copied Etrecheckpro, please check?

Remove NordVPN using their uninstaller, then confirm all processes relating to Nord have been removed with another EtreCheck report.

That is why you are experiencing poor internet performance, and your files are being scanned by Nord slowing down your computer.

That's a MacBook Air (Retina, 13-inch, 2020) with a 1.1 GHz Core i3, 8 GB of RAM, and a 256 GB SSD. You have about 200 GB of space free on the SSD, so a lack of free drive space is not the problem.

Top Processes Snapshot by CPU: Process (count) CPU (Source - Location) mediaanalysisd 27.04 % (Apple) mds_stores 17.74 % (Apple) WindowServer 16.98 % (Apple) cloudphotod 14.60 % (Not signed) kernel_task 13.13 % (Apple)

Looks like your MacBook Air may be spending a lot of time analyzing media libraries (including your Photo library) and rebuilding Spotlight indices ("mds_stores" task). By any chance, did you you install a macOS update/upgrade recently? If so, you may want to leave the computer turned on for a while to catch up on background work.

Virtual Memory Information: Physical RAM: 8 GB Free RAM: 31 MB Used RAM: 5.92 GB Cached files: 2.05 GB Available RAM: 2.08 GB Swap Used: 0 B

You had enough RAM for what you were doing at the time you ran the report. (Your Mac put almost al of the spare RAM to work holding Cached files, but would have reclaimed that automatically as needed.). Swap Used was zero, so the machine never had to simulate real RAM using the slower SSD.

VPN:

 A virtual private network, or VPN, is a private connection over the Internet from a device to a specific network.   VPN technology is widely used in corporate environments. If you need to be "present" on an institutional network, a VPN is a great tool for accomplishing this. It is generally issued and controlled by the institution.

Almost all other uses are a SCAM. There is generally no need for you to have a private (and almost always MUCH slower) connection to a VPN vendor's Network, except to make it easier for them to harvest your data to sell. If you are behind a Router you control or Trust, there is NO security advantage whatsoever in using a VPN. Your connections are already encrypted in most cases.

If VPN vendors just stopped there, it would be bad. But many of these packages also insist on scanning all your files, non-stop, -- nominally looking for viruses, but who knows for sure what data they are harvesting. Their non-stop file reading punishes your computer's performance in the process. 

Some also break into your other secure connections so they can be FIRST to examine your data, often leaving your Mac MORE vulnerable to attack.

What VPN service to use? 

DON'T use VPN services

https://gist.github.com/joepie91/5a9909939e6ce7d09e29

VPN: What you need to know - Apple Community