So that then leads us to jumping back to Sierra to get back to HFS+. Which is what the Discord group noted the performance changed after upgrading to Mojave as the installer would in fact update the older HFS+ to APFS at that point no matter the older version! ![]() This has to do with the I/O limit of SATA III (6.0 Gb's) and the queue depth of the I/O channel.īoth High Sierra and Mojave use APFS and only if you've upgraded a HD will the older HFS+ file system not get upgraded with High Sierra from Sierra. But, I do agree APFS is not very good on a SATA or mSATA drive your system has. I would stick with Mojave as I can tell you its not any slower than High Sierra. But as the flash cache drive is not very large it doesn't take long to get bogged down. The next issue is Fusion Drive's are not very good if you want performance! They are good for fast boot ups or when you are constantly running the same code over and over. ![]() ![]() Performance issues won't be fixed by down grading the OS, Often with Hard Disks (spinning rust drive) the issue is file fragmentation.
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