MacBook Pro 15" Ret. Display Late 2013 slow after logicb. replacement

The logic board had been damaged from overheating so I replaced it with one from this website. It went well and everything runs without errors but its just very slow. I updated the OSX and then completely erased the computer so it should be running rather well? What can I do? Thanks.

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Let's see if the onboard diagnostics points to something. Restart the system and press the D key. Let us know the the error codes are.

Reference: Mac startup key combinations