Why does Photos max out my CPU?

Just "upgraded" to 10.10.3 on my MacBook Pro and converted to Photos.  Every time Photos is open, a couple of seconds later, the fan is running full-bore and only stops when I close Photos.  I looked at Activity Monitor, and it is clear Photos is crushing my CPU (see attached screen shot).  What's happening?  Why is Photos crushing my CPU?  Thanks!

Let it run.
See the replies at > Photo is causing such high CPU usage
The 50+ GB Library on my i5 Mac took less than 2 hours to settle down. The same 50+ GB on my 2.4 GHz Core 2 Duo took almost 3 hours.

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