Finder Runs SLOW, hangs. AKA "Persistent Pinwheel of Perdition"

The keystone agents or daemons are running all the time in the background even if Chrome is not (and, I suppose, even if Chrome has been deleted). At times they can cause a spike in processor use and make the system crawl.

Here is what I recommend:

Make sure your Time Machine is fully updated.

Create a Catalina installer:

Using Safari, download the installer from here: https://support.apple.com/en-us/HT211683

[if the installer starts automatically, quit it now]

Follow the instruction here to create an installer disk on a usb thumb drive: https://support.apple.com/en-us/HT201372

After being sure that you have the Time Machine accessible and that everything you had on that SSD was copied off somewhere else:

Restart holding down the Option key and select the installer drive you have just created.

Using Disk Utility from the installer drive, completely erase the SSD (the whole drive not just some volumes in it), choosing APFS with GUID partition table.

Install Catalina on the SSD.

When asked about migrating, you can point to the Time Machine backup as the source.

IMPORTANT: check only the user accounts, and NOT applications, settings or other files.

When finished you will experience a new mac :-)

It looks like your system is a bit of a mess right now. This can be the result of multiple upgrades in place over the years.

Please run Etrecheck and post its full report here. Use the "additional text" button and paste the report into the text box.

This will help us know more, so we can help more effectively.

Several problems that I can see from the report. I will list some of them below.

Your mac has a rotating hard drive. HD are much slower than SSD, and with newer OS versions that difference is ever more noticeable. You also apparently have an external SSD. That may give you a good solution going forward, I will write about it in another post.

You have several kernel extensions, some quite old:

Kernel Extensions:
  /Library/Extensions
    [Not Loaded] FTDIKext.kext - com.FTDI.driver.D2XXHelper (1.0 - SDK 10.14)
    [Not Loaded] FTDIUSBSerialDriver.kext - com.FTDI.driver.FTDIUSBSerialDriver (2.3 - SDK 10.9)
    [Not Loaded] hp_fax_io.kext - com.hp.kext.hp-fax-io (5.11.0 - SDK 10.8)
    [Not Loaded] hp_io_enabler_compound.kext - com.hp.kext.io.enabler.compound (3.2.0)
    [Not Loaded] hp_Inkjet9_io_enabler.kext - com.hp.print.hpio.Inkjet9.kext (2.3.1 - SDK 10.8)
    [Not Loaded] MotMobileUSB.kext - com.motorola-mobility.driver.MotMobileUSB (1.2.2 - SDK 10.5)
    [Not Loaded] kudshawking.kext - hk.uds.netusb.controller (1.59)

Note that one that says SDK 10.5? 10.8?

Do you still need a driver for a Motorola device from ten years ago?

Under Launch Agents, you also have a few:

Launch Agents:
  [Not Loaded] com.adobe.AAM.Updater-1.0.plist (? ffb65062  - installed 2018-07-14)
  [Other] com.adobe.ARMDCHelper.cc24aef4a1b90ed56a725c38014c95072f92651fb65e1bf9c8e43c37a23d420d.plist (Adobe Systems, Inc. - installed 2021-02-10)
  [Not Loaded] com.adobe.AdobeCreativeCloud.plist (Adobe Systems, Inc. - installed 2018-07-14)
  [Loaded] com.adobe.ElementsAutoCreator-17.0.plist (Adobe Systems, Inc. - installed 2018-11-17)
  [Running] com.adobe.GC.AGM.plist (Adobe Systems, Inc. - installed 2021-04-16)
  [Not Loaded] com.adobe.GC.Invoker-1.0.plist (Adobe Systems, Inc. - installed 2021-04-16)
  [Other] com.brother.LOGINserver.plist (? a1772de2  - installed 2015-03-12)
  [Loaded] com.google.keystone.agent.plist (Google, Inc. - installed 2021-03-04)
  [Loaded] com.google.keystone.xpcservice.plist (Google, Inc. - installed 2021-03-04)
  [Other] com.mcafee.McAfeeSafariHost.plist (? 0  - installed 2018-10-22)

Notably, you have still remnants of mcafee. The google keystone stuff are known hog resources.

I am not familiar with this "pcshow" software, but it installs several agents and daemons. It may be just fine, I am just not familiar with it.

As I suspected, you have been successively upgrading the software on this mac, perhaps since 2013.

While that is very convenient, at times it is best to start fresh. Fortunately this no longer as hard as it used to be.

You have an internal 3TB drive, but not much space on it is used. In fact the contents would fit comfortably in one 256GB SSD.

I recommend a full backup, followed by an erase and install.

That alone should help, but since you have apparently two SSD, it will be even better if you install the OS and one of them, and just use the internal HD to store extra data.

If you consider doing this, let me know and I will provide detailed instructions.