First use of Photos: fan keeps running

In the few weeks that I've been using my iMac Retina I've never heard the fan. This morning I imported a photo from my iPhone 6 and after that I noticed that while the fan was running high, some iCloud xxx app/task was running in Activity Monitor. I've killed it, rebooted my iMac twice, but still the fan starts running high now and then.
What can I check more?

Hey Hans Elting,
This seems to be happening with a number of folks. Here is the link to that discussions.
high cpu usage all the time
The solution the had to use was to wait it out and it eventually stopped. How long has this been happening on your mac?

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