Late 2013 rMBP feeling a little sluggish, any suggestions?

[Hieveryone]

Late 2013 rMBP 2.6/8/256 model running El Capitan.

I have tried turning it off an on already.

 

[Spudlicious]

Late 2013 rMBP 2.6/8/256 model running El Capitan.

I have tried turning it off an on already.

Fresh OS install?

 

[jerryk]

Make sure you have 20%+ free space on your drive.

If you installed something lately see of it starts up processes at boot.

If you want you can also run diagnostics and see if it detects any failures.