iMac 27 2019 slow wake up from sleep

[Robertus]

Hello all,

I have this iMac 27 2019 (Retina) running 10.15.7 since 2020 and I have been noticing that whenever I try to wake up the Mac from sleep, whether for a short time or long time, it is slowly waking up, not immediately waking up. While I press any key to wake up the Mac, the monitor shows dark/dim screen for a bit, then coming to ready-use displaying the desktop. Should I be concerned? It seems restarting the Mac is the only solution to resolve this issue. I have this smcFanControl app that tells me the temp is around 99-100 F at 1200 rpm. I have Screen Saver enabled and Energy Saver shows unchecked boxes on prevent computer from sleep automatically when display is off and put hard disks to sleep when possible, but checked boxes on the rest (last 3 options).

I appreciate feedback, thank you.

 

[Bigwaff]

Does your iMac have an internal Fusion Drive?

 

[Robertus]

Does your iMac have an internal Fusion Drive?

Yes.

 

[AL2TEACH]

put hard disks to sleep when possible,

I have a 2015 iMac but I (took it to a shop) replaced the spinner with a SSD. I never checked the put to sleep box with the spinner. Try unchecking that box to see if it still happens.

"it also results in higher access time when waking up the hard disks. " is from this article

Put Hard Disks to Sleep When Possible on Mac, Enable or Not?

This post aims to let you understand the put hard disks to sleep when possible feature on macOS and answered whether you should enable it on Mac.

iboysoft.com

 

[Robertus]

I have a 2015 iMac but I (took it to a shop) replaced the spinner with a SSD. I never checked the put to sleep box with the spinner. Try unchecking that box to see if it still happens.

"it also results in higher access time when waking up the hard disks. " is from this article

Put Hard Disks to Sleep When Possible on Mac, Enable or Not?

This post aims to let you understand the put hard disks to sleep when possible feature on macOS and answered whether you should enable it on Mac.

iboysoft.com

Mine is unchecked.

 

[AL2TEACH]

Mine is unchecked.

I blame my eyes and brain for not working together
You could try https://etrecheck.com/en/index.html a very good tool to spot problems.
Just curious but why not upgrade the OS?