in MOST cases, you will be fine and won't feel the need to have to install antivirus software.

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