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Old Jan 9th, 2020, 01:06 PM   #1
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Exclamation Mojave - slow transfer speeds

Happy New Year! Starting the year off right with a random dilemma :-/ I recently installed Mojave (up from Sierra) on my 2012 Mac Mini and 2012 MBP. Everything seems to be working as expected except disk transfers. I just backed up a 1TB drive and it took 14 hours. I used to get speeds in excess of 300MB/s between SSDs and up to 150MB/s on mechanical drives. This is both with internal drives and external drives using USB 3 caddies (direct connection - no hub). But since installing Mojave, I now I consistently get 15-20MB/s for mechanical drives and not much better for SSDs. Read speeds for OS and applications seems good - but slows down to a crawl when it comes to copying files - either in the Finder or using software like CarbonCopyCloner. Even just duplicating a file in the OS Finder seems slow. Also, emptying the trash can be time consuming if a trashed folder contains lots of files - whether HFS+ or APFS. I have looked around the internet and did a search on ehMac and can't find much relevant info on this. If anyone has insight to offer that would be amazing. Thanks so much!

Mac OS 10.14.6
Mac Mini (late 2012) quad i7 2.3GHz
Mac Mini (mid 2012) quad i7 2.6GHz
both have 1TB Samsung 850 EVO system drive 30% free, APFS
external drives connected directly to USB3 (no hub)
Mechanical drives are HFS+, SSDs are APFS.
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Old Jan 13th, 2020, 01:52 PM   #2
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Well I've done a bit more testing and monitoring. I can get high transfer speeds with very large files but it is also kind of random. Copying a 14GB file between internal SSDs can go across at over 500MB/s in one direction. Copying it back to the original source drive though, it starts fast then slows to a crawl for the last half of the transfer. Folders of audio files which previously copied at lightening speed are now universally pretty slow. Folders with smaller files are worse. Still have not figured this one out! A bit frustrating... but normal operation of various DAWs etc is so far ok... playing audio and video no problem. Strange.
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Old Jan 14th, 2020, 08:09 AM   #3
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I would guess memory exhaustion; files that would once have been happy in the file cache aren't being cached in Mojave. What's your memory situation looking like in Activity Monitor when you do the copy?
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Old Jan 15th, 2020, 04:08 PM   #4
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Thanks polywog. Well, transfers seem to be improved today. Can get >500MB/s both ways on 14GB file. 4GB folder of audio files >300MB/s. So - not too bad - more like what I would expect. But a large folder of smaller docs is more like 30 to 100MB/s max. 50MB/s average. This is between internal SATA SSDs. I'm not sure what to look for in the memory tab of the Activity Monitor, but the "memory pressure" read out is constant and low throughout various transfers - same as at rest. Readouts in this window do not change when transfers begin or stop. Everything constant.
total memory: 16GB
used: 6.11GB
cached: 5.17GB

top memory users are: (no apps open except Activity Monitor)
Dropbox 400MB
AvidAppManHelper 230MB
Adobe Desktop Service 200MB (despite having de-installed, I thought, Adobe cloud) and then...
kernel_task 190MB
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