Extremely slow file transfer speeds on OS Ventura

Ouch... that write speed is abysmal.

There does not seem to be anything obvious, but to further troubleshoot, you may try to run the same BlackMagic speed test while in Safe Mode. Does it show similar values?

And since we've already started with the personal attacks, I will add one more thing...

Probably the very worst thing you can do is assume that somewhere at Apple someone has seen this thread and has urgently dispatched software engineers to start working on a bug fix in Ventura. I can assure you that nothing of the sort has happened. It is extremely unlikely that anything of the sort will ever happen in the future.

If you sit on your hands, you will just get more and more frustrated. Like it or not, you are the one that is going to have to do the debugging on this. If you have data on externals that you can't erase, it will be your responsibility to copy that data somewhere else so that you can erase that drive and try a different format. If will be your responsibility to backup your computer, erase it, and try it again with a factory fresh installation.

I'm not saying this to be mean. I don't have the problem. Therefore, I can't help in any way.

You are free to keep using this thread for as long as you want. You can post whatever it is you want in it. You can demand Apple fix it. You can call me names. Whatever makes you feel best. Or you can get to work and start isolating the problem bit-by-bit. Only those people who have the problem can do this.

Yo tengo el mismo problema al comunicarme con Apple me pidieron hacer varias pruebas incluso probar en modo seguro y el problema continuo, como no se pudo resolver escalaron el problema y agendaron una llamada para apoyarme con el problema para lo cual me pidieron reinstalar el sistema operativo lo que se me hizo muy extremo ya que hay que hacer respaldos y uno necesita el equipo para trabajar. Cabe mencionar que incluso el primer asesor que me atendió por chat me dijo que inclusive podría ser por mi conexión a internet para lo cual se me hizo chistoso ya que no tiene nada que ver y en la llamada con el especialista me pidieron desactivar programas de inicio que solo tenía uno mismo que usaba antes de la ultima actualización y le comente y son muy tercos ya que les comente que eso lo note desde la ultima actualización ... en resumen me pidieron que reinstalara el os para lo cual veo que es cuestión de la actualización y en fin dudo que lo acepten.

En mi caso

Macbook Air M1 MacOs Ventura 13.1 4gb=1s

Macbook pro M2 MacOs Ventura 13.1 4gb=1min

Acabo de colgar con soporte de apple y lo que me dicen nuevamente ahora que vuela a reinstalar el OS pero esta vez borrando todo, para descartar un bug y que si el problema persiste que los vuelva a contactar para escalar el problema con un área especializada.

One other thing: does it make a difference if you connect these drives to the Thunderbolt ports on the back?

Have you installed and run any "cleaning", "optimizing", "speed-up", anti-virus or VPN apps on your Mac?

I have two different Samsung T7 SSD Drives. I have many different SD cards, UHS-II versions, UHS I versions, speeds up to 300mbs for the cards, and 1000mbs for the Samsung SSD. Immediately after updating to venture, file transfer slowed tremendously. Even moving stuff to the trash takes forever and emptying the trash does not work in one swoop.

Yes!

the speed of my T7 is feels even worst then what blackmagic says.

I also tried to talk with apple support by phone but they really didn't help and they wanted me to do stupid tests like format the drive ,I was certainly sured thats won't help.

its a bug of the macOS I really hope they will detect the problem and solve it for the next update.

its important to say that its only T7 problem and Sandisk works perfect.

Same ! I've been having issues with deleting files, opening archives, downloading files from the web as well as copying files, and especially folders. I can't even work properly anymore. I have to individually copy each file inside the root of the folder or subfolders manually before putting them back into folders. And that's when the files are small enough not to take forever to copy. Glad to see it's not an issue specific to my unit.

File copies over the network with Ventura are painfully slow. Files will take 30 seconds to start copying, and then at the end of the copy it hangs for about 3 minutes. Happening on a Mac Studio Pro and a Mac Pro M1 laptop. Other machines don't have this issue running Monterey.