MacBook Pro insanely slow after reboot

I've just rebooted my Macbook Pro mid 2012 and I've done a factory reset due to some problems before. I reinstalled el Capitan (which took all night to download) and now it took me so long just to set up a user account. Even when I type a letter the rainbow wheel appears and I have to wait.

Things I've done:

-Repaired disk (everything was fine)

-Done the PRAM thing

-Tried booting into safe mode but it's still very slow.

-Tried restarting

-Reinstalled OS

This should be naturally fast since I've installed an SSD inside, however as I was updating to High Sierra my laptop died due to me being away from it and the extension of the charger was taken. As I tried to restart the download I have experienced insane lag.

MacBook Pro, OS X Mountain Lion (10.8.5)

Posted on Mar 9, 2018 12:00 PM

Posted on Mar 9, 2018 1:31 PM

To help troubleshoot your Mac, I would suggest that you consider using EtreCheck and posting the resultant report for us to review. (Note: The EtreCheck reports does NOT contain any personal information.)

You can download EtreCheck from here.
Start EtreCheck from a normal user account. Optionally, you can run it from a user account with Administrator privileges.
Select a problem from the drop-down menu to enable the "Start EtreCheck" button. Optionally, you can add comments on what issues your Mac is experiencing, especially to aide others with similar Mac issues.
Click on Start EtreCheck
Allow the program to run to completion.
When done, select Report from the left-side window to display it.
Select the "Share Report" icon.
Select Copy Report
Paste the report to your reply post.

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MacBook Pro insanely slow after reboot

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