Slow operating system in Monterey 12.7.6

Do to mean this one ?

In either case, the computer may have a Rotational / Mechanical Drive or a combo of a SSD and Mechanical Drive ( Fusion Drive )

Then how much RAM is it configured with ?

Rotational Drives are slower than SSD Drives.

Fusion Drives are a bit faster as the SSD is used for some things but the Mechanical portion is going to slow things down

iMac (Retina 5K, 27-inch, Late 2015)

• 3.2GHz
  • 1TB (7200-rpm) hard drive
  • Configurable up to 3TB Fusion Drive or 256GB or 512GB of flash storage (SSD)
• 3.2GHz
  • 1TB Fusion Drive
  • Configurable up to 3TB Fusion Drive or 256GB, 512GB, or 1TB of flash storage (SSD)

• 8GB (two 4GB) of 1867MHz DDR3 memory; four SO-DIMM slots, user accessible
  • Configurable to 16GB or 32GB

Malwarebytes is OK. I use it but only when needed manually. Not sure what the WD and Seagate helper tools are since I do not use them with my WD drives so cannot speak to impact.. You have a Fusion Drive and it shows slow read/write speeds compared to the newer Mac computers. You are also running xProtect which I assume is for some video security use but if only active using video should not slow your Mac down. I see nothing else but like I have hinted your Mac is now considered old and you may want to look at a later model the has an SSD drive and more Ram. We should let others comment on the report.

Regardless if the computer was ReBuilt by Apple service Centre

The machine is 10 years old with a Fusion Drive and only 8 GB RAM

It has had a long life and time to look for something much newer with an SSD configuration and at least 16 GB RAM

Have you started up your iMac in Safe Boot mode?

Start up your Mac in safe mode – Apple Support (UK)

You should see this (in red font) in the top right corner of your screen:-

Afterwards, re-start normally.

Has that made any difference?

We need more info. You have not stated exactly what model you have as far as the drive or RAM. You may have a 5400 RPM drive or a Fusion drive which can be slow by them selves. Do you have 8GB of ram or more? Do have apps starting at login or not. How did this Mac run after the 2024 rebuild? Has it always been slow or just recently?

MktSol wrote:

1.02 TB Fusion Drive.

Your Mac contains 4 memory slots, each of which accepts

a 1867 MHz DDR3 memory module. 2 are in use, factory installed, 2 are available.

Hope this gives all the info needed to troubleshoot.

Suggestion 😎

To get the replies to your question in chronological order by Date 

Click on your User Name  >>   >> " Edit Profile and Preferences "

Scroll way down and look for >> >> " Other Preferences "

Change the >> >> " Default thread sort " to Oldest 

Not the email app that could cause the slow down. I'm guessing you have slow drive which only will get slower with each new OS update. Also you can use more Ram (at least 16). I would run the free app EtreCheck which may find some issues. You can post the report here for us to review. No personal data will be revealed. Also, be sure you do not have any anti-virus programs running. They are not needed.

MktSol wrote:

The reboot took a very long time but other programs are working a bit better. Mail is still an issue but that I know is a factor of dealing with the import of gmail. Thanks,

You are most welcome! 😄