cpu has been more than 50%

I use the fedora system
boot each time, CPU is always above 50%, never less than, and often reached 100%

1.poisoning may be, antivirus
2.clearing systems, patching is in all likelihood the virus may be, of course,
system
not heard of such a system, not Know the system is not a procedure had never heard of this system, ah! Boot is a dozen general.'s Top floor, 2 buddies, as you have so many words about the closure of the anti-virus software, let him upgrade to close the firewall to uninstall them all the best, so what are you are low, and even the computer you have the safety factor Reduced, the more powerful antivirus engine, but take up much more resources, particularly in the auto-detect when you upgrade the CPU does not support more than double the task of nuclear energy, you eat the bones