Progress bar on start-up

I feel completely stupid to ask these questions, but I'll ask rather those of you who know what you are doing rather than mess up something. When I boot my iMac (late 2013 27 "iMac - 32 GB of memory OS X El Capitan 10.11.2 v) I get a black screen with the apple logo and a progress bar every time like it is reload the operating system.

Is this normal? It really slows the startup.

Yes, it's normal.  Your computer starts.

Tags: Mac OS & System Software

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