Boot Slowed Down Cannot Find Cause

After log on for roughly 3 minutes or so the PC load times for most things are quite slower than usual. I can hear the HDD spinning being read and written to i presume.Under task manager processes tab (inc all users) the main culprits for CPU usage are a few svchost.exe (mainly PID 948 which includes windows audio endpoint builder, which is also the one that uses the most memory)After i stop hearing the HDD work which is usually when the processes stop jumping around the PC speed ups dramatically and to the speed that it should be.This happened gradually as the PC got older etc more programs installed.But this is my confusion, i have NO crap if you like on here just needed programs like office, Norton 360, Itunes, a few games and few others random things.I watch carefully what i download and scan the whole system every now and then with Norton 360, spybot S&D and malwarebytes. There is usually nothing there.I use Ccleaner and clear up everything once a month and also clean the registry.My msconfig.exe boot settings are cut down to barely anything, about 8 things max including my catalyst control centre. The non microsoft services are all enabled currently there is only 9 all kind of essential to me.

One thing that does effect this is if i do not enter password straight away on boot and leave for few minutes it shaves the startup time down alot which doesnt that point to microsoft services only?I do not overclock, temperatures are always fine too and all windows updates are installed.