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Dropbox will occasionally use around 100% of the CPU. Why is this happening and how do I fix it?

From searching around, it seems like it's not an uncommon problem.

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try cpulimit, I use linux but I think it may work for you too, check here: – Aquarius Power Aug 20 '14 at 3:21

Taken from this Ask Ubuntu question:

Dropbox computes a hash of all files that it's going to sync, it uses it both to determine if they changed and to avoid uploading content that is already in their cloud (another customer has the same file). Calculating hashes takes CPU power. It's usually noticeable at login.

So it seems that the only way to fix it, will be to reduce the size of your shared Dropbox folder.

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