Extremely slow file transfer speeds on OS Ventura

Transfer speeds on OS Ventura are starting to make my Mac Studio unusable. Transferring 300GB from one external USB SSD drive to another is expected to take 2 days!? And that was after spending an hour stuck on "Preparing to Copy".


I'm not the only one either, see threads [1] [2] [3] [4] [5] [6].


Anyone experiencing this issue please report to https://apple.com/feedback or by using the Feedback Assistant app. The more data they have the quicker it will get fixed.


Mac Studio

Posted on Dec 4, 2022 11:50 PM

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Posted on Jan 23, 2023 10:14 PM

I had this issue with macOS 13.1 as well, however the macOS 13.2 update has fixed it for me today.


Benchmarks with Blackmagic Speedtest and a External Thunderbolt 3 enclosure with a Samsung 980 Pro 1TB:


macOS 12.x

Write - Read

2106MB/s - 2755MB/s


macOS 13.1

1186MB/s - 1675MB/s


macOS 13.2

2063MB/s - 2752MB/s


Improvements with my Samsung T7 SSD too.

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70 replies

Jan 22, 2023 9:32 PM in response to make-me-happy

No, ya que por cuestiones de trabajo no me era posible de momento pero me di cuenta luego luego tras la actualización ya que también tengo un dock Dell 6000 para 2 monitores mas y tras actualizar este ya no prende en automático tengo que desconectar y volver a conectar el cable de alimentación para que lo reconozca y es un problema muy molesto tener que estar haciendo eso. Sobre lo del tema que el internet afectaba la transferencia se me hizo algo ilógico ya que no tiene nada que ver con ello por eso también me di cuenta que no tenían idea de lo que pasaba.

Mar 13, 2023 4:11 PM in response to make-me-happy

What does the security content in the link you provided have to do with fixing the file system issues and write speed issues pertaining to internal and external drives? Nothing in the security notes states anything about fixing this issue, which I still have to this day. System-wide, it takes about 2 hours to transfer 20gb from local dmg to desktop on Ventura. I'm just going to be that person who says Ventura is the worst OS ever made.


Nov 11, 2023 4:30 PM in response to make-me-happy

I am having a very similar issue with Ventura copying of files. From one external SSD to another takes waaaaaay longer than molder MacBook Pro using Sonoma IOS. Is there a fix in the near future to resolve this or is there a way to turn off an internal virus protection software? Mine will copy at a normal speed then stop and think for quite a while then resume which results in an overall slow copying speed.

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Extremely slow file transfer speeds on OS Ventura

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