We haven't had any issues like that reported on the support side, so I would strongly recommend that you open a support case so we can dig into this further. Please provide the following details in the case description:
- does this happen on all machines with an agent, or just some?
- do all the machines seeing the issue have the same policy assigned?
- what version/build of the software are you running?
Agents are designed to be incredibly lightweight - most users don't see any impact to performance at all, so there is definitely something amiss. Go ahead and open a support case and we'll be happy to connect and take a look at this with you.