SD Card Reader SUPER Slow in 2021 M1Pro MBP 16"

After Monterey 12.2 installed - the problem was solved. My Respect and Thanks.

I had the same issue, but updating to osx 12.2 seems to have solved it as other have mentioned!

I just ran into this as well, and the issue was resolved after updating to MacOS 12.2.1. I'm not sure if it was the reboot, or the software update, which resolved the issue for me.

i bought the apple external sd to usb c card reader and it’s blazing on my MacBook Pro m1pro. With UHS-1 cards the internal card reader is so slow it’s unusable. I bought a new $200 uhs 2 card and it works in the internal card reader but still slower than the external card reading UHS 1. I’m going to take it into apple or exchange the m1pro.

I also have a problem with UHS-I cards.

I am a photographer and work a lot with 32 GB SD cards Sandisk Extreme, 32 GB, 90 MB/s) . I must have 20 of them, which I use rotating in my jobs. But the reader of my new Macbook Pro has a problem with these cards: copying processes are slow or faulty or break off in the middle (error -36). The Finder shows the spinning wheel.

On the other hand, I also have several UHS-II cards (Toshiba Experia Pro, 32 GB, 260 GB/s) that always work reliably and transfer the RAWS quickly to the computer.

UHS-I is officially supported by Apple, but de facto it is not the case for me. I can rule out defective cards as they all work fine in an external reader.

I also made a screen recording of the problem, which I'm happy to provide to Apple.

Best wishes, Christian

It would seem that all posts are omitting the software used to import the images. My experience is similar to everyone else's when I attempt to import images into Adobe Lightroom Classic (Version 11.1 Universal Application) Sometimes I get the window, sometimes I crash. Never get to import.

I attempted the import with Apples Photos app. same stack of images. They imported so fast that I didn't even realize it was done. (8 raw images taken with my dslr)

Just wanted to see if anyone's else slow issues are across the board in every app or just specific apps. Perhaps we need to be in Adobe's forums...

I too get nice performance on 12.2 with card that on 12.1had

Slow mounting.

Slow start of copying.

Error message in Finder.

Beach ball in Lightroom.

All fixed in 12.2

Have you checked if you’re on the latest version of macOS? I had the same problem but after updating it now works fine. They should be shipped with the latest version though as it’s not a good reflection on Apple.

Update to Monterey 12.2:

My problems seem to be solved as well :-)

Thank you for all the posts, ideas, thought

Greeting from Bremen

Best of luck.

12.2 has so far solved my problems (also using cards from Canon R).

I have all Sandisk SD Extreme Pro SD cards, some are 95MB/s others are 170MB/s. The 95MB/s cards are extremely slow indeed, except when you use an external card reader. The 170MB/s cards seem to work just fine with the internal reader. Surely this must be solvable with a software update, no?

Still very slow after upgrading to MacOS 12.1. The card is SanDisk 128GB Extreme PRO SDXC UHS-I Card (SDSDXXG-128G-GN4IN), formatted using Sony A7III camera.

The above card works fine on my early 2013 Retina MacBook Pro 15.

Another card that I have, Sony 128GB UHS-II card, works fine on the new M1 Pro 16".

Hi folks

Is there hope? I installed Monterey 12.2 yesterday and have just copied several UHS-I cards (which always gave me problems, unlike UHS-II, which always worked) into the card reader. I'm on card #10 right now, so far it's all worked flawlessly, no hangs in the finder, etc. This would not have worked before, I'm sure. Problem solved? That would be really nice!

Christian

12.2 fixed it for the most part for me. Still a little slow at times. My 2013 MacBook Pro worked much better...until the SD card hardware failed after ~7 years.