If you have Zedge, this is what is causing it.
I had also done other updates and thought it was Android System WebView as it started right after that had updated. Then I read it's Zedge and I've had that program for almost 2 years. I had restarted phone and was again stuck on "Optimizing", but for me each time it has been a good 20 minutes.
I uninstalled Zedge and it started right up, no Optimizing. Thanks for everyone who figured this out!
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I found a solution that need no flashing.My s6 edge plus behaved same way.I left like that because I did not want to lose some applications. On the third day it booted normal.
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