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I can think of two cases here:

  • You have been logged in to Cinammon 2D by mistake or without to notice.

This can lead to 100 CPU usage, because at Cinammon 2D the CPU handles all the graphics.

echo $DESKTOP_SESSION

can help you determine the current environment (that is running).

  • It's a bug and you should report it.

I'm using Cinammon at my F20 box and I don't have such problem(s). But, I'm using the version from the fedora-updates-testing repository. If this is a bug and you are using Cinammon/nemo from the stable repository, then it could be fixed in a newer release. So, another workaround here coulde be to enable the updates-testing repository and install nemo (or update the whole Cinammon DE) from there.