2019 Retina 5k 27 inch runs slow EtreCheckPro help

To add a bit to John Galt's excellent comments, the other culprit for poor overall performance is a failing Fusion Drive. Since your iMac is using one, doing a deeper dive in the health of both parts (SSD & HDD) of this type of drive is in order. One great tool for this is DriveDx and I suggest that you get yourself a copy as it will come in handy in your "troubleshooting" toolbox.

What you posted is not an Etrecheck report. Rerun Etrecheck and add the report as follows:

Copy the report

and after clicking on the Reply button use the Additional Text button to paste the report in your reply.

Then we can examine the report and see if we can determine the cause of the problem.

Comments:

No Time Machine backup - Time Machine backup not found.

• It should go without saying, if you do not back up your Mac, by definition the prospect of suddenly and irretrievably losing everything it contains does not concern you in the slightest.
• Google products including "Backup and Sync" will burden any Mac regardless of its configuration. Its processes run all the time, updating themselves and scouring your Mac for personal information it constantly uploads to Google for its own purposes. That may be the reason EtreCheck took an unusually long time to run, as well as its "Heavy I/O usage" comment.
• If you are required to use Google products buy a Chromebook.
• macOS Time Machine is relegated to a background task that does will cause any noticeable performance degradation: Back up your files with Time Machine on Mac - Apple Support

Also, I was planning on upping the RAM with 2 16Gb additions.

• 8 GB RAM is not an abundant amount, but it is very easy to determine if that Mac's performance is being limited by it. Refer to Check if your Mac needs more RAM in Activity Monitor - Apple Support. If its unitless "Memory Pressure" graph is frequently "red" your Mac would benefit from additional memory. If not, it won't. It's that simple. Memory has recently become expensive — prices have approximately doubled in the past six months — so you would not want to buy more unless the cost is justified.

System Software:

macOS Sequoia 15.7.4 (24G517)

• Update it: Update macOS on Mac - Apple Support

Configuration Files:

/etc/hosts - Count: 1

• That may be worth investigating. Read Fixing a hacked /etc/hosts file - Apple Community.

An additional concern is the use of (PACE Anti-Piracy software. Unless it is mandated by your company, bank or other institution I recommend that you uninstall it according to the developers instructions. It is not needed with Macs.

Afterward use the shareware app Find Any File to search for any files with a particular file name.  For PACE software you'd do the following search(es): 

1 - Name contains pace

Any files that are found can be Option dragged from the search results window to the Desktop to get a copy of the file.

FAF can search areas that Spotlight can't like invisible folders, system folders and packages.  

Anyone else seeing this:

when they click on the EtreCheck report box? The text is identical to that in the gray box in this thread:

How can I stop a persistent cyberstalker … - Apple Community

No EtreCheck report there at 1600 hr PDT 5 May

I'm seeing that in a fully updated Safari. Obviously we had maintenance today 5 May.

OT wrote: What you posted is not an Etrecheck report.

It appears that this is a known BUG that started with the recent session of furniture moving in the forums. The report was obviously visible at one point because others answered OP based on a proper report.

The bug is that it is now populated with text for another thread. The spurious text is the same every time this happens.

Report, report.

I can´t see the Etrecheck-report either?

I thought, only those at Level 10 could see it?

Another Sarcastic, remark from the undersigned.