Like others I was suffering from pain....fully slow auto anti-virus updates c.10mins that slowed all other programmes.
Yesterday I had/installed the auto programme update ZoneAlarm Security Suite 9.3.037.000.
Anti-virus update today just flew!
However yesterday I saw a user report that commended the registry cleaner R......a. Tried it for free. Astonished at the alleged number of errors compared with my usual registry cleaner. Installed the aforementioned cleaner and remedied errors.
So not sure which cured the slow update! If ZoneAlarm then many thanks.