2014 MacBook Pro Retina - VERY SLOW USB 3.0 = cloning is now not possible

I have the exact same problem. However, I found that sometimes if I unplug the USB device and plug it in again, the problem just gone. I am also looking for a solution for this problem too.

Chiming in with the same problem, too.

Mid 2012 Macbook Pro Retina, slow usb 3 speeds on both a usb3 HD as well as my Sandisk Extreme USB thumbdrive

😟

Same issue as above. Connecting WD My Passport Ultra 1TB. Looked at Apple -> About This Mac -> System Report and confirmed drive is registering on USB 3.0 Superspeed Bus. Both Time Machine and newly created partitions are reporting 100MBps on read and writes, this should be more like 650MBps.

Anyone have any idea what is going on? Apple Experts Help Please! 😢

I have the exact same issue, I have a MBP Retina Display 2015 13'' a 2014 Retina 15'' both running Yosemite and a 2010 13'' running Mavericks, the 2010 is way faster than both my new mac, I just updated the 2010 to Yosemite, and it took 22 minutes to transfer a 4.2GB Movie to a USB, same USB when used on the same computer but with Mavericks, it used to take about a minute or two, its impossible to make big transfers to USB, I just got a Wireless USB from SanDisk, its a life saver in this situation.

I hope that with OS X El Capitan coming out, they fixed this issue.

Yes, I have same problem and it pains me that Apple do not sort issues out with their OS faster, they must know about them! I am sure they must use pen drives and so know about this!

It can take me 15 minutes to copy 1.5GB to a pen drive when it used to take less than a minute even on my old macbook.

I find a similar issue exists when emptying the trash when deleted files from a pen drive have been trashed only it is much slower to empty than to copy to!

I also had this problem on my rMBP 13.3 late 2013, but I am connecting with an ESATA to USB3.0 adapter this time.

In system report it is identified as USB3.0 device; however, my HDD cannot go over 40MB/s. Using this connector on other windows notebook can make R/W speed up to 100MB/s. I believe it is the compatible issue of apple hardware/driver (I have no time to install bootcamp Windows and test).

Same problem here! USB 3.0 harddrives extremely slow under El Capitan!

Has any one solved that problem? It makes me worry seeing post date of Striders which is now over year, and so far no solution I can find!

Thanks for sharing

Same problem here, i think this is since El Captain

I have the same problem with a new, mid-2015 Macbook Pro 15" running El Capitan. I have a PNY 32GB USB 3.0 device that runs fast OCCASIONALLY, and a Sandisk SDCZ60-016G that usually runs fast. With the PNY device, sometimes it takes close to 60 seconds for the device to mount (i.e., show up on the desktop), but most of the time it mounts quickly enough. The transfers are just extremely slow. I haven't noticed any correlation yet between how fast it mounts and the transfer speed. Also, I can't find the model number on the drive, or a picture around the internet, but it's still at Best Buy, and it comes in the same packaging as this one: http://www.amazon.com/PNY-Turbo-32GB-Flash-Drive/dp/B00FDUHD2K

Nevertheless, with the PNY device, when the transfer reports 5 hours to transfer 18GB of files and, it's actually faster for me to plug it into a late-2009 Mac Mini running El Capitan, that only has USB 2.0 ports, and then transfer them to my Macbook via a shared folder. This is kind of ridiculous.

To add to the above I'm transferring large video files, and the very first time I used the PNY device it took 3+ hours to transfer 6GB. To my great surprise, the Sandisk mentioned above did the same task in minutes. Then to my even greater surprise, the PNY device transferred large files in minutes ONE time. Since then, it's been slow, and prompted me to look into this. (I just purchased some faster Sandisk flash drives, so hopefully they will not be bogged down by whatever bug is causing this.)

I'm having the same slow speed issues with my Macbook Pro 13" retina, 2015, running El Capitan. It exists with external USB 3 drives, and USB 3 flash drives. Speed ranges from about 30 MB/s to at best 80 MB/s, with 50 MB/s being more typical with my two USB 3 drives. It used to be well over 100 MB/s. I was on the phone with Apple for an hour, doing various resets and trying things, and nothing worked. I'm going to take the computer in to an Apple Store. But I wonder if this is just an El Capitan problem.