MacBook gets heated up I am running on macbook pro 2015. Since, few days, I have noticed a significant degradation in it's performance. Here is the screen shot of the activity Monitor. Can someone please help me on, how can I get rid of this issue
If your Mac isn't a corporate managed machine I'd go for uninstalling the Tenable Security Nessus software.

Others might have a different feeling about this but you don't need additional security software on OSX.  We run a Mac-only office for years and the only additional security thing we stick with is the 'Little Snitch' firewall app.

I wouldn't have a clue whether the Nessus software has an uninstall app available but if not, try to get rid of these folders:

/Library/Nessus
/Applications/Nessus
/Library/Receipts/Nessus*