Slow boot time after update to Mojave - External SSD

Ik denk dat het probleem in AFPS zit, dit probleem had ik ook met High Sierra en nu ook met Mojave.

plus / minus 3,5 tot 4 minuten opstarttijd. Aansluiting USB 3.0

(iMac eind 2013, 32 GB 1 TB HD)

Opstart schijf: Samsung T5 500 GB

Some problem here but with the internal ssd-drives.

Both 5k-iMac (27"-2017) and 12"Macbook (2016) are taking minutes to boot after power-off.

Clean install of Mojave and use of last Time-Machine-Backup on Macbook didn't change a thing.

I also have noticed that after upgrading from high sierra to mojave my boot times have increased dramatically.

From about half a minute to nearly 5 minutes!

And i don't use an external hard drive.

The thing is, that my boot times are not consistent.

Around 80% it takes about 5 minutes.

The other 20% it starts like normal in about half a minute.

imac 27" 3.5 GHz i7 (late 2013)

1 TB internal flash storage

16GB RAM

Tried all the typical suggestions, resetting cache and so on. First aid program run on boot drive.

Changed nothing.

And again same problem here with a Samsung 850 EVO in an external Icy Box USB 3.1 enclosure connected to my iMac 27" late 2015 model. Had it running under High Sierra on HFS+ without any problems and with a very decent boot time.

Now that Mojave reformatted it to APFS, it takes about 2 minutes between the iMac start up chime and the Apple logo. After that, the boot process continues normally. This is not acceptable at all.

Had the exact same issue a couple of months ago when I reformatted the SAME SSD in the SAME enclosure from HFS+ to APFS (for testing) while being on High Sierra. After I switched back to HFS+, the problems were gone immediately.

So it's definitely NOT the SSD, it's something about the combination of USB and APFS.

So if anybody comes across a solution here, I would LOVE being notified!!!

Best

Same issues with external samsung evo 850. Extremely slow boot times. Also had bootcamp and after upgrade, had to completely reinstall windows. Wouldn’t work at all saying there was no boot partition. So far mojave *****.

I can reproduce this problem on my iMac (Retina 4K, 21.5-inch, 2017), Mojave freaked up the firmware.

It does NOT matter which drive I boot from. Internal, external, USB-Stick with Linux Mint. It always takes 2-3 minutes until the machine starts the boot process.

Even with everything but the keyboard disconnected and starting in diagnose mode ("D" key) or calling up the boot volume chooser ("Option" key) it takes minutes until something happens.

Bernard you think Apple has a bug to fix if everyone can't boot up in a reasonable time? After Mojave was installed on our iMac at the store 2 days ago, our boot up time is 5+ minutes and our iMac barely functions even after logging in. It takes over 10 minutes to log in.

We've tried all the suggested solutions in this thread and have no external drives. No time machine option either, because the genius bar did the reset and installed Mojave for us .

*** do I know. It looks like the firmware thoroughly inspects each and every Bit inside the RAM chips or whatever.

BTW, I have 16GB installed (the "you have to order it from the factory" super expensive upgrade, you know). This was my last Mac, I swear. Bought it in Spring because my 7 year old iMac died. Had to buy 3 adaptor cables to keep my Firewire audio gear and external monitor running. MacBooks have been dropped here in 2016, Windows only on my notebooks now. I love them, they even have touch screens! Fook you, Apple.

Same issue here, updated my Macbook Air (but did not restart it yet to see if it happens there too) and my iMac 2015 which boots from an external SSD (GDrive bought from Apple Store ): very slow boot times and I have to use the ALT option to choose the external drive otherwise it falls back to the default disk where there's an old version of macOS.

Tried the reset PVRAM stuff, no change.

Hope Apple FIXES THIS SOON !

Same thing here. MacBook Pro 15 2013, i7 with 512gb SSD, 16gb memory ram. With High Sierra, 20 to 30 seconds in a cold boot. Now with Mojave, take 2 minutes in Apple logo Screen. And the screen goes blank and comes again. Really don't know what is happen.

Issacwm, I am not sure if you are addressing to me or to maverick1987, but as far as I am concerned, I did not try to reset the SMC too because I have read other testimonials where this did not help either.

Exactly same problem here. After installation of Mojave it takes about 3 - 4 minutes until the apple logo is shown and the boot process begins. It even takes ages to get to recovery mode or bring up the boot menu by pressing ALT key on startup.

I use an external SSD crucial MX300 1TB in an icy box case and USB3. My Mac is a iMac late 2013.

I already tried all the regular stuff like resting SMC or PRAM reset. I went back to High Sierra by restoring my Time Machine backup. Now the boot time is back to about 10 seconds.

Interesting, so replaying the High Sierra Backup also turned back the Firmware? Because it is not a Mojave OS problem, I also have the 2-3 Minute boot delay when I remove my Mojave disk and boot from a Linux partition.

I have the exactly same problem.

I am using the external SSD as a boot disk in a USB C enclosure with a USB3.1 cable.

After the upgrade the boot time is increased to ~5 min.

The same problem was there in High Sierra when I first installed the SSD as a boot device. I noticed that the problem was due to APFS back then. Because the internal HDD was HFS+ while the SSD was APFS, I have read in some thread that if the boot drive is APFS and the internal HDD is HFS+ then the system takes more time to boot. somehow they were not compatible together so I changed the SSD format to HFS+. (now both the external SSD as well as internal HDD was HFS+) and I noticed the problem solved and boot time was ~20 sec.

Fast FW 23 sep.

After upgrade to Mojave- SSD format changed automatically to APFS, while internal HDD was still HFS+ and boot time increased to ~5 min. I thought that this might be because of the same problem of HFS vs APFS incompatibility. so this time I changed the internal HDD format to APFS (I think that was my mistake), because I have read a lot of good stuff about APFS. but nothing helped, the boot time is very long.

If anyone comes with a solution please let me know.

Thanks

seems it is something related to APFS or TRIM

https://cindori.org/apple-file-system-slow-boot-high-sierra/

Since TRIM is not supported over USB in MacOs, it could be APFS problem, not the drive or enclosure.

Thanks