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#11
I'd test fly it with just Avast and Malware Bytes enabled.
See if snappiness improves.
You have a Celeron 2.80 with 1 gig of RAM. It isn't going to rock the world regardless of what you do.
Also: look at task manager/processes; how many processes do you typically have running?
40? 90?
Be sure to check "show processes from all users" in that tab.