It is because default(windows) programs are loading as well as the ones you installed and had the setting to start as soon as you log in.
Anti Malware service is a default scanner from Windows scanning your computer at startup
You can disable it.
Follow these steps:
a. Press Windows key + W and type administrative tools.
b. Select Administrative Tools and select Task Scheduler.
c. Follow this path in the left hand pane. Task Scheduler Library/Microsoft/Windows/Windows defender
d. Uncheck all the boxes under Idle, Power and Network.
e. Now it won’t scan your computer.
I hope it helps.