Lagging at start up (Retina, 15-inch, Mid 2014)

I recently purchased my 15-inch MPB laptop. There seem to be quite a bit of lagging. The odd thing is when I apply authentication (login screen) on my laptop the lagging seems to disappear. I started noticing it when i got rid of my login-at-start-up setting. Has anyone experienced this issue before? If so, can you give me an insight how to remedy this issue.

Hey there blesilda,
It sounds like you are getting some unexpected system slowness on your MacBook Pro. I would first recommend you reset your SMC and then your PRAM in that order and try the issue again:
Intel-based Macs: Resetting the System Management Controller (SMC)
Shut down the computer.
Plug in the MagSafe power adapter to a power source, connecting it to the Mac if its not already connected.
On the built-in keyboard, press the (left side) Shift-Control-Option keys and the power button at the same time.
Release all the keys and the power button at the same time.
Press the power button to turn on the computer.
Note: The LED on the MagSafe power adapter may change states or temporarily turn off when you reset the SMC.
Then:
About NVRAM and PRAM
Shut down your Mac.
Locate the following keys on the keyboard: Command (⌘), Option, P, and R. You will need to hold these keys down simultaneously in step 4.
Turn on the computer.
Press and hold the Command-Option-P-R keys before the gray screen appears.
Hold the keys down until the computer restarts and you hear the startup sound for the second time.
Release the keys.
After resetting NVRAM or PRAM, you may need to reconfigure your settings for speaker volume, screen resolution, startup disk selection, and time zone information.
If the issue persists, I would next perform a Safe Boot which runs a disk check and disables extra features, then restart and try again. 
OS X: What is Safe Boot, Safe Mode?
Thank you for using Apple Support Communities.
Regards,
Sterling
Thank you for using Apple Support Communities.
All the best,
Sterling

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