Windows Defender and wsappx using lots of memory

This could be what is slowing my system down?

I find that this is often the cause of a period of poor performance during the first 5-10mins after turning on from a full shutdown. Once the tasks have been completed everything is back to normal. The effect is less noticeable after a hybrid shutdown which you get if Fast Startup is turned on in the power options > choose what the power buttons do.