My 2020 Mac book Air is running very slow

I did a quick review of the provided report and here are my observations/suggestions:

• Completely remove Avast Cleanup. Your Mac does not need, nor should it use any type of third-party "cleaner" apps. These tend to cause more issues than resolve them.
• Stop using Google Chrome. It tends to be a memory hog. (You can verify this by examining the "Top Processes Snapthot by Memory" section in the report.) If you prefer the Chrome-like interface, I suggest you consider trying out the Brave browser.
• Your Mac currently is running 44 3rd-party apps. Carefully review them to see if you still need to use all of them, and if not, completely remove those you never or rarely use.
• Follow the recommendations to remove items listed in the "Clean up" section of the report.
• One of the reasons I mentioned that you should remove Avast can been seen in the "Diagnostics Information" section of the report. It is the first item listed. That Avast "security" app has already crashed 10x since 11/23.

The following are a few articles that you may find helpful in understand why Macs don't need 3rd-party AV or cleaner apps:

• Security. Built right in. - Apple
• Apple Platform Security - Apple Support
• Effective defenses against malware and ot… - Apple Community
• Securing the modern Mac: an overview - The Eclectic Light Company

I'll answer your last question first ... and that answer is "yes." Basically, if you want to start with a "clean" make, you would first fully erase the drive, and then, reinstall macOS via the Recovery Mode ...

... but I think that is not necessary at this point in time.

Instead, let's start by removing Avast and see if the Mac's performance improves.

To remove Avast, try using its uninstaller app, if it included one. Let us know if it doesn't and we can provide you with the steps to do so "manually."

Thanks for the new report. One thing right away is the overall performance of your Mac increased from "Below Average" to "Good" so you know you are heading in the right direction.

The other important thing is that you do NOT need to remove all of these 3rd-party apps. I'm just suggesting that you review the ones you installed, and if you are rarely using some, just delete them. Just removing Avast has already made a difference. Don't fret over removing all of these.

To help point you to where Adobe "hid" some of its files, just look closely at what the report is telling you. For example, under the "Unsigned Files" section, it lists the com.adobe.ccxprocess.plist file is located in the ~/Library/LaunchAgents/ directory. The "~" means the Library folder for your user account. Just use the "Go to Folder" option from the Finder's menu bar to change to the appropriate folder ...so, in this example, you would enter: ~/Library/LaunchAgents/, and then look for the com.adobe.ccxprocess.plist fle, then delete it.

Note: It is always best to use the apps's uninstaller instead of manually deleting files. Of course, if the app doesn't offer an uninstaller, you won't have that choice.

Most apps store their respective files, that you don't find in the /Applications or /Utilities folders, are in the following folders:

• /Library/Application Support/
• ~/Library/LaunchAgents/
• ~/Library/LaunchDaemons/

... and it looks like you did completely remove Avast! Great job!