Imac late 2015 MacOS Monterey Slow ( EtreCheck )

Get rid of the BX500 SSD as it is complete junk and get the Crucial MX500 SSD as suggested by @den.thed. The BX series is a low end budget economy model which has lots of issues including overheating & becoming thermal throttled, naturally slow with a very small & poorly implemented write cache, no DRAM so random access is slower, and has an extremely high rate of failure (sometimes right out of the box). You could not pay me to use one.

FYI, you will find the SSD begins to slow down after writing to it for 30-40 seconds once the SSD's write cache has been filled. Continue writing to the SSD for much longer and the performance will continue to drop and the SSD's temperature will rise....once the SSD's temperature reaches 70C, the SSD will be throttled. Once the SSD has slowed to a crawl, it will take a long time before its performance will be restored. An OS install, restore from backup, and system updates can easily cause this problem with this particular SSD.

It is sad to see a respected company such as Crucial put out something so awful, but unfortunately they are not the only ones doing things like this these days.

There is something wrong with your 2T Crucial BX500 SSD.

The Write speed is only 8 MB/s and the Read speed is only 58 MB/s.

A SATA 2.5" SSD should Write & Read somewhere around 460 to 480 MB/s.

Where did you purchase the Crucial BX500 SSD...?

The Crucial MX500 are far more reliably than the BX500 budget models.

https://www.crucial.com/ssd/mx500/ct2000mx500ssd1?

I agree there is an issue with the SSD, and that the BX500 has an unfortunate history, but I do not think it is failing. This:

Drives:

disk0 - CT2000BX500SSD1 2.00 TB (Solid State - TRIM: No) ⚠️

Internal SATA 6 Gigabit Serial ATA

Were it sick, this value shown in the resutls:

File system: 37.09 seconds

would likely be much higher, closer to the time-out value of 120 seconds.

In doing HDD to SATA SSD conversions, I found that, although fast when first installed, SATA SSDs start to slow over time to incredibly abysmal speeds if TRIMForce is not enabled. Been there; done that. Your SSD should be doing an minimum of 480-500MB/sec.

Before doing anything else:

1) Out of an abundance of caution, repeat the EtreCheck test with all external drives disconnected, especially the G-Tech USB-2 drive. I've seen reports like this here where some USB-2 external drives slowed overall performance. Not common, but easy enough to test.

2) If that does NOT return SSD speeds to the 480-500MB/sec range or better, BACK UP your drive before engaging TRIMForce BUT...

...DO NOT use the third-party TRIM enabler that is on your hard drive. Instead, use the Terminal method laid out in this article:

HOW TO EXECUTE ‘TRIMFORCE’ COMMAND WITH YOUR SSD

Speeds will NOT increase immediately. Restart the computer in SAFE MODE. Once you have a Safe Mode desktop, do nothing else except walk away. Let the computer sit unused in Safe Mode for about hour so SM can do its work. This will NOT erase your drive.

Subsequent tests may show little or no improvement right away/ So do the safe mode boot again and let it sit. It took about three of those, allow at least 30 minutes, before my Mac's responded to TRIM on an aftermarket SATA SSD installed.

NOTE: on my Mac, SSD speeds were excellent for about 2 years without TRIM but then plummeted. Today it is back to its speedy self.

CCleaner has to go. Earlier incarnations of it to were eager to flag important system files as junk and tell users to dump them.

Macs—cat-like— clean themselves, and have for over 20 years. Your paid Apple good money to create and implement elegant and automated self-maintenance routines that do all the housekeeping needed in the wee hours of the morning when most people don't use their comptuers. They even defrag.

The industry knows this. To me, that make any third-party products that claim to clean, optimize, tune-up, or otherwise play maid to your Mac a four-letter word that starts with "s."

In addition to your failing boot drive you've installed software that is not needed and can hinder performance further: CCleaner and Free VPN.

First, there is no reason to ever install or run any 3rd party "cleaning", "optimizing", "speed-up", anti-virus, VPN or security apps on your Mac.  This documents describe what you need to know and do in order to protect your Mac: Effective defenses against malware and other threats - Apple Community and Recognize and avoid phishing messages, phony support calls, and other scams - Apple Support.  

There are no known viruses, i.e. self propagating, for Macs.  There are, however, adware and malware which require the user to install although unwittingly most of the time thru sneaky links, etc.   

Anti Virus developers try to group all types as viruses into their ad campaigns of fear.  They do a poor job of the detecting and isolating the adware and malware.  Since there are no viruses these apps use up a lot of system resources searching for what is non-existent and adversely affect system and app performance.

There is one app, Malwarebytes, which was developed by a long time contributor to these forums and a highly respected member of the computer security community, that is designed solely to seek out adware and known malware and remove it.  The free version is more than adequate for most users.  

Unless you're using a true VPN tunnel, such as between you and your employer's, school's or bank's servers, they provide false security from a privacy standpoint. 

The first thing you should do is make sure you have a full and current backup of your boot drive.

It will probably cost more than the iMac is worth to replace the internal SSD. With that in mind you might c consider getting an external SSD, cloning your boot drive to it with Carbon Copy Cloner and boot and run from it. That would allow you to take the drive with you when you upgrade your iMac. I would recommend OWC (MacSales.com) external SSDs as they are considered the premier Mac hardware supplier by most of the experienced contributors here.

Note: uninstall CCleaner and Free VPN according to the developer's instructions. If you go the external SSD route do so before cloning your boot drive to the external SSD.

If you go that route call OWC Customer Support to see which of their models they recommend for your iMac model, workflow and budget requirements.

Apple has no clue about third party SSDs such as Crucial's BX500 series. I have direct personal experience with them from supporting my organization's computers.

As for a manufacturer warranty, the SSD is working as designed....very poorly. There is a slight chance you could get a warranty replacement, but I doubt it unless the SSD shows an actual SMART failure or degraded SMART health attributes. Besides it won't make any difference, the BX500 series is just that bad. These low end budget SSDs are meant for reading data, not writing large amounts of data. However, the BX500 SSDs higher rate of failure makes it a poor choice even for that scenario.

MiguelAA28 wrote:

i brought it from Mirco center and installed it on my own

How long ago did you buy and install the Crucial SSD...?

What kind of in-store or manufactures warranty does Micro Center provide...?

This computer has a failing harddrive. This is the cause of the computer being slow.

You might want to consider an ssd upgrade

👍 Allan

I saw no trim as well, which is why I asked MiguelAA28 "How long ago did you buy and install the Crucial SSD...?"