First time ever had an iMac slow down and act like a virus or malware was in it. I found Flux Computer Repair online, saw that they had a 5-star ranking on Yelp and called them. They have an app you download which is used to access your computer, wherever you are.
Jason was really fast in solving my problem. It was the Avast Anti-Virus s/w VPN that was clogging this machine down. Now it's zippadeedoodah again!
Highly recommend, he remotely fixes PCs, too.