My MacBook is slow recently. How do I fix this? My MacBook has become very slow recently and not because of any software update. But it just became suddenly slow. Logging in to my account takes 2 minutes and even opening a terminal window takes a while to load. Apps take a while to open and quit. I even tried to reinstall macOS without formatting my drive but my MacBook is still as slow as a snail. 

PS. I have 24GB left on my 120GB drive.

EDIT: I have a MacBook Pro (Retina, 13-inch, Early 2015) with 8GB ram. I am using this MacBook for 3 years.

What ideas should I consider next?
It looks like you have sufficient Disk space and RAM.

If your battery is EOL (died) or not holding charge... 

Mac will cut the CPU clock speed to 1/2 of maximum that will impact all and any operations.

Install Intel Power gadget to verify your CPU, this is an example of normal speed CPU.



Use the Activity Monitor to see who is responsible. Here are my examples.







Notice the Disk activity as Data/Sec

Finally about the battery (check this on your computer)