I've found that a MacBook Pro laptop I use often will slow unbearably. When I check the cpu utilization, I usually find some third-party application is consuming an inordinate amount of CPU time slowing the system. Today the problem was due to the AgentService process associated with an enterprise backup program, Connected Backup, from Hewlett Packard (HP). HP acquired the software when it purchased Autonomy Corporation, which had itself obtained the software through the purhcase of Iron Mountain's technology arm, "Iron Mountain Digital". Previously, I've seen the same CPU utilization problem due to the AMPAgent process from Kace.
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