Slow boot time after update to Mojave - External SSD

I had my system like you, internal hdd with high sierra and external ssd with mojave. Boot time become slower then internal hdd. Installed the mojave on the internal hdd too. Now mac takes forever to boot.

I’ve installed Mojave on both, internal and external disks and I still having the same problem.

I’ve an imac late 2013 and booting fron a usb3 enclosure with and ssd. In high sierra the boot time (before logo appears) was seconds, now with Mojave more than 4 minutes

...guess we all have to wait until macOS 10.14.1 is released. I read somewhere else that this update will resolve our USB slow boot issue. Let's hope it doesn't take too long until our favorite company releases the update....!

As I've already mentioned, I'm seeing the boot delay at worst on iMac with external SSD boot - but just to add, I'm also seeing a bit of a boot delay on my MBA, which has internal SSD - it's about 30 seconds from turning MBA on to it fully starting up, which is about 15-20 seconds slower than before Mojave.

There are always risks when you play with file system conversions. I suggest to take a full backup before. Moreover I have no idea if this is something officially supported by Apple (Mojave on HFS+), but it works.

I have the exact same computer and External SSD with USB UASP enclosure, and the problem is the same, unfortunately I don't have a Thunderbolt enclosure to test it. I really hope there's another solution.

Hi Alessio.

For the copy you used a trial version of Carbon Copy Cloner or is neccesary to buy a license?

After this Files-system change your Mac and the software installer does it work the same?

Tell us About your Mac now!

I want to add a note about Delock 42510 case. My 2.5'' 9mm SSD drive reaches ~39-40 C temperature (with 20 C ambient and drive in idle state). In my 3.5'' USB case it was ~30 C and reached 40 only when I copy something. So, Delock is not very good in removing heat for thin drives and will need some thermal gap filling pads.

That's really interesting! From what I've read on a couple of websites, TRIM is not really necessary with current SSDs these days because they all have a feature called "garbage collection" directly built into their firmware which takes care of those blocks... I am not really an expert in these matters myself though.....

I activated trim on my crucial SSD (external) and it had no effect on the boot time. I also can not see any change in the hardware inspector window. Maybe it was just rejected on activation. I still need about 3 Minutes until the iMac is booting.

I have the same slow boot/black screen before the apple logo appear.

Mac (21.5-inch, Mid 2014), 1,4 GHz Intel Core i5, 8 GB 1600 MHz DDR3 with external SSD inside an enclosure with USB.

So, I had to reinstall Maverics, then upgrade to High Sierra. Everything has gone, not able to get anything from Time Machine for the reason I have a newer version of MacOS on it.

I had to reinstall anything from scratch.

I am sure Apple will do a fix for this issue. We are a lot of Customers with this issue.

Have a nice day everyone !

As usual! Apple does a mess leaving users completely alone with no info, no updates, no suggestions other than the usual reset pram or other silliness like that...

When the f**K will you be SERIOUS about the issues of OS, about the evident programmed obsolescence of devices, about all the replaceable parts hidden in the market so we have to buy new machines due to minimum and easily solvable damages to the ones we already have?
Since the day after Mojave distribution, 90% of users in the whole world started to face an incredibly slow boot time and all you are able to suggest is reset the pram?
Are you joking guys???
Move your ***** and resolve this incredible bug!!!

I suggest to stay calm nevertheless. Between developer betas, public betas and the final release version, features and properties are being added and removed back and forth all the time as everybody knows. I think it's pretty safe to assume that macOS 10.14.1 will be released within the next 10 days because the fourth pre-release version already went to the developers a couple of days ago. Then we'll see, but not just now.

If our problem should really persist with 10.14.1, I will seriously consider buying a Thunderbolt enclosure after all. It's not even the money that bugs me most about this (although paying 140 USD for the enclosure and a cable just to get back to the way things were before Mojave is really bad news), it's rather the fact that the enclosure needs a separate power supply (even if this is included with the enclosure). This means another power cord hanging from the back of my iMac, another power socket occupied underneath my desk and so on.

Well, let's hope for the best and a speedy release of 10.14.1 in order to be clear about things.

I am sure that most people here are actually not upset because of the actual loss of 3-4 minutes work or leisure time but because of the fact that we now have a piece of hardware that at least once was way more expensive than average - and now this piece of hardware needs 3-4 minutes to boot itself which really is not acceptable.

I've opened a ticket with Apple support.

What they said about this issue is that they cannot guarantee that external drive from other vendor will work.

What a great answer from a great vendor!!!😠 Is this what you expect?

Let's think on your next buy.... Apple or Pear?