Why is Google Drive so heavy on my CPU?

As the below screenshot shows, despite the fact that Google drive doesn't appear to be doing anything (it's not syncing any data) it's using over 12% of my CPU (a core i7).

Google Drive CPU

The official documentation states:

Depending on your network connection and computer preferences, Google Drive may consume a large amount of CPU to complete its initial sync.

However it has been installed for over a month now and doesn't have anything new to sync. Why, then, does it use so much of my CPU?

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