High cpu usage during full antivirus scan

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BuddhikaSadun

I am using dell inspiron 155000 i7 laptop .I have a preinstalled Mcafee antivirus and usually do a full scan once a month.Recently i observed some problems in my pc they are;1.Full scan from Mcafee uses cpu upto 100% and speed over 3.00ghz consistently unlike previously cpu at 1ghz-2ghz(same usage for windows build in full virus scan)2. huge cpu spike upto 100% when opening program and comes to normal3. Some service host processors like NoNetworkFirewall,NetworkRestricted in ram that i havn't seen before4.a process called Microsoft compatibility telemetry uses more cpuPLEASE GIVE A

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