![]() High Sierra installed perfectly on my MBP on APFS.īefore installing the official Final non-Beta version of High Sierra on my iMac's Fusion drive, I followed Apple's instructions for Fusions, and converted my drive back to HFS+. My drives were converted to APFS in the process. I had run all the High Sierra betas on both machines with no trouble. I have an early 2011 MBP with an SSD, and a late 2013 iMac with 3Tb Fusion drive and 32Gb RAM. The lag time is not consistent but still a general sluggishness to file related activities. Little things like the initial launching of background apps on boot that used to literally happen within one or two seconds of boot are now taking upto a minute or so to complete. ![]() I will concur that at this point APFS is NOT a speed demon but I blame all the debug code still running in the beta. While I was pleased that the public beta conversion worked as advertised, I was expecting a disaster. I have the HDD running two partitions, one as part of the Fusion drive, the other as a sandbox partition formatted with HFS+. I have my SSD overprovisioned an additional 13% so as to have 20% of the 180GB unallocated (space to allow for wear leveling). I installed on my DIY Fusion drive running on a mid 2012, 15" non-retina, MBP with 16GB Ram and an INTEL 520 SSD / WD Black HDD (180GB/750GB). I used the inline APFS conversion during the public beta HS install without issues.
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