iMac takes 123 seconds to wake from sleep

[milleron]

For many months, I thought my iMac 5K with Fusion drive (Mojave) was crashing when it was sleeping because it wouldn't wake.
I finally discovered that it wakes every time and never crashes but that it simply takes a very long time to wake up. I've used a stopwatch on it, and it's spooky that it always takes 123.8 seconds to wake from sleep. For a very long time, I always assumed that it had crashed (before I waited that long), powered it down, and rebooted. Now I simply have to wait, and it resumes, running perfectly, but it's aggravating. I know from past experience that it shouldn't take more than a few seconds.

It has an extra monitor attached via Thunderbolt 2 daisy-chained through an external TB hard-drive enclosure. That setup hasn't changed since I got it about 4 years ago. The wake-from-sleep problem started only about 6-8 months ago.

In Console, reviewing the System log gives me no clue about why it takes so long.

Does anyone have a suggestion on how to troubleshoot this strange problem?

 

[nambuccaheadsau]

Is it by chance the 1TB platter drive model with a miserable 32GB of Blade Drive? What are the settings in Energy Saver?

 

[milleron]

Is it by chance the 1TB platter drive model with a miserable 32GB of Blade Drive? What are the settings in Energy Saver?

It's a new 1TB drive (Apple branded); the original one went bad a month after Apple Care expired. The SSD component is 111 GB (formatted size).
Energy Saver is at default settings except that Power Nap is not enabled. The enabled features are "Put HDs to sleep when possible" and "Wake for network access." The display turns off after 10 minutes of inactivity.

 

[nambuccaheadsau]

Any chance the operating system is on the platter drive? When I had a Fusion drive wake was about three seconds. There is a terminal command which has been posted on the forum. When I see it I shall post it.

 

[Ifti]

Even if the OS was installed on the platter drive, surely it still shouldn't take that long to wake?....

 

[milleron]

Even if the OS was installed on the platter drive, surely it still shouldn't take that long to wake?....

Agreed, it shouldn't be necessary to read or write to or from the drives to wake from sleep. In sleep, RAM contents are preserved. Really, to wake from sleep it shouldn't be necessary to do anything other than spin up the platter drive(s) and restore full power.

If System logs don't suggest what's taking so much time, is there anywhere else to look? (Or maybe I simply don't know how to find the problem in the log; I'm not an IT pro.)