If this is true then why does Apple still sell iMacs with HDD's?
Because they want to give people options, and sometimes that comes with compromises. However the majority of Macs that Apple sells today does come with SSDs.
It IS true that since maybe Yosemite, the OS has been more and more demanding and more optimized for SSDs tan HDDs.
I have an OS backup on a regular HDD and I couldn't even think doing my daily work on this thing, HDDs are incredibly slow for modern OSes. Even on my 5,1 cMP, which is still a pretty fast machine, running the OS on a HDD would be painful.
Get yourself a SSD as soon as you can because macOS is never going to get faster on HDDs. Trust me it will almost feel like a new computer.
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I am having the same problem which is how I got here. I boot my mac up and there is a black screen for a solid 3 minutes until the actual apple logo comes up and starts loading my OS. I've tried everything and nothing works.
Also, my mac is running on an SSD. So I don't think its an actual 'speed' issue. I think its a bug in Mojave. Have tried all the help articles and their suggestions to no avail.
According to that one poster it’s a HDD issue and my problem because I lack a SSD.
That's a different issue. Since the apparition of APFS (so since High Sierra), the OS is taking more time to boot because (from what I read) trim jobs are being done during the boot sequence no matter what, which slows down the whole process. Not all SSDs are affected for some reason. So it's not "slower", it's just doing more stuff than before during boot and it takes more time to do so. Could Apple have done things differently? Maybe but that's how it is. Mojave does the same, but I actually find it a little faster than High Sierra. Besides that, Mojave *is* faster than High Sierra, great upgrade so far.
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You have missed the entire point. I am complaining that Mojave is a little slower at rebooting and booting than Hi Sierra. This has NOTHING TO DO with a SSD or HD.
Well yes it probably does.