Imac is a little over 1 1/2 years old but has slowed down on boot up and when loading some apps. Also have trouble when going to find the wifi connection. It takes about 5 minutes to find the Verizon MiFi even though the MiFi lights up immediately. There are about 15 different wifi connections possible, all secure, that pop up immediately, my particular wifi connection takes a long time to be located. Page loads are slow even though it is a 4G connection. Also, any input on "Cleanmymac" software?