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botnet means an compromised computer becomes a zombie roBOT waiting to rise and perform tasks designated by the creator as a part of a NETwork of these zombies.
The computer may wait until there is no user activity, at which time the BOT wakes up and starts doing its task (which may include phone home to get said task and report data collected from a prior task.
Not all Malware manifests itself with crappy performance. The well written stuff is near undetectable.
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